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Giraffe

August 27, 2023

For other uses, see Giraffe (disambiguation).

The giraffe is a large African hoofed mammal belonging to the genus Giraffa. It is the tallest living terrestrial animal and the largest ruminant on Earth. Traditionally, giraffes were thought to be one species, Giraffa camelopardalis, with nine subspecies. Most recently, researchers proposed dividing them into up to eight extant species due to new research into their mitochondrial and nuclear DNA, as well as morphological measurements. Seven other extinct species of Giraffa are known from the fossil record.

Giraffe
Temporal range: 11.61–0 Ma Miocene to Recent
Masai giraffe (G. c. tippelskirchi) in Mikumi National Park, Tanzania

Vulnerable (IUCN 3.1)[1] (As the species complex)
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Family: Giraffidae
Genus: Giraffa
Linnaeus, 1758
Species:
G. camelopardalis
Binomial name
Giraffa camelopardalis
Linnaeus, 1758
Species

See taxonomy

Distribution of the giraffe

The giraffe's chief distinguishing characteristics are its extremely long neck and legs, its horn-like ossicones, and its spotted coat patterns. It is classified under the family Giraffidae, along with its closest extant relative, the okapi. Its scattered range extends from Chad in the north to South Africa in the south, and from Niger in the west to Somalia in the east. Giraffes usually inhabit savannahs and woodlands. Their food source is leaves, fruits, and flowers of woody plants, primarily acacia species, which they browse at heights most other herbivores cannot reach.

Lions, leopards, spotted hyenas, and African wild dogs may prey upon giraffes. Giraffes live in herds of related females and their offspring or bachelor herds of unrelated adult males, but are gregarious and may gather in large aggregations. Males establish social hierarchies through "necking", combat bouts where the neck is used as a weapon. Dominant males gain mating access to females, which bear sole responsibility for rearing the young.

The giraffe has intrigued various ancient and modern cultures for its peculiar appearance, and has often been featured in paintings, books, and cartoons. It is classified by the International Union for Conservation of Nature (IUCN) as vulnerable to extinction and has been extirpated from many parts of its former range. Giraffes are still found in numerous national parks and game reserves, but estimates as of 2016 indicate there are approximately 97,500 members of Giraffa in the wild. More than 1,600 were kept in zoos in 2010.

Etymology

The name "giraffe" has its earliest known origins in the Arabic word zarāfah (زرافة),[2] ultimately from Persian زُرنَاپَا‎ (zurnāpā), a compound of زُرنَا‎ (zurnā, “flute, zurna”) and پَا‎ (pā, “leg”).[3][4] In early Modern English the spellings jarraf and ziraph were used, probably directly from the Arabic,[5] and in Middle English jarraf and ziraph, gerfauntz. The Italian form giraffa arose in the 1590s. The modern English form developed around 1600 from the French girafe.[2]

"Camelopard" /kəˈmɛləˌpɑːrd/ is an archaic English name for the giraffe; it derives from the Ancient Greek καμηλοπάρδαλις (kamēlopárdalis), from κάμηλος (kámēlos), "camel", and πάρδαλις (párdalis), "leopard", referring to its camel-like shape and leopard-like colouration.[6][7]

Taxonomy

Evolution

The giraffe is one of only two living genera of the family Giraffidae in the order Artiodactyla, the other being the okapi.[8] They are ruminants of the clade Pecora, along with Antilocapridae (pronghorns), Cervidae (deer), Bovidae (cattle, antelope, goats and sheep) and Moschidae (musk deer). A 2019 genome study (cladogram below) finds that Giraffidae are a sister taxon to Antilocapridae, with an estimated split of over 20 million years ago.[9]

The family Giraffidae was once much more extensive, with over 10 fossil genera described.[8] The elongation of the neck appears to have started early in the giraffe lineage. Comparisons between giraffes and their ancient relatives suggest vertebrae close to the skull lengthened earlier, followed by lengthening of vertebrae further down.[10] One early giraffid ancestor was Canthumeryx, which has been dated variously to have lived 25–20 mya, 17–15 mya or 18–14.3 mya and whose deposits have been found in Libya. This animal resembled an antelope and had a medium-sized, lightly built body. Giraffokeryx appeared 15–12 mya on the Indian subcontinent and resembled an okapi or a small giraffe, and had a longer neck and similar ossicones.[8] Giraffokeryx may have shared a clade with more massively built giraffids like Sivatherium and Bramatherium.[10]

 
The extinct giraffid Samotherium (middle) in comparison with the okapi (below) and giraffe. The anatomy of Samotherium appears to have shown a transition to a giraffe-like neck.[11]

Giraffids like Palaeotragus, Shansitherium and Samotherium appeared 14 mya and lived throughout Africa and Eurasia. These animals had broader skulls with reduced frontal cavities.[8][10] Paleotragus resembled the okapi and may have been its ancestor.[8] Others find that the okapi lineage diverged earlier, before Giraffokeryx.[10] Samotherium was a particularly important transitional fossil in the giraffe lineage, as the length and structure of its cervical vertebrae were between those of a modern giraffe and an okapi, and its neck posture was likely similar to the former's.[11] Bohlinia, which first appeared in southeastern Europe and lived 9–7 mya, was likely a direct ancestor of the giraffe. Bohlinia closely resembled modern giraffes, having a long neck and legs and similar ossicones and dentition.[8]

Bohlinia colonised China and northern India and produced the Giraffa, which, around 7 mya, reached Africa. Climate changes led to the extinction of the Asian giraffes, while the African giraffes survived and radiated into new species. Living giraffes appear to have arisen around 1 mya in eastern Africa during the Pleistocene.[8] Some biologists suggest the modern giraffes descended from G. jumae;[12] others find G. gracilis a more likely candidate. G. jumae was larger and more robust, while G. gracilis was smaller and more slender.[8]

The changes from extensive forests to more open habitats, which began 8 mya, are believed to be the main driver for the evolution of giraffes.[8] During this time, tropical plants disappeared and were replaced by arid C4 plants, and a dry savannah emerged across eastern and northern Africa and western India.[13][14] Some researchers have hypothesised that this new habitat, coupled with a different diet, including acacia species, may have exposed giraffe ancestors to toxins that caused higher mutation rates and a higher rate of evolution.[15] The coat patterns of modern giraffes may also have coincided with these habitat changes. Asian giraffes are hypothesised to have had more okapi-like colourations.[8]

The giraffe genome is around 2.9 billion base pairs in length, compared to the 3.3 billion base pairs of the okapi. Of the proteins in giraffe and okapi genes, 19.4% are identical. The divergence of giraffe and okapi lineages dates to around 11.5 mya. A small group of regulatory genes in the giraffe appear to be responsible for the animal's height and associated circulatory adaptations.[16][17]

Species and subspecies

 
Map showing "Approximate geographic ranges, fur patterns, and phylogenetic relationships between some giraffe subspecies based on mitochondrial DNA sequences. Colored dots on the map represent sampling localities. The phylogenetic tree is a maximum-likelihood phylogram based on samples from 266 giraffes. Asterisks along branches correspond to node values of more than 90% bootstrap support. Stars at branch tips identify paraphyletic haplotypes found in Maasai and reticulated giraffes".[18]

The International Union for Conservation of Nature (IUCN) currently recognises only one species of giraffe with nine subspecies.[1]

Carl Linnaeus originally classified living giraffes as one species in 1758. He gave it the binomial name Cervus camelopardalis. Mathurin Jacques Brisson coined the generic name Giraffa in 1762.[19] During the 1900s, various taxonomies with two or three species were proposed.[20] A 2007 study on the genetics of giraffes using mitochondrial DNA suggested at least six lineages could be recognised as species.[18] A 2011 study using detailed analyses of the morphology of giraffes, and application of the phylogenetic species concept, described eight species of living giraffes.[21] A 2016 study also concluded that living giraffes consist of multiple species. The researchers suggested the existence of four species, which have not exchanged genetic information between each other for 1 to 2 million years.[22]

A 2020 study showed that depending on the method chosen, different taxonomic hypotheses recognizing from two to six species can be considered for the genus Giraffa.[23] That study also found that multi-species coalescent methods can lead to taxonomic over-splitting, as those methods delimit geographic structures rather than species. The three-species hypothesis, which recognises G. camelopardalis, G. giraffa, and G. tippelskirchi, is highly supported by phylogenetic analyses and also corroborated by most population genetic and multi-species coalescent analyses.[23] A 2021 whole genome sequencing study suggests the existence of four distinct species and seven subspecies.[24]

The cladogram below shows the phylogenetic relationship between the four proposed species and seven subspecies based on the genome analysis.[24] Note the eight lineages correspond to eight of the traditional subspecies in the one species hypothesis. The Rothschild giraffe is subsumed into G. camelopardalis camelopardalis.

Giraffa
Giraffa camelopardalis

G. camelopardalis antiquorum (Kordofan giraffe)

G. c. camelopardalis (Nubian giraffe)

G. c. peralta (West African giraffe)

(northern giraffe)
G. reticulata

(no subspecies)

(reticulated giraffe)
G. tippelskirchi

G. tippelskirchi tippelskirchi (Masai giraffe sensu stricto)

G. t. thornicrofti (Luangwa or Thornicroft's giraffe)

(Masai giraffe sensu lato)
G. giraffa

G. giraffa angolensis (Angolan giraffe)

G. g. giraffa (South African giraffe)

(southern giraffe)


The following table compares the different hypotheses for giraffe species. The description column shows the traditional nine subspecies in the one species hypothesis.[1][25]

Species and subspecies of giraffe
Description Image Eight species taxonomy[21] Four species taxonomy[22][24] Three species taxonomy[23]
The Kordofan giraffe (G. c. antiquorum) has a distribution which includes southern Chad, the Central African Republic, northern Cameroon, and the northeastern DR Congo.[1] Populations in Cameroon were formerly included in G. c. peralta, but this was incorrect.[26] Compared to the Nubian giraffe, this subspecies has smaller and more irregular spotting patterns. Its spots may be found below the hocks and the insides of the legs. A median lump is present in males.[27]: 51–52  Some 2,000 are believed to remain in the wild.[1] Considerable confusion has existed over the status of this subspecies and G. c. peralta in zoos. In 2007, all alleged G. c. peralta in European zoos were shown to be, in fact, G. c. antiquorum.[26] With this correction, about 65 are living in zoos.[28]   Kordofan giraffe
(G. antiquorum)[29]		 Northern giraffe
(G. camelopardalis)
Three or four subspecies:
  • G. c. antiquorum
  • G. c. camelopardalis
  • G. c. peralta
  • G. c. reticulata (only in three-species hypothesis)
The Nubian giraffe (G. c. camelopardalis), is found in eastern South Sudan and southwestern Ethiopia, in addition to Kenya and Uganda.[1] It has sharply defined chestnut-coloured spots surrounded by mostly white lines, while undersides lack spotting.[30] The median lump is particularly developed in the male.[27]: 51  Around 2,150 are thought to remain in the wild, with another 1,500 individuals belonging to the Rothschild's ecotype.[1] With the addition of Rothschild's giraffe to the Nubian subspecies, the Nubian giraffe is very common in captivity, although the original phenotype is rare — a group is kept at Al Ain Zoo in the United Arab Emirates.[31] In 2003, this group numbered 14.[32]   Nubian giraffe
(G. camelopardalis)[25]

Also known as Baringo giraffe or Ugandan giraffe

Two subspecies:
  • G. c. camelopardalis
  • G. c. rothschildi (Rothschild's giraffe)
Rothschild's giraffe (G. c. rothschildi) may be an ecotype of G. camelopardalis. Its range includes parts of Uganda and Kenya.[1] Its presence in South Sudan is uncertain.[33] This giraffe has large dark patches that usually have complete margins, but may also have sharp edges. The dark spots may also have paler radiating lines or streaks within them. Spotting rarely reaches below the hocks and almost never to the hooves. This ecotype may also develop five "horns".[27]: 53  Around 1,500 individuals believed to remain in the wild,[1] and more than 450 are living in zoos.[28] According to genetic analysis circa September 2016, it is conspecific with the Nubian giraffe (G. c. camelopardalis).[22]  
The West African giraffe (G. c. peralta) is endemic to southwestern Niger.[1] This animal has a lighter pelage (fur) than other subspecies,[34]: 322  with red lobe-shaped blotches that reach below the hocks. The ossicones are more erect than in other subspecies and males have well-developed median lumps.[27]: 52–53  It is the most endangered subspecies within Giraffa, with 400 individuals remaining in the wild.[1] Giraffes in Cameroon were formerly believed to belong to this species, but are actually G. c. antiquorum. This error resulted in some confusion over its status in zoos, but in 2007, it was established that all "G. c. peralta" kept in European zoos are actually G. c. antiquorum. The same 2007 study found that the West African giraffe was more closely related to Rothschild's giraffe than the Kordofan, and its ancestor may have migrated from eastern to northern Africa and then west as the Sahara Desert spread. At its largest, Lake Chad may have acted as a boundary between the West African and Kordofan giraffes during the Holocene (before 5000 BC).[26]   West African giraffe
(G. peralta),[35]

Also known as Niger giraffe or Nigerian giraffe

The reticulated giraffe (G. c. reticulata) is native to northeastern Kenya, southern Ethiopia, and Somalia.[1] Its distinctive coat pattern consists of sharp-edged, reddish-brown polygonal patches divided by a network of thin white lines. Spots may or may not extend below the hocks, and a median lump is present in males.[27]: 53  An estimated 8,660 individuals remain in the wild,[1] and based on International Species Information System records, more than 450 are living in zoos.[28]   Reticulated giraffe
(G. reticulata),[36]

Also known as Somali giraffe

The Angolan giraffe (G. c. angolensis)[37] is found in northern Namibia, southwestern Zambia, central Botswana, western Zimbabwe, southern Zimbabwe and, since mid-2023 again in Angola.[38][1][39][40] A 2009 genetic study on this subspecies suggested the northern Namib Desert and Etosha National Park populations form a separate subspecies.[41] This subspecies has large brown blotches with notched edges or angular extensions. The spotting pattern extends throughout the legs but not the upper part of the face. The neck and rump patches tend to be fairly small. The subspecies also has a white ear patch.[27]: 51  About 13,000 animals are estimated to remain in the wild,[1] and about 20 are living in zoos.[28]   Angolan giraffe
(G. angolensis)

Also known as Namibian giraffe

Southern giraffe (G. giraffa)
Two subspecies:
  • G. g. angolensis
  • G. g. giraffa
The South African giraffe (G. c. giraffa) is found in northern South Africa, southern Botswana, northern Botswana and southwestern Mozambique.[1][39][40] It has dark, somewhat rounded patches "with some fine projections" on a tawny background colour. The spots extend down the legs, growing smaller as they do. The median lump of males is poorly developed.[27]: 52  A maximum of 31,500 are estimated to remain in the wild,[1] and around 45 are living in zoos.[28]   South African giraffe
(G. giraffa)[42]

Also known as Cape giraffe

The Masai giraffe (G. c. tippelskirchi) can be found in central and southern Kenya and in Tanzania.[1] Its coat patterns are highly diverse, with spots ranging from mostly rounded and smooth edged to oval shaped and incised or loped edged.[43] A median lump is usually present in males.[27]: 54 [44] A total of 32,550 are thought to remain in the wild,[1] and about 100 are living in zoos.[28]   Masai giraffe
(G. tippelskirchi)[37]

Also known as Kilimanjaro giraffe

Masai giraffe (G. tippelskirchi)
Two subspecies:
  • G. t. tippelskirchi
  • G. t. thornicrofti
Thornicroft's giraffe (G. c. thornicrofti) is restricted to the Luangwa Valley in eastern Zambia.[1] The patches are notched and somewhat star-shaped, and may or may not extend across the legs. The median lump of males is underdeveloped.[27]: 54  No more than 550 remain in the wild,[1] with none in zoos.[28] It was named after Harry Scott Thornicroft.[37]   Thornicroft's giraffe
("G. thornicrofti")

Also known as Luangwa giraffe or Rhodesian giraffe

The first extinct species to be described was Giraffa sivalensis Falconer and Cautley 1843, a reevaluation of a vertebra that was initially described as a fossil of the living giraffe.[45] While taxonomic opinion may be lacking on some names, the extinct species that have been published include:[46]

Characteristics

 
Giraffe skeleton on display at the Museum of Osteology, Oklahoma City, Oklahoma

Fully grown giraffes stand 4.3–5.7 m (14–19 ft) tall, with males taller than females.[47] The average weight is 1,192 kg (2,628 lb) for an adult male and 828 kg (1,825 lb) for an adult female.[48] Despite its long neck and legs, its body is relatively short.[49]: 66  The skin is mostly gray,[48] or tan,[50] and can reach a thickness of 20 mm (0.79 in).[51]: 87  The 80–100 cm (31–39 in) long[37] tail ends in a long, dark tuft of hair and is used as a defense against insects.[51]: 94 

The coat has dark blotches or patches, which can be orange, chestnut, brown, or nearly black, surrounded by light hair, usually white or cream coloured.[52] Male giraffes become darker as they grow old.[44] The coat pattern has been claimed to serve as camouflage in the light and shade patterns of savannah woodlands.[37] When standing among trees and bushes, they are hard to see at even a few metres distance. However, adult giraffes move about to gain the best view of an approaching predator, relying on their size and ability to defend themselves rather than on camouflage, which may be more important for calves.[8] Each giraffe has a unique coat pattern.[53][54] Calves inherit some coat pattern traits from their mothers, and variation in some spot traits is correlated with calf survival.[43] The skin under the blotches may regulate the animal's body temperature, being sites for complex blood vessel systems and large sweat glands.[55]

The fur may give the animal chemical defense, as its parasite repellents give it a characteristic scent. At least 11 main aromatic chemicals are in the fur, although indole and 3-methylindole are responsible for most of the smell. Because males have a stronger odour than females, it may also have a sexual function.[56]

Head

 
Closeup of the head of a northern giraffe

Both sexes have prominent horn-like structures called ossicones, which can reach 13.5 cm (5.3 in). They are formed from ossified cartilage, covered in skin and fused to the skull at the parietal bones.[44][51]: 95–97  Being vascularised, the ossicones may have a role in thermoregulation,[55] and are used in combat between males.[57] Appearance is a reliable guide to the sex or age of a giraffe: the ossicones of females and young are thin and display tufts of hair on top, whereas those of adult males tend to be bald and knobbed on top.[44] A lump, which is more prominent in males, emerges in the middle of the skull.[19] Males develop calcium deposits that form bumps on their skulls as they age.[52] Multiple sinuses lighten a giraffe's skull.[51]: 103  However, as males age, their skulls become heavier and more club-like, helping them become more dominant in combat.[44] The occipital condyles at the bottom of the skull allow the animal to tip its head over 90 degrees and grab food on the branches directly above them with the tongue.[51]: 103, 110 [19]

With eyes located on the sides of the head, the giraffe has a broad visual field from its great height.[51]: 85, 102  Compared to other ungulates, giraffe vision is more binocular and the eyes are larger with a greater retinal surface area.[58] Giraffes may see in colour[51]: 85  and their senses of hearing and smell are sharp.[52] The ears are movable[51]: 95  and the nostrils are slit-shaped, possibly to withstand blowing sand.[59] The giraffe's tongue is about 45 cm (18 in) long. It is black, perhaps to protect against sunburn, and can grasp foliage and delicately pick off leaves.[51]: 109–110  The upper lip is flexible and hairy to protect against sharp prickles.[19] The upper jaw has a hard palate instead of front teeth. The molars and premolars are wide with low crowns on the surface.[51]: 106 

Neck

The giraffe has an extremely elongated neck, which can be up to 2.4 m (7 ft 10 in) in length.[60] Along the neck is a mane made of short, erect hairs.[19] The neck typically rests at an angle of 50–60 degrees, though juveniles are closer to 70 degrees.[51]: 72–73  The long neck results from a disproportionate lengthening of the cervical vertebrae, not from the addition of more vertebrae. Each cervical vertebra is over 28 cm (11 in) long.[49]: 71  They comprise 52–54 per cent of the length of the giraffe's vertebral column, compared with the 27–33 percent typical of similar large ungulates, including the giraffe's closest living relative, the okapi.[15] This elongation largely takes place after birth, perhaps because giraffe mothers would have a difficult time giving birth to young with the same neck proportions as adults.[61] The giraffe's head and neck are held up by large muscles and a nuchal ligament, which are anchored by long thoracic vertebrae spines, giving them a hump.[19][62][37]

 
Adult male reticulated giraffe feeding high on an acacia, in Kenya

The giraffe's neck vertebrae have ball and socket joints.[49]: 71  The point of articulation between the cervical and thoracic vertebrae of giraffes is shifted to lie between the first and second thoracic vertebrae (T1 and T2), unlike in most other ruminants, where the articulation is between the seventh cervical vertebra (C7) and T1.[15][61] This allows C7 to contribute directly to increased neck length and has given rise to the suggestion that T1 is actually C8, and that giraffes have added an extra cervical vertebra.[62] However, this proposition is not generally accepted, as T1 has other morphological features, such as an articulating rib, deemed diagnostic of thoracic vertebrae, and because exceptions to the mammalian limit of seven cervical vertebrae are generally characterised by increased neurological anomalies and maladies.[15]

There are several hypotheses regarding the evolutionary origin and maintenance of elongation in giraffe necks.[57] Charles Darwin originally suggested the "competing browsers hypothesis", which has been challenged only recently. It suggests that competitive pressure from smaller browsers, like kudu, steenbok and impala, encouraged the elongation of the neck, as it enabled giraffes to reach food that competitors could not. This advantage is real, as giraffes can and do feed up to 4.5 m (15 ft) high, while even quite large competitors, such as kudu, can feed up to only about 2 m (6 ft 7 in) high.[63] There is also research suggesting that browsing competition is intense at lower levels, and giraffes feed more efficiently (gaining more leaf biomass with each mouthful) high in the canopy.[64][65] However, scientists disagree about just how much time giraffes spend feeding at levels beyond the reach of other browsers,[12][57][63][66] and a 2010 study found that adult giraffes with longer necks actually suffered higher mortality rates under drought conditions than their shorter-necked counterparts. This study suggests that maintaining a longer neck requires more nutrients, which puts longer-necked giraffes at risk during a food shortage.[67]

Another theory, the sexual selection hypothesis, proposes the long necks evolved as a secondary sexual characteristic, giving males an advantage in "necking" contests (see below) to establish dominance and obtain access to sexually receptive females.[12] In support of this theory, necks are longer and heavier for males than females of the same age,[12][57] and males do not employ other forms of combat.[12] However, one objection is it fails to explain why female giraffes also have long necks.[68] It has also been proposed that the neck serves to give the animal greater vigilance.[69][70]

Legs, locomotion and posture

 
Right hind leg of a Masai giraffe at San Diego Zoo

A giraffe's front and back legs are about the same length. The radius and ulna of the front legs are articulated by the carpus, which, while structurally equivalent to the human wrist, functions as a knee.[71] It appears that a suspensory ligament allows the lanky legs to support the animal's great weight.[72] The hooves of large male giraffes reach 31 cm × 23 cm (12.2 in × 9.1 in) in diameter.[51]: 98  The fetlock of the leg is low to the ground, allowing the hoof to better support the animal's weight. Giraffes lack dewclaws and interdigital glands. While the pelvis is relatively short, the ilium has stretched out crests.[19]

A giraffe has only two gaits: walking and galloping. Walking is done by moving the legs on one side of the body, then doing the same on the other side.[44] When galloping, the hind legs move around the front legs before the latter move forward,[52] and the tail will curl up.[44] The movements of the head and neck provide balance and control momentum while galloping.[34]: 327–29  The giraffe can reach a sprint speed of up to 60 km/h (37 mph),[73] and can sustain 50 km/h (31 mph) for several kilometres.[74] Giraffes would probably not be competent swimmers as their long legs would be highly cumbersome in the water,[75] although they might be able to float.[76] When swimming, the thorax would be weighed down by the front legs, making it difficult for the animal to move its neck and legs in harmony[75][76] or keep its head above the water's surface.[75]

A giraffe rests by lying with its body on top of its folded legs.[34]: 329  To lie down, the animal kneels on its front legs and then lowers the rest of its body. To get back up, it first gets on its front knees and positions its backside on top of its hindlegs. It then pulls up the backside upwards and the front legs stand straight up again. At each stage, the animal swings its head for balance.[51]: 67  If the giraffe wants to reach down to drink, it either spreads its front legs or bends its knees.[44] Studies in captivity found the giraffe sleeps intermittently around 4.6 hours per day, mostly at night. It usually sleeps lying down; however, standing sleeps have been recorded, particularly in older individuals. Intermittent short "deep sleep" phases while lying are characterised by the giraffe bending its neck backwards and resting its head on the hip or thigh, a position believed to indicate paradoxical sleep.[77]

Internal systems

 
Scheme of path of the recurrent laryngeal nerve in giraffe

In mammals, the left recurrent laryngeal nerve is longer than the right; in the giraffe, it is over 30 cm (12 in) longer. These nerves are longer in the giraffe than in any other living animal;[78] the left nerve is over 2 m (6 ft 7 in) long.[79] Each nerve cell in this path begins in the brainstem and passes down the neck along the vagus nerve, then branches off into the recurrent laryngeal nerve which passes back up the neck to the larynx. Thus, these nerve cells have a length of nearly 5 m (16 ft) in the largest giraffes.[78] Despite its long neck and large skull, the brain of the giraffe is typical for an ungulate.[80] Evaporative heat loss in the nasal passages keep the giraffe's brain cool.[55] The shape of the skeleton gives the giraffe a small lung volume relative to its mass. Its long neck gives it a large amount of dead space, in spite of its narrow windpipe. The giraffe also has a high tidal volume so the balance of dead space and tidal volume is much the same as other mammals. The animal can still provide enough oxygen for its tissues, and it can increase its respiratory rate and oxygen diffusion when running.[81]

 
Reticulated giraffe bending down to drink in Kenya. The circulatory system is adapted to deal with blood flow rushing down its neck.

The giraffe's circulatory system has several adaptations to compensate for its great height.[16] Its 11 kg (25 lb) and 60 cm (2 ft) heart must generate approximately double the blood pressure required for a human to maintain blood flow to the brain. As such, the wall of the heart can be as thick as 7.5 cm (3.0 in).[52] Giraffes have relatively high heart rates for their size, at 150 beats per minute.[49]: 76  When the animal lowers its head, the blood rushes down fairly unopposed and a rete mirabile in the upper neck, with its large cross-sectional area, prevents excess blood flow to the brain. When it raises again, the blood vessels constrict and push blood into the brain so the animal does not faint.[82] The jugular veins contain several (most commonly seven) valves to prevent blood flowing back into the head from the inferior vena cava and right atrium while the head is lowered.[83] Conversely, the blood vessels in the lower legs are under great pressure because of the weight of fluid pressing down on them. To solve this problem, the skin of the lower legs is thick and tight, preventing too much blood from pouring into them.[37]

Giraffes have oesophageal muscles that are strong enough to allow regurgitation of food from the stomach up the neck and into the mouth for rumination.[49]: 78  They have four chambered stomachs, which are adapted to their specialized diet.[19] The intestines of an adult giraffe measure more than 70 m (230 ft) in length and have a relatively small ratio of small to large intestine.[84] The giraffe has a small, compact liver.[49]: 76  In fetuses there may be a small gallbladder that vanishes before birth.[19][85][86]

Behaviour and ecology

Habitat and feeding

 
A Masai giraffe extending its tongue to feed, in Tanzania. Its tongue, lips and palate are tough enough to deal with sharp thorns in trees.

Giraffes usually inhabit savannahs and open woodlands. They prefer areas dominated by Acacieae, Commiphora, Combretum and Terminalia tree over Brachystegia which are more densely spaced.[34]: 322  The Angolan giraffe can be found in desert environments.[87] Giraffes browse on the twigs of trees, preferring those of the subfamily Acacieae and the genera Commiphora and Terminalia,[88] which are important sources of calcium and protein to sustain the giraffe's growth rate.[8] They also feed on shrubs, grass and fruit.[34]: 324  A giraffe eats around 34 kg (75 lb) of plant matter daily.[44] When stressed, giraffes may chew on large branches, stripping them of bark.[34]: 325  Giraffes are also recorded to chew old bones.[51]: 102 

During the wet season, food is abundant and giraffes are more spread out, while during the dry season, they gather around the remaining evergreen trees and bushes.[88] Mothers tend to feed in open areas, presumably to make it easier to detect predators, although this may reduce their feeding efficiency.[66] As a ruminant, the giraffe first chews its food, then swallows it for processing and then visibly passes the half-digested cud up the neck and back into the mouth to chew again.[49]: 78–79  The giraffe requires less food than many other herbivores because the foliage it eats has more concentrated nutrients and it has a more efficient digestive system.[88] The animal's faeces come in the form of small pellets.[19] When it has access to water, a giraffe will go no more than three days without drinking.[44]

Giraffes have a great effect on the trees that they feed on, delaying the growth of young trees for some years and giving "waistlines" to too tall trees. Feeding is at its highest during the first and last hours of daytime. Between these hours, giraffes mostly stand and ruminate. Rumination is the dominant activity during the night, when it is mostly done lying down.[44]

Social life

 
Gathering of female South African giraffes in Tswalu Kalahari Reserve, South Africa. These animals commonly gather in herds.

Giraffes are usually found in groups that vary in size and composition according to ecological, anthropogenic, temporal, and social factors.[89] Traditionally, the composition of these groups had been described as open and ever-changing.[90] For research purposes, a "group" has been defined as "a collection of individuals that are less than a kilometre apart and moving in the same general direction".[91] More recent studies have found that giraffes have long lasting social groups or cliques based on kinship, sex or other factors, and these groups regularly associate with other groups in larger communities or sub-communities within a fission–fusion society.[92][93][94][95] Proximity to humans can disrupt social arrangements.[92] Masai giraffes in Tanzania sort themselves into different subpopulations of 60–90 adult females with overlapping ranges, each of which differ in reproductive rates and calf mortality.[96] Dispersal is male biased, and can include spatial and/or social dispersal.[97] Adult female subpopulations are connected by males into supercommunities of around 300 animals.[98]

 
Giraffe hum
Giraffe hum, ogg/Vorbis format.
Giraffe snort
Giraffe snort ogg/Vorbis format.
Giraffe grunt
Giraffe grunt ogg/Vorbis format.
Giraffe bursts
Giraffe bursts ogg/Vorbis format
Problems playing these files? See media help.

The number of giraffes in a group can range from one up to 66 individuals.[89][95] Giraffe groups tend to be sex-segregated[95] although mixed-sex groups made of adult females and young males also occur.[91] Female groups may be matrilineally related.[95] Generally females are more selective than males in who they associate with regarding individuals of the same sex.[94] Particularly stable giraffe groups are those made of mothers and their young,[91] which can last weeks or months.[99] Young males also form groups and will engage in playfights. However, as they get older, males become more solitary but may also associate in pairs or with female groups.[95][99] Giraffes are not territorial,[19] but they have home ranges that vary according to rainfall and proximity to human settlements.[100] Male giraffes occasionally roam far from areas that they normally frequent.[34]: 329 

Early biologists suggested giraffes were mute and unable to create enough air flow to vibrate their vocal folds.[101] To the contrary; they have been recorded to communicate using snorts, sneezes, coughs, snores, hisses, bursts, moans, grunts, growls and flute-like sounds.[44][101] During courtship, males emit loud coughs. Females call their young by bellowing. Calves will emit bleats, mooing and mewing sounds.[44] Snorting and hissing is associated with vigilance.[102] During nighttime, giraffes appear to hum to each other.[103] There is some evidence that giraffes use Helmholtz resonance to create infrasound.[104] They also communicate with body language. Dominant males display to other males with an erect posture; holding the chin and head up while walking stiffly and displaying their side. The less dominant show submissiveness by dropping the head and ears, lowering the chin and fleeing.[44]

Reproduction and parental care

 
Angolan giraffes mating in Namibia

Reproduction in giraffes is broadly polygamous: a few older males mate with the fertile females.[91] Females can reproduce throughout the year and experience oestrus cycling approximately every 15 days.[105][106] Female giraffes in oestrous are dispersed over space and time, so reproductive adult males adopt a strategy of roaming among female groups to seek mating opportunities, with periodic hormone-induced rutting behaviour approximately every two weeks.[107] Males prefer young adult females over juveniles and older adults.[91]

Male giraffes assess female fertility by tasting the female's urine to detect oestrus, in a multi-step process known as the flehmen response.[91][99] Once an oestrous female is detected, the male will attempt to court her. When courting, dominant males will keep subordinate ones at bay.[99] A courting male may lick a female's tail, lay his head and neck on her body or nudge her with his ossicones. During copulation, the male stands on his hind legs with his head held up and his front legs resting on the female's sides.[44]

Giraffe gestation lasts 400–460 days, after which a single calf is normally born, although twins occur on rare occasions.[105] The mother gives birth standing up. The calf emerges head and front legs first, having broken through the fetal membranes, and falls to the ground, severing the umbilical cord.[19] A newborn giraffe is 1.7–2 m (5.6–6.6 ft) tall.[47] Within a few hours of birth, the calf can run around and is almost indistinguishable from a one-week-old. However, for the first one to three weeks, it spends most of its time hiding,[108] its coat pattern providing camouflage. The ossicones, which have lain flat in the womb, raise up in a few days.[44]

 
Female Angolan giraffe with calf

Mothers with calves will gather in nursery herds, moving or browsing together. Mothers in such a group may sometimes leave their calves with one female while they forage and drink elsewhere. This is known as a "calving pool".[108] Calves are at risk of predation, and a mother giraffe will stand over them and kick at an approaching predator.[44] Females watching calving pools will only alert their own young if they detect a disturbance, although the others will take notice and follow.[108] Allo-sucking, where a calf will suckle a female other than its mother, has been recorded in both wild and captive giraffes.[109][110] Calves first ruminate at four to six months and stop nursing at six to eight months. Young may not reach independence until they are 14 months old.[51]: 49  Females become sexually mature when they are four years old, while males become mature at four or five years. Spermatogenesis in male giraffes begins at three to four years of age.[111] Males must wait until they are at least seven years old to gain the opportunity to mate.[44]

Necking

 
Here, male South African giraffes engage in low intensity necking to establish dominance, in Ithala Game Reserve, Kwa-Zulu-Natal, South Africa.

Male giraffes use their necks as weapons in combat, a behaviour known as "necking". Necking is used to establish dominance and males that win necking bouts have greater reproductive success.[12] This behaviour occurs at low or high intensity. In low-intensity necking, the combatants rub and lean on each other. The male that can keep itself more upright wins the bout. In high-intensity necking, the combatants will spread their front legs and swing their necks at each other, attempting to land blows with their ossicones. The contestants will try to dodge each other's blows and then prepare to counter. The power of a blow depends on the weight of the skull and the arc of the swing.[44] A necking duel can last more than half an hour, depending on how well matched the combatants are.[34]: 331  Although most fights do not lead to serious injury, there have been records of broken jaws, broken necks, and even deaths.[12]

After a duel, it is common for two male giraffes to caress and court each other. Such interactions between males have been found to be more frequent than heterosexual coupling.[112] In one study, up to 94 percent of observed mounting incidents took place between males. The proportion of same-sex activities varied from 30 to 75 percent. Only one percent of same-sex mounting incidents occurred between females.[113]

Mortality and health

 
Lioness seen with an adult Masai giraffe kill
 
Red-billed oxpeckers on a giraffe, Zambia

Giraffes have high adult survival probability,[114] and an unusually long lifespan compared to other ruminants, up to 38 years.[115] Adult female survival is significantly correlated with the number of social associations.[116] Because of their size, eyesight and powerful kicks, adult giraffes are mostly safe from predation,[44] with lions being their only major threats.[51]: 55  Calves are much more vulnerable than adults and are also preyed on by leopards, spotted hyenas and wild dogs.[52] A quarter to a half of giraffe calves reach adulthood.[114][117] Calf survival varies according to the season of birth, with calves born during the dry season having higher survival rates.[118]

The local, seasonal presence of large herds of migratory wildebeests and zebras reduces predation pressure on giraffe calves and increases their survival probability.[119] In turn, it has been suggested that other ungulates may benefit from associating with giraffes, as their height allows them to spot predators from further away. Zebras were found to assess predation risk by watching giraffes and spend less time looking around when giraffes are present.[120]

Some parasites feed on giraffes. They are often hosts for ticks, especially in the area around the genitals, which have thinner skin than other areas. Tick species that commonly feed on giraffes are those of genera Hyalomma, Amblyomma and Rhipicephalus. Giraffes may rely on red-billed and yellow-billed oxpeckers to clean them of ticks and alert them to danger. Giraffes host numerous species of internal parasites and are susceptible to various diseases. They were victims of the (now eradicated) viral illness rinderpest.[19] Giraffes can also suffer from a skin disorder, which comes in the form of wrinkles, lesions or raw fissures. As much as 79% of giraffes have symptoms of the disease in Ruaha National Park, but it did not cause mortality in Tarangire and is less prevalent in areas with fertile soils.[121][122][123]

Human relations

Cultural significance

With its lanky build and spotted coat, the giraffe has been a source of fascination throughout human history, and its image is widespread in culture. It has represented flexibility, far-sightedness, femininity, fragility, passivity, grace, beauty and the continent of Africa itself.[124]: 7, 116 

 
San rock art in Namibia depicting a giraffe

Giraffes were depicted in art throughout the African continent, including that of the Kiffians, Egyptians, and Kushites.[124]: 45–47  The Kiffians were responsible for a life-size rock engraving of two giraffes, dated 8,000 years ago, that has been called the "world's largest rock art petroglyph".[124]: 45 [125] How the giraffe got its height has been the subject of various African folktales.[12] The Tugen people of modern Kenya used the giraffe to depict their god Mda.[126] The Egyptians gave the giraffe its own hieroglyph; 'sr' in Old Egyptian and 'mmy' in later periods.[124]: 49 

Giraffes have a presence in modern Western culture. Salvador Dalí depicted them with burning manes in some of his surrealist paintings. Dali considered the giraffe to be a masculine symbol, and a flaming giraffe was meant to be a "masculine cosmic apocalyptic monster".[124]: 123  Several children's books feature the giraffe, including David A. Ufer's The Giraffe Who Was Afraid of Heights, Giles Andreae's Giraffes Can't Dance and Roald Dahl's The Giraffe and the Pelly and Me. Giraffes have appeared in animated films, as minor characters in Disney's The Lion King and Dumbo, and in more prominent roles in The Wild and the Madagascar films. Sophie the Giraffe has been a popular teether since 1961. Another famous fictional giraffe is the Toys "R" Us mascot Geoffrey the Giraffe.[124]: 127 

The giraffe has also been used for some scientific experiments and discoveries. Scientists have used the properties of giraffe skin as a model for astronaut and fighter pilot suits because the people in these professions are in danger of passing out if blood rushes to their legs.[49]: 76  Computer scientists have modeled the coat patterns of several subspecies using reaction–diffusion mechanisms.[127] The constellation of Camelopardalis, introduced in the seventeenth century, depicts a giraffe.[124]: 119–20  The Tswana people of Botswana traditionally see the constellation Crux as two giraffes—Acrux and Mimosa forming a male, and Gacrux and Delta Crucis forming the female.[128]

 
Painting of a giraffe imported to China during the Ming dynasty

Captivity

The Egyptians were among the earliest people to keep giraffes in captivity and shipped them around the Mediterranean.[124]: 48–49  The giraffe was among the many animals collected and displayed by the Romans. The first one in Rome was brought in by Julius Caesar in 46 BC.[124]: 52  With the fall of the Western Roman Empire, the housing of giraffes in Europe declined.[124]: 54  During the Middle Ages, giraffes were known to Europeans through contact with the Arabs, who revered the giraffe for its peculiar appearance.[52]

Individual captive giraffes were given celebrity status throughout history. In 1414, a giraffe from Malindi was taken to China by explorer Zheng He and placed in a Ming dynasty zoo. The animal was a source of fascination for the Chinese people, who associated it with the mythical Qilin.[124]: 56  The Medici giraffe was a giraffe presented to Lorenzo de' Medici in 1486. It caused a great stir on its arrival in Florence.[129] Zarafa, another famous giraffe, was brought from Egypt to Paris in the early 19th century as a gift for Charles X of France. A sensation, the giraffe was the subject of numerous memorabilia or "giraffanalia".[124]: 81 

Giraffes have become popular attractions in modern zoos, though keeping them healthy is difficult as they require vast areas and need to eat large amounts of browse. Captive giraffes in North America and Europe appear to have a higher mortality rate than in the wild; the most common causes being poor husbandry, nutrition and management.[51]: 153  Giraffes in zoos display stereotypical behaviours, particularly the licking of inanimate objects and pacing.[51]: 164  Zookeepers may offer various activities to stimulate giraffes, including training them to take food from visitors.[51]: 167, 176  Stables for giraffes are built particularly high to accommodate their height.[51]: 183 

Exploitation

Giraffes were probably common targets for hunters throughout Africa.[34]: 337  Different parts of their bodies were used for different purposes.[19] Their meat was used for food. The tail hairs served as flyswatters, bracelets, necklaces, and threads. Shields, sandals, and drums were made using the skin, and the strings of musical instruments were from the tendons.[19][34]: 337  In Buganda, the smoke of burning giraffe skin was traditionally used to treat nose bleeds.[34]: 337  The Humr people of Kordofan consume the drink Umm Nyolokh, which is prepared from the liver and bone marrow of giraffes. Richard Rudgley hypothesised that Umm Nyolokh might contain DMT.[130] The drink is said to cause hallucinations of giraffes, believed to be the giraffes' ghosts, by the Humr.[131]

Conservation status

In 2016, giraffes were assessed as Vulnerable from a conservation perspective by the IUCN.[1] In 1985, it was estimated there were 155,000 giraffes in the wild. This declined to over 140,000 in 1999.[30] Estimates as of 2016 indicate there are approximately 97,500 members of Giraffa in the wild.[132][133] The Masai and reticulated subspecies are endangered,[134][135] and the Rothschild subspecies is near threatened.[33] The Nubian subspecies is critically endangered.[136]

 
Endangered West African giraffe near Koure, Niger

The primary causes for giraffe population declines are habitat loss and direct killing for bushmeat markets. Giraffes have been extirpated from much of their historic range, including Eritrea, Guinea, Mauritania and Senegal.[1] They may also have disappeared from Angola, Mali, and Nigeria, but have been introduced to Rwanda and Eswatini.[1][136] As of 2010, there were more than 1,600 in captivity at Species360-registered zoos.[28] Habitat destruction has hurt the giraffe. In the Sahel, the need for firewood and grazing room for livestock has led to deforestation. Normally, giraffes can coexist with livestock, since they avoid direct competition by feeding above them.[37] In 2017, severe droughts in northern Kenya led to increased tensions over land and the killing of wildlife by herders, with giraffe populations being particularly hit.[137]

Protected areas like national parks provide important habitat and anti-poaching protection to giraffe populations.[1] Community-based conservation efforts outside national parks are also effective at protecting giraffes and their habitats.[138][139] Private game reserves have contributed to the preservation of giraffe populations in eastern and southern Africa.[37] The giraffe is a protected species in most of its range. It is the national animal of Tanzania,[140] and is protected by law,[141] and unauthorised killing can result in imprisonment.[142] The UN backed Convention of Migratory Species selected giraffes for protection in 2017.[143] In 2019, giraffes were listed under Appendix II of the Convention on International Trade in Endangered Species (CITES), which means international trade including in parts/derivatives is regulated.[144]

Translocations are sometimes used to augment or re-establish diminished or extirpated populations, but these activities are risky and difficult to undertake using the best practices of extensive pre- and post-translocation studies and ensuring a viable founding population.[145][146] Aerial survey is the most common method of monitoring giraffe population trends in the vast roadless tracts of African landscapes, but aerial methods are known to undercount giraffes. Ground-based survey methods are more accurate and can be used in conjunction with aerial surveys to make accurate estimates of population sizes and trends.[147]

See also

References

  1. ^ a b c d e f g h i j k l m n o p q r s t u v w x y Muller, Z.; Bercovitch, F.; Brand, R.; Brown, D.; Brown, M.; Bolger, D.; Carter, K.; Deacon, F.; Doherty, J.B.; Fennessy, J.; Fennessy, S.; Hussein, A.A.; Lee, D.; Marais, A.; Strauss, M.; Tutchings, A.; Wube, T. (2018) [amended version of 2016 assessment]. "Giraffa camelopardalis". IUCN Red List of Threatened Species. 2018: e.T9194A136266699. doi:10.2305/IUCN.UK.2016-3.RLTS.T9194A136266699.en. Retrieved 12 November 2021.
  2. ^ a b "Giraffe". Online Etymology Dictionary. Retrieved 1 November 2011.
  3. ^ Dehkhoda, Ali-akbar. "زراف". Dehkhoda Lexicon Institute and International Center for Persian Studies. Retrieved 28 December 2022.
  4. ^ Ačaṙean, Hračʿeay (1973). "զուրափէ" [in Hayerēn armatakan baṙaran [Armenian Etymological Dictionary] (in Armenian), volume II, 2nd edition, a reprint of the original 1926–1935 seven-volume edition]. www.nayiri.com. Yerevan: University Press. p. 110a. Retrieved 28 December 2022.
  5. ^ Őrsi, Tibor (2006). French Linguistic Influence in the Cotton Version of Mandeville's Travels. Tinta Könyvkiadó. p. 113. ISBN 9789637094545.
  6. ^ "Definition of CAMELOPARD". m-w.com. Encyclopædia Britannica: Merriam-Webster. Retrieved 3 September 2014.
  7. ^ "Definition of camelopard". Dictionary of Medieval Terms and Phrases. Retrieved 3 September 2014.
  8. ^ a b c d e f g h i j k l Mitchell, G.; Skinner, J. D. (2003). "On the origin, evolution and phylogeny of giraffes Giraffa camelopardalis". Transactions of the Royal Society of South Africa. 58 (1): 51–73. doi:10.1080/00359190309519935. S2CID 6522531.
  9. ^ Chen, L.; Qiu, Q.; Jiang, Y.; Wang, K. (2019). "Large-scale ruminant genome sequencing provides insights into their evolution and distinct traits". Science. 364 (6446): eaav6202. Bibcode:2019Sci...364.6202C. doi:10.1126/science.aav6202. PMID 31221828.
  10. ^ a b c d Danowitz, M.; Vasilyev, A.; Kortlandt, V.; Solounias, V. (2015). "Fossil evidence and stages of elongation of the Giraffa camelopardalis neck". Royal Society Open Science. 2 (10): 150393. Bibcode:2015RSOS....250393D. doi:10.1098/rsos.150393. PMC 4632521. PMID 26587249.
  11. ^ a b Danowitz, M.; Domalski, R.; Solounias, N. (2015). "The cervical anatomy of Samotherium, an intermediate-necked giraffid". Royal Society Open Science. 2 (11): 150521. Bibcode:2015RSOS....250521D. doi:10.1098/rsos.150521. PMC 4680625. PMID 26716010.
  12. ^ a b c d e f g h Simmons, R. E.; Scheepers, L. (1996). (PDF). The American Naturalist. 148 (5): 771–86. doi:10.1086/285955. S2CID 84406669. Archived from the original (PDF) on 23 August 2004.
  13. ^ Janis, Christine M. (1 January 1993). "Tertiary Mammal Evolution in the Context of Changing Climates, Vegetation, and Tectonic Events". Annual Review of Ecology and Systematics. 24: 467–500. doi:10.1146/annurev.ecolsys.24.1.467. JSTOR 2097187.
  14. ^ Ramstein, Gilles; Fluteau, Frédéric; Besse, Jean; Joussaume, Sylvie (24 April 1997). "Effect of orogeny, plate motion and land–sea distribution on Eurasian climate change over the past 30 million years". Nature. 386 (6627): 788–795. Bibcode:1997Natur.386..788R. doi:10.1038/386788a0. S2CID 4335003.
  15. ^ a b c d Badlangana, L. N.; Adams, J. W.; Manger, P. R. (2009). "The giraffe (Giraffa camelopardalis) cervical vertebral column: A heuristic example in understanding evolutionary processes?". Zoological Journal of the Linnean Society. 155 (3): 736–57. doi:10.1111/j.1096-3642.2008.00458.x.
  16. ^ a b Holmes, Bob (19 May 2021). "Heads up! The cardiovascular secrets of giraffes". Knowable Magazine. doi:10.1146/knowable-051821-2. S2CID 236354545. Retrieved 1 August 2022.
  17. ^ Agaba, M.; Ishengoma, E.; Miller, W. C.; McGrath, B. C.; Hudson, C. N.; Bedoya, R. O. C.; Ratan, A.; Burhans, R.; Chikhi, R.; Medvedev, P.; Praul C. A.; Wu-Cavener, L.; Wood, B.; Robertson, H.; Penfold, L.; Cavener, D. R. (2016). "Giraffe genome sequence reveals clues to its unique morphology and physiology". Nature Communications. 7: 11519. Bibcode:2016NatCo...711519A. doi:10.1038/ncomms11519. PMC 4873664. PMID 27187213.
  18. ^ a b Brown, D. M.; Brenneman R. A.; Koepfli, K.-P.; Pollinger, J. P.; Milá, B.; Georgiadis, N. J.; Louis Jr., E. E.; Grether, G. F.; Jacobs, D. K.; Wayne R. K. (2007). "Extensive population genetic structure in the giraffe". BMC Biology. 5 (1): 57. doi:10.1186/1741-7007-5-57. PMC 2254591. PMID 18154651.
  19. ^ a b c d e f g h i j k l m n o Dagg, A. I. (1971). (PDF). Mammalian Species (5): 1–8. doi:10.2307/3503830. JSTOR 3503830. Archived from the original (PDF) on 21 April 2017. Retrieved 25 October 2011.
  20. ^ Gippoliti, S. (2018). "Impacts of taxonomic inertia for the conservation of African ungulate diversity: an overview". Biological Reviews. 93 (1): 115–130. doi:10.1111/brv.12335. PMID 28429851. S2CID 5189968.
  21. ^ a b Groves, Colin; Grubb, Peter (2011). Ungulate Taxonomy. JHU Press. pp. 68–70. ISBN 9781421400938.
  22. ^ a b c Fennessy, Julian; Bidon, Tobias; Reuss, Friederike; Kumar, Vikas; Elkan, Paul; Nilsson, Maria A.; Vamberger, Melita; Fritz, Uwe; Janke, Axel (2016). "Multi-locus Analyses reveal four giraffe species instead of one". Current Biology. 26 (18): 2543–2549. doi:10.1016/j.cub.2016.07.036. PMID 27618261. S2CID 3991170.
  23. ^ a b c Petzold, Alice; Hassanin, Alexandre (13 February 2020). "A comparative approach for species delimitation based on multiple methods of multi-locus DNA sequence analysis: A case study of the genus Giraffa (Mammalia, Cetartiodactyla)". PLOS ONE. 15 (2): e0217956. Bibcode:2020PLoSO..1517956P. doi:10.1371/journal.pone.0217956. ISSN 1932-6203. PMC 7018015. PMID 32053589.
  24. ^ a b c Coimbra, Raphael T.F.; Winter, Sven; Kumar, Vikas; Koepfli, Klaus-Peter; Gooley, Rebecca M.; Dobrynin, Pavel; Fennessy, Julian; Janke, Axel (2021). "Whole-genome analysis of giraffe supports four distinct species". Current Biology. 31 (13): 2929–2938.e5. doi:10.1016/j.cub.2021.04.033. ISSN 0960-9822. PMID 33957077.
  25. ^ a b Linnaeus, Carl (1758). Systema Naturæ.
  26. ^ a b c Hassanin, A.; Ropiquet, A.; Gourmand, B.-L.; Chardonnet, B.; Rigoulet, J. (2007). "Mitochondrial DNA variability in Giraffa camelopardalis: consequences for taxonomy, phylogeography and conservation of giraffes in West and central Africa". Comptes Rendus Biologies. 330 (3): 173–83. doi:10.1016/j.crvi.2007.02.008. PMID 17434121.
  27. ^ a b c d e f g h i Seymour, R. (2002). The taxonomic status of the giraffe, Giraffa camelopardalis (L. 1758) (Ph.D. thesis).
  28. ^ a b c d e f g h . ISIS. 2010. Archived from the original on 6 July 2010. Retrieved 4 November 2010.
  29. ^ Swaison 1835. Camelopardalis antiquorum. Bagger el Homer, Kordofan, about 10° N, 28° E (as fixed by Harper, 1940)
  30. ^ a b . Giraffe Conservation Foundation. Archived from the original on 19 March 2016. Retrieved 21 December 2010.
  31. ^ . Al Ain Zoo. 25 February 2003. Archived from the original on 29 November 2011. Retrieved 21 November 2011.
  32. ^ . UAE Interact. Archived from the original on 20 March 2012. Retrieved 21 December 2010.
  33. ^ a b Fennessy, S.; Fennessy, J.; Muller, Z.; Brown, M.; Marais, A. (2018). "Giraffa camelopardalis ssp. rothschildi". IUCN Red List of Threatened Species. 2018: e.T174469A51140829. doi:10.2305/IUCN.UK.2018-2.RLTS.T174469A51140829.en. Retrieved 19 November 2021.
  34. ^ a b c d e f g h i j k Kingdon, J. (1988). East African Mammals: An Atlas of Evolution in Africa, Volume 3, Part B: Large Mammals. University of Chicago Press. pp. 313–37. ISBN 978-0-226-43722-4.
  35. ^ Fennessy, J.; Marais, A.; Tutchings, A. (2018). "Giraffa camelopardalis ssp. peralta". IUCN Red List of Threatened Species. 2018: e.T136913A51140803.
  36. ^ Winton, W. E. de (1 November 1899). "XXXVIII.—On mammals collected by Lieut.-Colonel W. Giffard in the northern territory of the Gold Coast". Annals and Magazine of Natural History. 4 (23): 353–359. doi:10.1080/00222939908678212. ISSN 0374-5481.
  37. ^ a b c d e f g h i Pellow, R. A. (2001). "Giraffe and Okapi". In MacDonald, D. (ed.). The Encyclopedia of Mammals (2nd ed.). Oxford University Press. pp. 520–27. ISBN 978-0-7607-1969-5.
  38. ^ For the first time in decades, Angolan giraffes now populate a park in Angola, Megan Lim, NPR, 2023-07-11
  39. ^ a b Bock, Friederike; Fennessy, Julian; Bidon, Tobias; Tutchings, Andy; Marais, Andri; Deacon, Francois; Janke, Axel (23 October 2014). "Mitochondrial sequences reveal a clear separation between Angolan and South African giraffe along a cryptic rift valley". BMC Evolutionary Biology. 14 (1): 219. doi:10.1186/s12862-014-0219-7. ISSN 1471-2148. PMC 4207324. PMID 25927851.
  40. ^ a b Winter, Sven; Fennessy, Julian; Fennessy, Stephanie; Janke, Axel (1 July 2018). "Matrilineal population structure and distribution of the Angolan giraffe in the Namib desert and beyond". Ecological Genetics and Genomics. 7–8: 1–5. doi:10.1016/j.egg.2018.03.003. ISSN 2405-9854. S2CID 90395544.
  41. ^ Brenneman, R. A.; Louis, E. E. Jr; Fennessy, J. (2009). "Genetic structure of two populations of the Namibian giraffe, Giraffa camelopardalis angolensis". African Journal of Ecology. 47 (4): 720–28. doi:10.1111/j.1365-2028.2009.01078.x.
  42. ^ Rookmaaker, L. C. (1 June 1989). The Zoological Exploration of Southern Africa 1650–1790. CRC Press. ISBN 9789061918677.
  43. ^ a b Lee, Derek E.; Cavener, Douglas R.; Bond, Monica L. (2 October 2018). "Seeing spots: quantifying mother-offspring similarity and assessing fitness consequences of coat pattern traits in a wild population of giraffes (Giraffa camelopardalis)". PeerJ. 6: e5690. doi:10.7717/peerj.5690. ISSN 2167-8359. PMC 6173159. PMID 30310743.
  44. ^ a b c d e f g h i j k l m n o p q r s t Estes, R. (1992). The Behavior Guide to African Mammals: including Hoofed Mammals, Carnivores, Primates. University of California Press. pp. 202–07. ISBN 978-0-520-08085-0.
  45. ^ van Sittert, Sybrand J.; Mitchell, Graham (4 August 2015). "On reconstructing Giraffa sivalensis, an extinct giraffid from the Siwalik Hills, India". PeerJ. 3: e1135. doi:10.7717/peerj.1135. PMC 4540016. PMID 26290791.
  46. ^ "Giraffa Brisson 1762 (giraffe)". paleobiodb.org. Retrieved 9 December 2021.
  47. ^ a b Nowak, R.M. (1999). Walker's Mammals of the World. Volume 1. The Johns Hopkins University Press. pp. 1086–1089. ISBN 978-0801857898.
  48. ^ a b Skinner, J. D.; Smithers, R. H. M. (1990). The mammals of the southern African subregion. University of Pretoria. pp. 616–20. ISBN 978-0-521-84418-5.
  49. ^ a b c d e f g h Swaby, S. (2010). "Giraffe". In Harris, T. (ed.). Mammal Anatomy: An Illustrated Guide. Marshall Cavendish. pp. 64–84. ISBN 978-0-7614-7882-9.
  50. ^ Langley, Liz (4 March 2017). "Do Zebras Have Stripes On Their Skin?". National Geographic. Retrieved 2 June 2020.
  51. ^ a b c d e f g h i j k l m n o p q r s t Dagg, A. I. (2014). Giraffe: Biology, Behaviour and Conservation. Cambridge University Press. ISBN 978-1107610170.
  52. ^ a b c d e f g Prothero, D. R.; Schoch, R. M. (2003). Horns, Tusks, and Flippers: The Evolution of Hoofed Mammals. Johns Hopkins University Press. pp. 67–72. ISBN 978-0-8018-7135-1.
  53. ^ Foster, J. B. (August 1966). "The Giraffe of Nairobi National Park: Home Range, Sex Ratios, the Herd, and Food". African Journal of Ecology. 4 (1): 139–148. doi:10.1111/j.1365-2028.1966.tb00889.x.
  54. ^ Lee, Derek E.; Lohay, George G.; Cavener, Douglas R.; Bond, Monica L. (6 September 2022). "Using spot pattern recognition to examine population biology, evolutionary ecology, sociality, and movements of giraffes: a 70-year retrospective". Mammalian Biology. 102 (4): 1055–1071. doi:10.1007/s42991-022-00261-3. ISSN 1618-1476. S2CID 252149865.
  55. ^ a b c Mitchell, G.; Skinner, J.D. (2004). "Giraffe thermoregulation: a review". Transactions of the Royal Society of South Africa. 59 (2): 49–57. doi:10.1080/00359190409519170. ISSN 0035-919X. S2CID 87321176.
  56. ^ Wood, W. F.; Weldon, P. J. (2002). "The scent of the reticulated giraffe (Giraffa camelopardalis reticulata)". Biochemical Systematics and Ecology. 30 (10): 913–17. doi:10.1016/S0305-1978(02)00037-6.
  57. ^ a b c d Simmons, R. E.; Altwegg, R. (2010). "Necks-for-sex or competing browsers? A critique of ideas on the evolution of giraffe". Journal of Zoology. 282 (1): 6–12. doi:10.1111/j.1469-7998.2010.00711.x.
  58. ^ Mitchell, G.; Roberts, D. G.; van Sittert, S. J.; Skinner, J. D. (2013). "Orbit orientation and eye morphometrics in giraffes (Giraffa camelopardalis)". African Zoology. 48 (2): 333–339. doi:10.1080/15627020.2013.11407600. hdl:2263/37109. S2CID 219292664.
  59. ^ Peterson, D. (2013). Giraffe Reflections. University of California Press. p. 30. ISBN 978-0520266858.
  60. ^ Taylor, M. P.; Wedel, M. J. (2013). "Why sauropods had long necks; and why giraffes have short necks". PeerJ. 1: e36. doi:10.7717/peerj.36. PMC 3628838. PMID 23638372.
  61. ^ a b Van Sittert, S. J.; Skinner, J. D.; Mitchell, G. (2010). "From fetus to adult – An allometric analysis of the giraffe vertebral column". Journal of Experimental Zoology Part B: Molecular and Developmental Evolution. 314B (6): 469–79. doi:10.1002/jez.b.21353. PMID 20700891.
  62. ^ a b Solounias, N. (1999). "The remarkable anatomy of the giraffe's neck" (PDF). Journal of Zoology. 247 (2): 257–68. doi:10.1111/j.1469-7998.1999.tb00989.x. (PDF) from the original on 25 March 2009.
  63. ^ a b du Toit, J. T. (1990). (PDF). African Journal of Ecology. 28 (1): 55–62. doi:10.1111/j.1365-2028.1990.tb01136.x. Archived from the original (PDF) on 10 November 2011. Retrieved 21 November 2011.
  64. ^ Cameron, E. Z.; du Toit, J. T. (2007). "Winning by a Neck: Tall Giraffes Avoid Competing with Shorter Browsers". American Naturalist. 169 (1): 130–35. doi:10.1086/509940. PMID 17206591. S2CID 52838493.
  65. ^ Woolnough, A. P.; du Toit, J. T. (2001). (PDF). Oecologia. 129 (1): 585–90. Bibcode:2001Oecol.129..585W. doi:10.1007/s004420100771. PMID 24577699. S2CID 18821024. Archived from the original (PDF) on 10 November 2011. Retrieved 7 March 2012.
  66. ^ a b Young, T. P.; Isbell, L. A. (1991). (PDF). Ethology. 87 (1–2): 79–89. doi:10.1111/j.1439-0310.1991.tb01190.x. Archived from the original (PDF) on 16 May 2013. Retrieved 2 February 2012.
  67. ^ Mitchell, G.; van Sittert, S.; Skinner, J. D. (2010). "The demography of giraffe deaths in a drought". Transactions of the Royal Society of South Africa. 65 (3): 165–68. doi:10.1080/0035919X.2010.509153. hdl:2263/18957. S2CID 83652889.
  68. ^ Mitchell, G.; van Sittert, S. J.; Skinner, J. D. (2009). "Sexual selection is not the origin of long necks in giraffes". Journal of Zoology. 278 (4): 281–86. doi:10.1111/j.1469-7998.2009.00573.x.
  69. ^ Brownlee, A. (1963). "Evolution of the Giraffe". Nature. 200 (4910): 1022. Bibcode:1963Natur.200.1022B. doi:10.1038/2001022a0. S2CID 4145785.
  70. ^ Williams, Edgar M. (2016). "Giraffe Stature and Neck Elongation: Vigilance as an Evolutionary Mechanism". Biology. 5 (3): 35. doi:10.3390/biology5030035. PMC 5037354. PMID 27626454.
  71. ^ MacClintock, D.; Mochi, U. (1973). A natural history of giraffes. Scribner. p. 30. ISBN 978-0-684-13239-6.
  72. ^ Wood, C. (7 March 2014). "Groovy giraffes…distinct bone structures keep these animals upright". Society for Experimental Biology. Retrieved 7 May 2014.
  73. ^ Garland, T; Janis, C. M. (1993). (PDF). Journal of Zoology. 229 (1): 133–51. doi:10.1111/j.1469-7998.1993.tb02626.x. Archived from the original (PDF) on 20 November 2018. Retrieved 25 April 2010.
  74. ^ Rafferty, John. P (2011). Grazers (Britannica Guide to Predators and Prey). Britannica Educational Publishing. p. 194. ISBN 978-1-61530-336-6.
  75. ^ a b c Henderson, D. M.; Naish, D. (2010). "Predicting the buoyancy, equilibrium and potential swimming ability of giraffes by computational analysis". Journal of Theoretical Biology. 265 (2): 151–59. Bibcode:2010JThBi.265..151H. doi:10.1016/j.jtbi.2010.04.007. PMID 20385144.
  76. ^ a b Naish, D. (January 2011). "Will it Float?". Scientific American. 304 (1): 22. Bibcode:2011SciAm.304a..22N. doi:10.1038/scientificamerican0111-22. ISSN 0036-8733.
  77. ^ Tobler, I.; Schwierin, B. (1996). "Behavioural sleep in the giraffe (Giraffa camelopardalis) in a zoological garden". Journal of Sleep Research. 5 (1): 21–32. doi:10.1046/j.1365-2869.1996.00010.x. PMID 8795798. S2CID 34605791.
  78. ^ a b Wedel, M. J. (2012). "A monument of inefficiency: the presumed course of the recurrent laryngeal nerve in sauropod dinosaurs" (PDF). Acta Palaeontologica Polonica. 57 (2): 251–56. doi:10.4202/app.2011.0019. S2CID 43447891. (PDF) from the original on 29 October 2013.
  79. ^ Harrison, D. F. N. (1995). The Anatomy and Physiology of the Mammalian Larynx. Cambridge University Press. p. 165. ISBN 978-0-521-45321-9.
  80. ^ Graïc, J-M; Peruffo, A; Ballarin, C; Cozzi, B (2017). "The brain of the giraffe (Giraffa camelopardalis): surface configuration, encephalization quotient, and analysis of the existing literature". The Anatomical Record. 300 (8): 1502–1511. doi:10.1002/ar.23593. PMID 28346748. S2CID 3634656.
  81. ^ Skinner, J. D.; Mitchell, G. (2011). "Lung volumes in giraffes, Giraffa camelopardalis" (PDF). Comparative Biochemistry and Physiology A. 158 (1): 72–78. doi:10.1016/j.cbpa.2010.09.003. hdl:2263/16472. PMID 20837156.
  82. ^ Mitchell, G.; Skinner, J. D. (1993). "How giraffe adapt to their extraordinary shape". Transactions of the Royal Society of South Africa. 48 (2): 207–18. doi:10.1080/00359199309520271.
  83. ^ Mitchell, G.; van Sittert, S. J.; Skinner, J. D. (2009). "The structure and function of giraffe jugular vein valves" (PDF). South African Journal of Wildlife Research. 39 (2): 175–80. doi:10.3957/056.039.0210. hdl:2263/13994. S2CID 55201969.
  84. ^ Pérez, W.; Lima, M.; Clauss, M. (2009). "Gross anatomy of the intestine in the giraffe (Giraffa camelopardalis)" (PDF). Anatomia, Histologia, Embryologia. 38 (6): 432–35. doi:10.1111/j.1439-0264.2009.00965.x. PMID 19681830. S2CID 28390695. (PDF) from the original on 22 July 2018.
  85. ^ Cave, A. J. E. (1950). "On the liver and gall-bladder of the Giraffe". Proceedings of the Zoological Society of London. 120 (2): 381–93. doi:10.1111/j.1096-3642.1950.tb00956.x.
  86. ^ Oldham-Ott, Carla K.; Gilloteaux, Jacques (1997). "Comparative morphology of the gallbladder and biliary tract in vertebrates: variation in structure, homology in function and gallstones". Microscopy Research and Technique. 38 (6): 571–79. doi:10.1002/(SICI)1097-0029(19970915)38:6<571::AID-JEMT3>3.0.CO;2-I. PMID 9330347. S2CID 20040338.
  87. ^ Fennessy, J. (2004). Ecology of desert-dwelling giraffe Giraffa camelopardalis angolensis in northwestern Namibia (PhD thesis). University of Sydney.
  88. ^ a b c Kingdon, J. (1997). The Kingdon Field Guide to African Mammals. Academic Press. pp. 339–44. ISBN 978-0-12-408355-4.
  89. ^ a b Bond, Monica L.; Lee, Derek E.; Ozgul, Arpat; König, Barbara (27 August 2019). "Fission–fusion dynamics of a megaherbivore are driven by ecological, anthropogenic, temporal, and social factors". Oecologia. 191 (2): 335–347. Bibcode:2019Oecol.191..335B. doi:10.1007/s00442-019-04485-y. ISSN 1432-1939. PMID 31451928. S2CID 201732871.
  90. ^ van der Jeugd, H. P.; Prins, H. H. T. (2000). (PDF). Journal of Zoology. 251 (1): 15–21. doi:10.1111/j.1469-7998.2000.tb00588.x. Archived from the original (PDF) on 6 November 2013.
  91. ^ a b c d e f Pratt D. M.; Anderson V. H. (1985). "Giraffe social behavior". Journal of Natural History. 19 (4): 771–81. doi:10.1080/00222938500770471.
  92. ^ a b Bond, Monica L.; König, Barbara; Lee, Derek E.; Ozgul, Arpat; Farine, Damien R. (2020). "Proximity to humans affects local social structure in a giraffe metapopulation". Journal of Animal Ecology. 90 (1): 212–221. doi:10.1111/1365-2656.13247. ISSN 1365-2656. PMID 32515083.
  93. ^ Bercovitch, F. B.; Berry, P. S. M. (2013). "Herd composition, kinship and fission–fusion social dynamics among wild giraffe". African Journal of Ecology. 51 (2): 206–216. doi:10.1111/aje.12024.
  94. ^ a b Carter, K. D.; Seddon, J. M.; Frèreb, C. H.; Carter, J. K. (2013). "Fission–fusion dynamics in wild giraffes may be driven by kinship, spatial overlap and individual social preferences". Animal Behaviour. 85 (2): 385–394. doi:10.1016/j.anbehav.2012.11.011. S2CID 53176817.
  95. ^ a b c d e VanderWaal, K. L.; Wang, H.; McCowan, B.; Fushing, H.; Isbell, L. A. (2014). "Multilevel social organization and space use in reticulated giraffe (Giraffa camelopardalis)". Behavioral Ecology. 25 (1): 17–26. doi:10.1093/beheco/art061.
  96. ^ Bond, Monica L.; König, Barbara; Ozgul, Arpat; Farine, Damien R.; Lee, Derek E. (2021). "Socially Defined Subpopulations Reveal Demographic Variation in a Giraffe Metapopulation". The Journal of Wildlife Management. 85 (5): 920–931. doi:10.1002/jwmg.22044. ISSN 1937-2817. S2CID 233600744.
  97. ^ Bond, Monica L.; Lee, Derek E.; Ozgul, Arpat; Farine, Damien R.; König, Barbara (December 2021). "Leaving by staying: Social dispersal in giraffes". Journal of Animal Ecology. 90 (12): 2755–2766. doi:10.1111/1365-2656.13582. ISSN 0021-8790. PMC 9291750.
  98. ^ Lavista Ferres, Juan M.; Lee, Derek E.; Nasir, Md; Chen, Yu-Chia; Bijral, Avleen S.; Bercovitch, Fred B.; Bond, Monica L. (1 October 2021). "Social connectedness and movements among communities of giraffes vary by sex and age class". Animal Behaviour. 180: 315–328. doi:10.1016/j.anbehav.2021.08.008. ISSN 0003-3472. S2CID 237949827.
  99. ^ a b c d Leuthold, B. M. (1979). "Social organization and behaviour of giraffe in Tsavo East National Park". African Journal of Ecology. 17 (1): 19–34. doi:10.1111/j.1365-2028.1979.tb00453.x.
  100. ^ Knüsel, Mara; Lee, Derek; König, Barbara; Bond, Monica (March 2019). "Correlates of home range sizes of giraffes, Giraffa camelopardalis" (PDF). Animal Behaviour. 149: 143–151. doi:10.1016/j.anbehav.2019.01.017. S2CID 72332291. (PDF) from the original on 10 February 2020.
  101. ^ a b Kasozi, H.; Montgomery, R. A. (2018). "How do giraffes locate one another? A review of visual, auditory, and olfactory communication among giraffes". Journal of Zoology. 306 (3): 139–146. doi:10.1111/jzo.12604.
  102. ^ Volodina, Elena V.; Volodin, Ilya A.; Chelysheva, Elena V.; Frey, Roland (2018). "Hiss and snort call types of wild-living giraffes Giraffa camelopardalis: acoustic structure and context". BMC Research Notes. 11 (12): 12. doi:10.1186/s13104-017-3103-x. PMC 5761111. PMID 29316966.
  103. ^ Baotic, A.; Sicks, F.; Stoeger, A. S. (2015). "Nocturnal "humming" vocalizations: adding a piece to the puzzle of giraffe vocal communication". BMC Research Notes. 8: 425. doi:10.1186/s13104-015-1394-3. PMC 4565008. PMID 26353836.
  104. ^ Von Muggenthaler, E (2013). "Giraffe Helmholtz resonance". Proceedings of Meetings on Acoustics. 19 (1): 010012. doi:10.1121/1.4800658.
  105. ^ a b del Castillo, Susan M.; Bashaw, Meredith J.; Patton, Marilyn L.; Rieches, Randy R.; Bercovitch, Fred B. (1 May 2005). "Fecal steroid analysis of female giraffe (Giraffa camelopardalis) reproductive condition and the impact of endocrine status on daily time budgets". General and Comparative Endocrinology. 141 (3): 271–281. doi:10.1016/j.ygcen.2005.01.011. ISSN 0016-6480. PMID 15804514.
  106. ^ Bercovitch, Fred B.; Bashaw, Meredith J.; del Castillo, Susan M. (1 August 2006). "Sociosexual behavior, male mating tactics, and the reproductive cycle of giraffe Giraffa camelopardalis". Hormones and Behavior. 50 (2): 314–321. doi:10.1016/j.yhbeh.2006.04.004. ISSN 0018-506X. PMID 16765955. S2CID 45843281.
  107. ^ Seeber, Peter A.; Duncan, Patrick; Fritz, Hervé; Ganswindt, André (23 October 2013). "Androgen changes and flexible rutting behaviour in male giraffes". Biology Letters. 9 (5): 20130396. doi:10.1098/rsbl.2013.0396. PMC 3971675. PMID 23925833.
  108. ^ a b c Langman, V. A. (1977). "Cow-calf relationships in giraffe (Giraffa camelopardalis giraffa)". Zeitschrift für Tierpsychologie. 43 (3): 264–86. doi:10.1111/j.1439-0310.1977.tb00074.x.
  109. ^ Saito, M; Idani, G (2018). "Suckling and allosuckling behavior in wild giraffe (Giraffa camelopardalis tippelskirchi)". Mammalian Biology. 93: 1–4. doi:10.1016/j.mambio.2018.07.005. S2CID 91472891.
  110. ^ Gloneková, M; Brandlová, K; Pluháček, J (2021). "Further behavioural parameters support reciprocity and milk theft as explanations for giraffe allonursing". Scientific Reports. 11 (1): 7024. Bibcode:2021NatSR..11.7024G. doi:10.1038/s41598-021-86499-2. PMC 8007720. PMID 33782483.
  111. ^ Hall-Martin A. J.; Skinner J. D.; Hopkins B. J. (1978). "The development of the reproductive organs of the male giraffe, Giraffa camelopardalis" (PDF). Journal of Reproduction and Fertility. 52 (1): 1–7. doi:10.1530/jrf.0.0520001. PMID 621681.
  112. ^ Coe, M. J. (1967). "'Necking' behavior in the giraffe". Journal of Zoology. 151 (2): 313–21. doi:10.1111/j.1469-7998.1967.tb02117.x.
  113. ^ Bagemihl, B. (1999). Biological Exuberance: Animal Homosexuality and Natural Diversity. St. Martin's Press. pp. 391–93. ISBN 978-0-312-19239-6.
  114. ^ a b Lee, D. E.; Strauss, M. K. L (1 January 2016). Reference Module in Earth Systems and Environmental Sciences. Elsevier. doi:10.1016/B978-0-12-409548-9.09721-9. ISBN 9780124095489.
  115. ^ Müller, DW; Zerbe, P; Codron, D; Clauss, M; Hatt, JM (2011). "A long life among ruminants: giraffids and other special cases". Schweizer Archiv für Tierheilkunde. 153 (11): 515–519. doi:10.1024/0036-7281/a000263. PMID 22045457. S2CID 10687135.
  116. ^ Bond, M. L.; Lee, D. E.; Farine, D. R.; Ozgul, A.; König, B. (10 February 2021). "Sociability increases survival of adult female giraffes". Proceedings of the Royal Society B: Biological Sciences. 288 (1944): 20202770. doi:10.1098/rspb.2020.2770. PMC 7893237. PMID 33563118.
  117. ^ Lee, Derek E.; Bond, Monica L.; Kissui, Bernard M.; Kiwango, Yustina A.; Bolger, Douglas T. (11 May 2016). "Spatial variation in giraffe demography: a test of 2 paradigms". Journal of Mammalogy. 97 (4): 1015–1025. doi:10.1093/jmammal/gyw086. ISSN 0022-2372. S2CID 87117946.
  118. ^ Lee, Derek Edward; Bond, Monica Louise; Bolger, Douglas Thomas (1 January 2017). "Season of birth affects juvenile survival of giraffe". Population Ecology. 59 (1): 45–54. doi:10.1007/s10144-017-0571-8. ISSN 1438-3896. S2CID 7611046.
  119. ^ Lee, Derek E.; Kissui, Bernard M.; Kiwango, Yustina A.; Bond, Monica L. (2016). "Migratory herds of wildebeests and zebras indirectly affect calf survival of giraffes". Ecology and Evolution. 6 (23): 8402–8411. doi:10.1002/ece3.2561. ISSN 2045-7758. PMC 5167056. PMID 28031792.
  120. ^ Schmitt, M. H.; Stears, K.; Shrader, A. M. (2016). "Zebra reduce predation risk in mixed-species herds by eavesdropping on cues from giraffe". Behavioral Ecology. 27 (4): 1073–1077. doi:10.1093/beheco/arw015.
  121. ^ Lee, Derek E.; Bond, Monica L. (26 July 2016). "The Occurrence and Prevalence of Giraffe Skin Disease in Protected Areas of Northern Tanzania". Journal of Wildlife Diseases. 52 (3): 753–755. doi:10.7589/2015-09-247. PMID 27310168. S2CID 10736316.
  122. ^ Bond, Monica L.; Strauss, Megan K. L.; Lee, Derek E. (16 August 2016). "Soil Correlates and Mortality from Giraffe Skin Disease in Tanzania". Journal of Wildlife Diseases. 52 (4): 953–958. doi:10.7589/2016-02-047. ISSN 0090-3558. PMID 27529292. S2CID 46776142.
  123. ^ Muneza, Arthur B.; Montgomery, Robert A.; Fennessy, Julian T.; Dickman, Amy J.; Roloff, Gary J.; Macdonald, David W. (1 June 2016). "Regional variation of the manifestation, prevalence, and severity of giraffe skin disease: A review of an emerging disease in wild and captive giraffe populations". Biological Conservation. 198: 145–156. doi:10.1016/j.biocon.2016.04.014.
  124. ^ a b c d e f g h i j k l Williams, E. (2011). Giraffe. Reaktion Books. ISBN 978-1-86189-764-0.
  125. ^ "The Dabous Giraffe rock art petrograph". The Bradshaw Foundation. Retrieved 6 November 2011.
  126. ^ Shorrocks, B. (2016). The Giraffe: Biology, Ecology, Evolution and Behaviour. Wiley. p. 3. ISBN 9781118587478.
  127. ^ Walter, M.; Fournier, A.; Menevaux, D. (2001). (PDF). Proceedings of the 28th annual conference on Computer graphics and interactive techniques. pp. 317–26. CiteSeerX 10.1.1.10.7622. doi:10.1145/383259.383294. ISBN 978-1-58113-374-5. S2CID 13488215. Archived from the original on 23 September 2015. Retrieved 16 November 2011.
  128. ^ Clegg, A. (1986). "Some Aspects of Tswana Cosmology". Botswana Notes and Records. 18: 33–37. JSTOR 40979758.
  129. ^ Ringmar, E. (2006). "Audience for a Giraffe: European Expansionism and the Quest for the Exotic" (PDF). Journal of World History. 17 (4): 353–97. doi:10.1353/jwh.2006.0060. JSTOR 20079397. S2CID 143808549. (PDF) from the original on 10 September 2008.
  130. ^ Rudgley, Richard The Encyclopedia of Psychoactive Substances, pub. Abacus 1998 ISBN 0 349 11127 8 pps. 20–21.
  131. ^ Ian Cunnison (1958). "Giraffe hunting among the Humr tribe". Sudan Notes and Records. 39.
  132. ^ Matt McGrath (8 December 2016). "Giraffes facing 'silent extinction' as population plunges". BBC News. Retrieved 8 December 2016.
  133. ^ "New bird species and giraffe under threat – IUCN Red List". 8 December 2016.
  134. ^ Bolger, D.; Ogutu, J.; Strauss, M.; Lee, D.; Muneza, A.; Fennessy, J.; Brown, D. (2019). "Masai Giraffe". IUCN Red List of Threatened Species. 2019. doi:10.2305/IUCN.UK.2019-1.RLTS.T88421036A88421121.en.
  135. ^ Muneza, A.; Doherty, J. B.; Hussein Ali, A.; Fennessy, J.; Marais, A.; O'Connor, D.; Wube, T. (2018). "Reticulated Giraffe". IUCN Red List of Threatened Species. 2018. doi:10.2305/IUCN.UK.2018-2.RLTS.T88420717A88420720.en.
  136. ^ a b Wube, T.; Doherty, J. B.; Fennessy, J.; Marais, A. (2018). "Giraffa camelopardalis ssp. camelopardalis". IUCN Red List of Threatened Species. 2018. doi:10.2305/IUCN.UK.2018-2.RLTS.T88420707A88420710.en.
  137. ^ Qiu, Jane (2017). "Surge in wildlife killings is wiping out giraffes". Science. doi:10.1126/science.aan7000.
  138. ^ Lee, Derek E. (2018). "Evaluating conservation effectiveness in a Tanzanian community wildlife management area". The Journal of Wildlife Management. 82 (8): 1767–1774. doi:10.1002/jwmg.21549. ISSN 1937-2817. S2CID 91251633.
  139. ^ Lee, Derek E; Bond, Monica L. (2018). "Quantifying the ecological success of a community-based wildlife conservation area in Tanzania". Journal of Mammalogy. 99 (2): 459–464. doi:10.1093/jmammal/gyy014. ISSN 0022-2372. PMC 5965405. PMID 29867255.
  140. ^ Knappert, J (1987). East Africa: Kenya, Tanzania & Uganda. Vikas Publishing House. p. 57. ISBN 978-0-7069-2822-8.
  141. ^ Charles Foley; Lara Foley; Alex Lobora; Daniela De Luca; Maurus Msuha; Tim R. B. Davenport; Sarah M. Durant (2014). A Field Guide to the Larger Mammals of Tanzania. Princeton University Press. pp. 179–. ISBN 978-1-4008-5280-2.
  142. ^ . tanzania.go.tz. Tanzania Government Portal. Archived from the original on 18 January 2015. Retrieved 14 January 2015.
  143. ^ "Chimpanzees among 33 breeds selected for special protection". BBC News. 28 October 2017. Retrieved 30 October 2017.
  144. ^ "Good News for Giraffes at CITES CoP18 > Newsroom". newsroom.wcs.org. Retrieved 16 November 2020.
  145. ^ Muller, Zoe; Lee, Derek E.; Scheijen, Ciska P. J.; Strauss, Megan K. L.; Carter, Kerryn D.; Deacon, Francois (2020). "Giraffe translocations: A review and discussion of considerations". African Journal of Ecology. 58 (2): 159–171. doi:10.1111/aje.12727.
  146. ^ Lee, De; Fienieg, E.; Van Oosterhout, C.; Muller, Z.; Strauss, M.; Carter, Kd.; Scheijen, Cpj; Deacon, F. (27 February 2020). "Giraffe translocation population viability analysis". Endangered Species Research. 41: 245–252. doi:10.3354/esr01022.
  147. ^ Lee, Derek E.; Bond, Monica L. (2016). "Precision, accuracy, and costs of survey methods for giraffe Giraffa camelopardalis". Journal of Mammalogy. 97 (3): 940–948. doi:10.1093/jmammal/gyw025. S2CID 87384776.

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  • Official website of the Giraffe Conservation Foundation

August 27, 2023
giraffe, other, uses, disambiguation, giraffe, large, african, hoofed, mammal, belonging, genus, giraffa, tallest, living, terrestrial, animal, largest, ruminant, earth, traditionally, giraffes, were, thought, species, giraffa, camelopardalis, with, nine, subs. For other uses see Giraffe disambiguation The giraffe is a large African hoofed mammal belonging to the genus Giraffa It is the tallest living terrestrial animal and the largest ruminant on Earth Traditionally giraffes were thought to be one species Giraffa camelopardalis with nine subspecies Most recently researchers proposed dividing them into up to eight extant species due to new research into their mitochondrial and nuclear DNA as well as morphological measurements Seven other extinct species of Giraffa are known from the fossil record GiraffeTemporal range 11 61 0 Ma PreꞒ Ꞓ O S D C P T J K Pg N Miocene to RecentMasai giraffe G c tippelskirchi in Mikumi National Park TanzaniaConservation statusVulnerable IUCN 3 1 1 As the species complex Scientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataClass MammaliaOrder ArtiodactylaFamily GiraffidaeGenus GiraffaLinnaeus 1758Species G camelopardalisBinomial nameGiraffa camelopardalisLinnaeus 1758SpeciesSee taxonomyDistribution of the giraffeThe giraffe s chief distinguishing characteristics are its extremely long neck and legs its horn like ossicones and its spotted coat patterns It is classified under the family Giraffidae along with its closest extant relative the okapi Its scattered range extends from Chad in the north to South Africa in the south and from Niger in the west to Somalia in the east Giraffes usually inhabit savannahs and woodlands Their food source is leaves fruits and flowers of woody plants primarily acacia species which they browse at heights most other herbivores cannot reach Lions leopards spotted hyenas and African wild dogs may prey upon giraffes Giraffes live in herds of related females and their offspring or bachelor herds of unrelated adult males but are gregarious and may gather in large aggregations Males establish social hierarchies through necking combat bouts where the neck is used as a weapon Dominant males gain mating access to females which bear sole responsibility for rearing the young The giraffe has intrigued various ancient and modern cultures for its peculiar appearance and has often been featured in paintings books and cartoons It is classified by the International Union for Conservation of Nature IUCN as vulnerable to extinction and has been extirpated from many parts of its former range Giraffes are still found in numerous national parks and game reserves but estimates as of 2016 indicate there are approximately 97 500 members of Giraffa in the wild More than 1 600 were kept in zoos in 2010 Contents 1 Etymology 2 Taxonomy 2 1 Evolution 2 2 Species and subspecies 3 Characteristics 3 1 Head 3 2 Neck 3 3 Legs locomotion and posture 3 4 Internal systems 4 Behaviour and ecology 4 1 Habitat and feeding 4 2 Social life 4 3 Reproduction and parental care 4 4 Necking 4 5 Mortality and health 5 Human relations 5 1 Cultural significance 5 2 Captivity 5 3 Exploitation 6 Conservation status 7 See also 8 References 9 External linksEtymologyThe name giraffe has its earliest known origins in the Arabic word zarafah زرافة 2 ultimately from Persian ز رن اپ ا zurnapa a compound of ز رن ا zurna flute zurna and پ ا pa leg 3 4 In early Modern English the spellings jarraf and ziraph were used probably directly from the Arabic 5 and in Middle English jarraf and ziraph gerfauntz The Italian form giraffa arose in the 1590s The modern English form developed around 1600 from the French girafe 2 Camelopard k e ˈ m ɛ l e ˌ p ɑːr d is an archaic English name for the giraffe it derives from the Ancient Greek kamhlopardalis kamelopardalis from kamhlos kamelos camel and pardalis pardalis leopard referring to its camel like shape and leopard like colouration 6 7 TaxonomyEvolution The giraffe is one of only two living genera of the family Giraffidae in the order Artiodactyla the other being the okapi 8 They are ruminants of the clade Pecora along with Antilocapridae pronghorns Cervidae deer Bovidae cattle antelope goats and sheep and Moschidae musk deer A 2019 genome study cladogram below finds that Giraffidae are a sister taxon to Antilocapridae with an estimated split of over 20 million years ago 9 Ruminantia Tragulina Tragulidae Pecora Antilocapridae Giraffidae Cervidae Bovidae Moschidae The family Giraffidae was once much more extensive with over 10 fossil genera described 8 The elongation of the neck appears to have started early in the giraffe lineage Comparisons between giraffes and their ancient relatives suggest vertebrae close to the skull lengthened earlier followed by lengthening of vertebrae further down 10 One early giraffid ancestor was Canthumeryx which has been dated variously to have lived 25 20 mya 17 15 mya or 18 14 3 mya and whose deposits have been found in Libya This animal resembled an antelope and had a medium sized lightly built body Giraffokeryx appeared 15 12 mya on the Indian subcontinent and resembled an okapi or a small giraffe and had a longer neck and similar ossicones 8 Giraffokeryx may have shared a clade with more massively built giraffids like Sivatherium and Bramatherium 10 The extinct giraffid Samotherium middle in comparison with the okapi below and giraffe The anatomy of Samotherium appears to have shown a transition to a giraffe like neck 11 Giraffids like Palaeotragus Shansitherium and Samotherium appeared 14 mya and lived throughout Africa and Eurasia These animals had broader skulls with reduced frontal cavities 8 10 Paleotragus resembled the okapi and may have been its ancestor 8 Others find that the okapi lineage diverged earlier before Giraffokeryx 10 Samotherium was a particularly important transitional fossil in the giraffe lineage as the length and structure of its cervical vertebrae were between those of a modern giraffe and an okapi and its neck posture was likely similar to the former s 11 Bohlinia which first appeared in southeastern Europe and lived 9 7 mya was likely a direct ancestor of the giraffe Bohlinia closely resembled modern giraffes having a long neck and legs and similar ossicones and dentition 8 Bohlinia colonised China and northern India and produced the Giraffa which around 7 mya reached Africa Climate changes led to the extinction of the Asian giraffes while the African giraffes survived and radiated into new species Living giraffes appear to have arisen around 1 mya in eastern Africa during the Pleistocene 8 Some biologists suggest the modern giraffes descended from G jumae 12 others find G gracilis a more likely candidate G jumae was larger and more robust while G gracilis was smaller and more slender 8 The changes from extensive forests to more open habitats which began 8 mya are believed to be the main driver for the evolution of giraffes 8 During this time tropical plants disappeared and were replaced by arid C4 plants and a dry savannah emerged across eastern and northern Africa and western India 13 14 Some researchers have hypothesised that this new habitat coupled with a different diet including acacia species may have exposed giraffe ancestors to toxins that caused higher mutation rates and a higher rate of evolution 15 The coat patterns of modern giraffes may also have coincided with these habitat changes Asian giraffes are hypothesised to have had more okapi like colourations 8 The giraffe genome is around 2 9 billion base pairs in length compared to the 3 3 billion base pairs of the okapi Of the proteins in giraffe and okapi genes 19 4 are identical The divergence of giraffe and okapi lineages dates to around 11 5 mya A small group of regulatory genes in the giraffe appear to be responsible for the animal s height and associated circulatory adaptations 16 17 Species and subspecies Map showing Approximate geographic ranges fur patterns and phylogenetic relationships between some giraffe subspecies based on mitochondrial DNA sequences Colored dots on the map represent sampling localities The phylogenetic tree is a maximum likelihood phylogram based on samples from 266 giraffes Asterisks along branches correspond to node values of more than 90 bootstrap support Stars at branch tips identify paraphyletic haplotypes found in Maasai and reticulated giraffes 18 The International Union for Conservation of Nature IUCN currently recognises only one species of giraffe with nine subspecies 1 Carl Linnaeus originally classified living giraffes as one species in 1758 He gave it the binomial name Cervus camelopardalis Mathurin Jacques Brisson coined the generic name Giraffa in 1762 19 During the 1900s various taxonomies with two or three species were proposed 20 A 2007 study on the genetics of giraffes using mitochondrial DNA suggested at least six lineages could be recognised as species 18 A 2011 study using detailed analyses of the morphology of giraffes and application of the phylogenetic species concept described eight species of living giraffes 21 A 2016 study also concluded that living giraffes consist of multiple species The researchers suggested the existence of four species which have not exchanged genetic information between each other for 1 to 2 million years 22 A 2020 study showed that depending on the method chosen different taxonomic hypotheses recognizing from two to six species can be considered for the genus Giraffa 23 That study also found that multi species coalescent methods can lead to taxonomic over splitting as those methods delimit geographic structures rather than species The three species hypothesis which recognises G camelopardalis G giraffa and G tippelskirchi is highly supported by phylogenetic analyses and also corroborated by most population genetic and multi species coalescent analyses 23 A 2021 whole genome sequencing study suggests the existence of four distinct species and seven subspecies 24 The cladogram below shows the phylogenetic relationship between the four proposed species and seven subspecies based on the genome analysis 24 Note the eight lineages correspond to eight of the traditional subspecies in the one species hypothesis The Rothschild giraffe is subsumed into G camelopardalis camelopardalis Giraffa Giraffa camelopardalis G camelopardalis antiquorum Kordofan giraffe G c camelopardalis Nubian giraffe G c peralta West African giraffe northern giraffe G reticulata no subspecies reticulated giraffe G tippelskirchi G tippelskirchi tippelskirchi Masai giraffe sensu stricto G t thornicrofti Luangwa or Thornicroft s giraffe Masai giraffe sensu lato G giraffa G giraffa angolensis Angolan giraffe G g giraffa South African giraffe southern giraffe The following table compares the different hypotheses for giraffe species The description column shows the traditional nine subspecies in the one species hypothesis 1 25 Species and subspecies of giraffe Description Image Eight species taxonomy 21 Four species taxonomy 22 24 Three species taxonomy 23 The Kordofan giraffe G c antiquorum has a distribution which includes southern Chad the Central African Republic northern Cameroon and the northeastern DR Congo 1 Populations in Cameroon were formerly included in G c peralta but this was incorrect 26 Compared to the Nubian giraffe this subspecies has smaller and more irregular spotting patterns Its spots may be found below the hocks and the insides of the legs A median lump is present in males 27 51 52 Some 2 000 are believed to remain in the wild 1 Considerable confusion has existed over the status of this subspecies and G c peralta in zoos In 2007 all alleged G c peralta in European zoos were shown to be in fact G c antiquorum 26 With this correction about 65 are living in zoos 28 Kordofan giraffe G antiquorum 29 Northern giraffe G camelopardalis Three or four subspecies G c antiquorum G c camelopardalis G c peralta G c reticulata only in three species hypothesis The Nubian giraffe G c camelopardalis is found in eastern South Sudan and southwestern Ethiopia in addition to Kenya and Uganda 1 It has sharply defined chestnut coloured spots surrounded by mostly white lines while undersides lack spotting 30 The median lump is particularly developed in the male 27 51 Around 2 150 are thought to remain in the wild with another 1 500 individuals belonging to the Rothschild s ecotype 1 With the addition of Rothschild s giraffe to the Nubian subspecies the Nubian giraffe is very common in captivity although the original phenotype is rare a group is kept at Al Ain Zoo in the United Arab Emirates 31 In 2003 this group numbered 14 32 Nubian giraffe G camelopardalis 25 Also known as Baringo giraffe or Ugandan giraffe Two subspecies G c camelopardalis G c rothschildi Rothschild s giraffe Rothschild s giraffe G c rothschildi may be an ecotype of G camelopardalis Its range includes parts of Uganda and Kenya 1 Its presence in South Sudan is uncertain 33 This giraffe has large dark patches that usually have complete margins but may also have sharp edges The dark spots may also have paler radiating lines or streaks within them Spotting rarely reaches below the hocks and almost never to the hooves This ecotype may also develop five horns 27 53 Around 1 500 individuals believed to remain in the wild 1 and more than 450 are living in zoos 28 According to genetic analysis circa September 2016 it is conspecific with the Nubian giraffe G c camelopardalis 22 The West African giraffe G c peralta is endemic to southwestern Niger 1 This animal has a lighter pelage fur than other subspecies 34 322 with red lobe shaped blotches that reach below the hocks The ossicones are more erect than in other subspecies and males have well developed median lumps 27 52 53 It is the most endangered subspecies within Giraffa with 400 individuals remaining in the wild 1 Giraffes in Cameroon were formerly believed to belong to this species but are actually G c antiquorum This error resulted in some confusion over its status in zoos but in 2007 it was established that all G c peralta kept in European zoos are actually G c antiquorum The same 2007 study found that the West African giraffe was more closely related to Rothschild s giraffe than the Kordofan and its ancestor may have migrated from eastern to northern Africa and then west as the Sahara Desert spread At its largest Lake Chad may have acted as a boundary between the West African and Kordofan giraffes during the Holocene before 5000 BC 26 West African giraffe G peralta 35 Also known as Niger giraffe or Nigerian giraffeThe reticulated giraffe G c reticulata is native to northeastern Kenya southern Ethiopia and Somalia 1 Its distinctive coat pattern consists of sharp edged reddish brown polygonal patches divided by a network of thin white lines Spots may or may not extend below the hocks and a median lump is present in males 27 53 An estimated 8 660 individuals remain in the wild 1 and based on International Species Information System records more than 450 are living in zoos 28 Reticulated giraffe G reticulata 36 Also known as Somali giraffeThe Angolan giraffe G c angolensis 37 is found in northern Namibia southwestern Zambia central Botswana western Zimbabwe southern Zimbabwe and since mid 2023 again in Angola 38 1 39 40 A 2009 genetic study on this subspecies suggested the northern Namib Desert and Etosha National Park populations form a separate subspecies 41 This subspecies has large brown blotches with notched edges or angular extensions The spotting pattern extends throughout the legs but not the upper part of the face The neck and rump patches tend to be fairly small The subspecies also has a white ear patch 27 51 About 13 000 animals are estimated to remain in the wild 1 and about 20 are living in zoos 28 Angolan giraffe G angolensis Also known as Namibian giraffe Southern giraffe G giraffa Two subspecies G g angolensis G g giraffaThe South African giraffe G c giraffa is found in northern South Africa southern Botswana northern Botswana and southwestern Mozambique 1 39 40 It has dark somewhat rounded patches with some fine projections on a tawny background colour The spots extend down the legs growing smaller as they do The median lump of males is poorly developed 27 52 A maximum of 31 500 are estimated to remain in the wild 1 and around 45 are living in zoos 28 South African giraffe G giraffa 42 Also known as Cape giraffeThe Masai giraffe G c tippelskirchi can be found in central and southern Kenya and in Tanzania 1 Its coat patterns are highly diverse with spots ranging from mostly rounded and smooth edged to oval shaped and incised or loped edged 43 A median lump is usually present in males 27 54 44 A total of 32 550 are thought to remain in the wild 1 and about 100 are living in zoos 28 Masai giraffe G tippelskirchi 37 Also known as Kilimanjaro giraffe Masai giraffe G tippelskirchi Two subspecies G t tippelskirchi G t thornicroftiThornicroft s giraffe G c thornicrofti is restricted to the Luangwa Valley in eastern Zambia 1 The patches are notched and somewhat star shaped and may or may not extend across the legs The median lump of males is underdeveloped 27 54 No more than 550 remain in the wild 1 with none in zoos 28 It was named after Harry Scott Thornicroft 37 Thornicroft s giraffe G thornicrofti Also known as Luangwa giraffe or Rhodesian giraffeThe first extinct species to be described was Giraffa sivalensis Falconer and Cautley 1843 a reevaluation of a vertebra that was initially described as a fossil of the living giraffe 45 While taxonomic opinion may be lacking on some names the extinct species that have been published include 46 Giraffa gracilis Giraffa jumae Giraffa pomeli Giraffa priscilla Giraffa punjabiensis Giraffa pygmaea Giraffa sivalensis Giraffa stilleiCharacteristics Giraffe skeleton on display at the Museum of Osteology Oklahoma City OklahomaFully grown giraffes stand 4 3 5 7 m 14 19 ft tall with males taller than females 47 The average weight is 1 192 kg 2 628 lb for an adult male and 828 kg 1 825 lb for an adult female 48 Despite its long neck and legs its body is relatively short 49 66 The skin is mostly gray 48 or tan 50 and can reach a thickness of 20 mm 0 79 in 51 87 The 80 100 cm 31 39 in long 37 tail ends in a long dark tuft of hair and is used as a defense against insects 51 94 The coat has dark blotches or patches which can be orange chestnut brown or nearly black surrounded by light hair usually white or cream coloured 52 Male giraffes become darker as they grow old 44 The coat pattern has been claimed to serve as camouflage in the light and shade patterns of savannah woodlands 37 When standing among trees and bushes they are hard to see at even a few metres distance However adult giraffes move about to gain the best view of an approaching predator relying on their size and ability to defend themselves rather than on camouflage which may be more important for calves 8 Each giraffe has a unique coat pattern 53 54 Calves inherit some coat pattern traits from their mothers and variation in some spot traits is correlated with calf survival 43 The skin under the blotches may regulate the animal s body temperature being sites for complex blood vessel systems and large sweat glands 55 The fur may give the animal chemical defense as its parasite repellents give it a characteristic scent At least 11 main aromatic chemicals are in the fur although indole and 3 methylindole are responsible for most of the smell Because males have a stronger odour than females it may also have a sexual function 56 Head Closeup of the head of a northern giraffeBoth sexes have prominent horn like structures called ossicones which can reach 13 5 cm 5 3 in They are formed from ossified cartilage covered in skin and fused to the skull at the parietal bones 44 51 95 97 Being vascularised the ossicones may have a role in thermoregulation 55 and are used in combat between males 57 Appearance is a reliable guide to the sex or age of a giraffe the ossicones of females and young are thin and display tufts of hair on top whereas those of adult males tend to be bald and knobbed on top 44 A lump which is more prominent in males emerges in the middle of the skull 19 Males develop calcium deposits that form bumps on their skulls as they age 52 Multiple sinuses lighten a giraffe s skull 51 103 However as males age their skulls become heavier and more club like helping them become more dominant in combat 44 The occipital condyles at the bottom of the skull allow the animal to tip its head over 90 degrees and grab food on the branches directly above them with the tongue 51 103 110 19 With eyes located on the sides of the head the giraffe has a broad visual field from its great height 51 85 102 Compared to other ungulates giraffe vision is more binocular and the eyes are larger with a greater retinal surface area 58 Giraffes may see in colour 51 85 and their senses of hearing and smell are sharp 52 The ears are movable 51 95 and the nostrils are slit shaped possibly to withstand blowing sand 59 The giraffe s tongue is about 45 cm 18 in long It is black perhaps to protect against sunburn and can grasp foliage and delicately pick off leaves 51 109 110 The upper lip is flexible and hairy to protect against sharp prickles 19 The upper jaw has a hard palate instead of front teeth The molars and premolars are wide with low crowns on the surface 51 106 Neck The giraffe has an extremely elongated neck which can be up to 2 4 m 7 ft 10 in in length 60 Along the neck is a mane made of short erect hairs 19 The neck typically rests at an angle of 50 60 degrees though juveniles are closer to 70 degrees 51 72 73 The long neck results from a disproportionate lengthening of the cervical vertebrae not from the addition of more vertebrae Each cervical vertebra is over 28 cm 11 in long 49 71 They comprise 52 54 per cent of the length of the giraffe s vertebral column compared with the 27 33 percent typical of similar large ungulates including the giraffe s closest living relative the okapi 15 This elongation largely takes place after birth perhaps because giraffe mothers would have a difficult time giving birth to young with the same neck proportions as adults 61 The giraffe s head and neck are held up by large muscles and a nuchal ligament which are anchored by long thoracic vertebrae spines giving them a hump 19 62 37 Adult male reticulated giraffe feeding high on an acacia in KenyaThe giraffe s neck vertebrae have ball and socket joints 49 71 The point of articulation between the cervical and thoracic vertebrae of giraffes is shifted to lie between the first and second thoracic vertebrae T1 and T2 unlike in most other ruminants where the articulation is between the seventh cervical vertebra C7 and T1 15 61 This allows C7 to contribute directly to increased neck length and has given rise to the suggestion that T1 is actually C8 and that giraffes have added an extra cervical vertebra 62 However this proposition is not generally accepted as T1 has other morphological features such as an articulating rib deemed diagnostic of thoracic vertebrae and because exceptions to the mammalian limit of seven cervical vertebrae are generally characterised by increased neurological anomalies and maladies 15 There are several hypotheses regarding the evolutionary origin and maintenance of elongation in giraffe necks 57 Charles Darwin originally suggested the competing browsers hypothesis which has been challenged only recently It suggests that competitive pressure from smaller browsers like kudu steenbok and impala encouraged the elongation of the neck as it enabled giraffes to reach food that competitors could not This advantage is real as giraffes can and do feed up to 4 5 m 15 ft high while even quite large competitors such as kudu can feed up to only about 2 m 6 ft 7 in high 63 There is also research suggesting that browsing competition is intense at lower levels and giraffes feed more efficiently gaining more leaf biomass with each mouthful high in the canopy 64 65 However scientists disagree about just how much time giraffes spend feeding at levels beyond the reach of other browsers 12 57 63 66 and a 2010 study found that adult giraffes with longer necks actually suffered higher mortality rates under drought conditions than their shorter necked counterparts This study suggests that maintaining a longer neck requires more nutrients which puts longer necked giraffes at risk during a food shortage 67 Another theory the sexual selection hypothesis proposes the long necks evolved as a secondary sexual characteristic giving males an advantage in necking contests see below to establish dominance and obtain access to sexually receptive females 12 In support of this theory necks are longer and heavier for males than females of the same age 12 57 and males do not employ other forms of combat 12 However one objection is it fails to explain why female giraffes also have long necks 68 It has also been proposed that the neck serves to give the animal greater vigilance 69 70 Legs locomotion and posture Right hind leg of a Masai giraffe at San Diego ZooA giraffe s front and back legs are about the same length The radius and ulna of the front legs are articulated by the carpus which while structurally equivalent to the human wrist functions as a knee 71 It appears that a suspensory ligament allows the lanky legs to support the animal s great weight 72 The hooves of large male giraffes reach 31 cm 23 cm 12 2 in 9 1 in in diameter 51 98 The fetlock of the leg is low to the ground allowing the hoof to better support the animal s weight Giraffes lack dewclaws and interdigital glands While the pelvis is relatively short the ilium has stretched out crests 19 A giraffe has only two gaits walking and galloping Walking is done by moving the legs on one side of the body then doing the same on the other side 44 When galloping the hind legs move around the front legs before the latter move forward 52 and the tail will curl up 44 The movements of the head and neck provide balance and control momentum while galloping 34 327 29 The giraffe can reach a sprint speed of up to 60 km h 37 mph 73 and can sustain 50 km h 31 mph for several kilometres 74 Giraffes would probably not be competent swimmers as their long legs would be highly cumbersome in the water 75 although they might be able to float 76 When swimming the thorax would be weighed down by the front legs making it difficult for the animal to move its neck and legs in harmony 75 76 or keep its head above the water s surface 75 A giraffe rests by lying with its body on top of its folded legs 34 329 To lie down the animal kneels on its front legs and then lowers the rest of its body To get back up it first gets on its front knees and positions its backside on top of its hindlegs It then pulls up the backside upwards and the front legs stand straight up again At each stage the animal swings its head for balance 51 67 If the giraffe wants to reach down to drink it either spreads its front legs or bends its knees 44 Studies in captivity found the giraffe sleeps intermittently around 4 6 hours per day mostly at night It usually sleeps lying down however standing sleeps have been recorded particularly in older individuals Intermittent short deep sleep phases while lying are characterised by the giraffe bending its neck backwards and resting its head on the hip or thigh a position believed to indicate paradoxical sleep 77 Internal systems Scheme of path of the recurrent laryngeal nerve in giraffeIn mammals the left recurrent laryngeal nerve is longer than the right in the giraffe it is over 30 cm 12 in longer These nerves are longer in the giraffe than in any other living animal 78 the left nerve is over 2 m 6 ft 7 in long 79 Each nerve cell in this path begins in the brainstem and passes down the neck along the vagus nerve then branches off into the recurrent laryngeal nerve which passes back up the neck to the larynx Thus these nerve cells have a length of nearly 5 m 16 ft in the largest giraffes 78 Despite its long neck and large skull the brain of the giraffe is typical for an ungulate 80 Evaporative heat loss in the nasal passages keep the giraffe s brain cool 55 The shape of the skeleton gives the giraffe a small lung volume relative to its mass Its long neck gives it a large amount of dead space in spite of its narrow windpipe The giraffe also has a high tidal volume so the balance of dead space and tidal volume is much the same as other mammals The animal can still provide enough oxygen for its tissues and it can increase its respiratory rate and oxygen diffusion when running 81 Reticulated giraffe bending down to drink in Kenya The circulatory system is adapted to deal with blood flow rushing down its neck The giraffe s circulatory system has several adaptations to compensate for its great height 16 Its 11 kg 25 lb and 60 cm 2 ft heart must generate approximately double the blood pressure required for a human to maintain blood flow to the brain As such the wall of the heart can be as thick as 7 5 cm 3 0 in 52 Giraffes have relatively high heart rates for their size at 150 beats per minute 49 76 When the animal lowers its head the blood rushes down fairly unopposed and a rete mirabile in the upper neck with its large cross sectional area prevents excess blood flow to the brain When it raises again the blood vessels constrict and push blood into the brain so the animal does not faint 82 The jugular veins contain several most commonly seven valves to prevent blood flowing back into the head from the inferior vena cava and right atrium while the head is lowered 83 Conversely the blood vessels in the lower legs are under great pressure because of the weight of fluid pressing down on them To solve this problem the skin of the lower legs is thick and tight preventing too much blood from pouring into them 37 Giraffes have oesophageal muscles that are strong enough to allow regurgitation of food from the stomach up the neck and into the mouth for rumination 49 78 They have four chambered stomachs which are adapted to their specialized diet 19 The intestines of an adult giraffe measure more than 70 m 230 ft in length and have a relatively small ratio of small to large intestine 84 The giraffe has a small compact liver 49 76 In fetuses there may be a small gallbladder that vanishes before birth 19 85 86 Behaviour and ecologyHabitat and feeding A Masai giraffe extending its tongue to feed in Tanzania Its tongue lips and palate are tough enough to deal with sharp thorns in trees Giraffes usually inhabit savannahs and open woodlands They prefer areas dominated by Acacieae Commiphora Combretum and Terminalia tree over Brachystegia which are more densely spaced 34 322 The Angolan giraffe can be found in desert environments 87 Giraffes browse on the twigs of trees preferring those of the subfamily Acacieae and the genera Commiphora and Terminalia 88 which are important sources of calcium and protein to sustain the giraffe s growth rate 8 They also feed on shrubs grass and fruit 34 324 A giraffe eats around 34 kg 75 lb of plant matter daily 44 When stressed giraffes may chew on large branches stripping them of bark 34 325 Giraffes are also recorded to chew old bones 51 102 During the wet season food is abundant and giraffes are more spread out while during the dry season they gather around the remaining evergreen trees and bushes 88 Mothers tend to feed in open areas presumably to make it easier to detect predators although this may reduce their feeding efficiency 66 As a ruminant the giraffe first chews its food then swallows it for processing and then visibly passes the half digested cud up the neck and back into the mouth to chew again 49 78 79 The giraffe requires less food than many other herbivores because the foliage it eats has more concentrated nutrients and it has a more efficient digestive system 88 The animal s faeces come in the form of small pellets 19 When it has access to water a giraffe will go no more than three days without drinking 44 Giraffes have a great effect on the trees that they feed on delaying the growth of young trees for some years and giving waistlines to too tall trees Feeding is at its highest during the first and last hours of daytime Between these hours giraffes mostly stand and ruminate Rumination is the dominant activity during the night when it is mostly done lying down 44 Social life Gathering of female South African giraffes in Tswalu Kalahari Reserve South Africa These animals commonly gather in herds Giraffes are usually found in groups that vary in size and composition according to ecological anthropogenic temporal and social factors 89 Traditionally the composition of these groups had been described as open and ever changing 90 For research purposes a group has been defined as a collection of individuals that are less than a kilometre apart and moving in the same general direction 91 More recent studies have found that giraffes have long lasting social groups or cliques based on kinship sex or other factors and these groups regularly associate with other groups in larger communities or sub communities within a fission fusion society 92 93 94 95 Proximity to humans can disrupt social arrangements 92 Masai giraffes in Tanzania sort themselves into different subpopulations of 60 90 adult females with overlapping ranges each of which differ in reproductive rates and calf mortality 96 Dispersal is male biased and can include spatial and or social dispersal 97 Adult female subpopulations are connected by males into supercommunities of around 300 animals 98 Giraffe hum source source Giraffe hum ogg Vorbis format Giraffe snort source source Giraffe snort ogg Vorbis format Giraffe grunt source source Giraffe grunt ogg Vorbis format Giraffe bursts source source Giraffe bursts ogg Vorbis format Problems playing these files See media help The number of giraffes in a group can range from one up to 66 individuals 89 95 Giraffe groups tend to be sex segregated 95 although mixed sex groups made of adult females and young males also occur 91 Female groups may be matrilineally related 95 Generally females are more selective than males in who they associate with regarding individuals of the same sex 94 Particularly stable giraffe groups are those made of mothers and their young 91 which can last weeks or months 99 Young males also form groups and will engage in playfights However as they get older males become more solitary but may also associate in pairs or with female groups 95 99 Giraffes are not territorial 19 but they have home ranges that vary according to rainfall and proximity to human settlements 100 Male giraffes occasionally roam far from areas that they normally frequent 34 329 Early biologists suggested giraffes were mute and unable to create enough air flow to vibrate their vocal folds 101 To the contrary they have been recorded to communicate using snorts sneezes coughs snores hisses bursts moans grunts growls and flute like sounds 44 101 During courtship males emit loud coughs Females call their young by bellowing Calves will emit bleats mooing and mewing sounds 44 Snorting and hissing is associated with vigilance 102 During nighttime giraffes appear to hum to each other 103 There is some evidence that giraffes use Helmholtz resonance to create infrasound 104 They also communicate with body language Dominant males display to other males with an erect posture holding the chin and head up while walking stiffly and displaying their side The less dominant show submissiveness by dropping the head and ears lowering the chin and fleeing 44 Reproduction and parental care Angolan giraffes mating in NamibiaReproduction in giraffes is broadly polygamous a few older males mate with the fertile females 91 Females can reproduce throughout the year and experience oestrus cycling approximately every 15 days 105 106 Female giraffes in oestrous are dispersed over space and time so reproductive adult males adopt a strategy of roaming among female groups to seek mating opportunities with periodic hormone induced rutting behaviour approximately every two weeks 107 Males prefer young adult females over juveniles and older adults 91 Male giraffes assess female fertility by tasting the female s urine to detect oestrus in a multi step process known as the flehmen response 91 99 Once an oestrous female is detected the male will attempt to court her When courting dominant males will keep subordinate ones at bay 99 A courting male may lick a female s tail lay his head and neck on her body or nudge her with his ossicones During copulation the male stands on his hind legs with his head held up and his front legs resting on the female s sides 44 Giraffe gestation lasts 400 460 days after which a single calf is normally born although twins occur on rare occasions 105 The mother gives birth standing up The calf emerges head and front legs first having broken through the fetal membranes and falls to the ground severing the umbilical cord 19 A newborn giraffe is 1 7 2 m 5 6 6 6 ft tall 47 Within a few hours of birth the calf can run around and is almost indistinguishable from a one week old However for the first one to three weeks it spends most of its time hiding 108 its coat pattern providing camouflage The ossicones which have lain flat in the womb raise up in a few days 44 Female Angolan giraffe with calfMothers with calves will gather in nursery herds moving or browsing together Mothers in such a group may sometimes leave their calves with one female while they forage and drink elsewhere This is known as a calving pool 108 Calves are at risk of predation and a mother giraffe will stand over them and kick at an approaching predator 44 Females watching calving pools will only alert their own young if they detect a disturbance although the others will take notice and follow 108 Allo sucking where a calf will suckle a female other than its mother has been recorded in both wild and captive giraffes 109 110 Calves first ruminate at four to six months and stop nursing at six to eight months Young may not reach independence until they are 14 months old 51 49 Females become sexually mature when they are four years old while males become mature at four or five years Spermatogenesis in male giraffes begins at three to four years of age 111 Males must wait until they are at least seven years old to gain the opportunity to mate 44 Necking Here male South African giraffes engage in low intensity necking to establish dominance in Ithala Game Reserve Kwa Zulu Natal South Africa Male giraffes use their necks as weapons in combat a behaviour known as necking Necking is used to establish dominance and males that win necking bouts have greater reproductive success 12 This behaviour occurs at low or high intensity In low intensity necking the combatants rub and lean on each other The male that can keep itself more upright wins the bout In high intensity necking the combatants will spread their front legs and swing their necks at each other attempting to land blows with their ossicones The contestants will try to dodge each other s blows and then prepare to counter The power of a blow depends on the weight of the skull and the arc of the swing 44 A necking duel can last more than half an hour depending on how well matched the combatants are 34 331 Although most fights do not lead to serious injury there have been records of broken jaws broken necks and even deaths 12 After a duel it is common for two male giraffes to caress and court each other Such interactions between males have been found to be more frequent than heterosexual coupling 112 In one study up to 94 percent of observed mounting incidents took place between males The proportion of same sex activities varied from 30 to 75 percent Only one percent of same sex mounting incidents occurred between females 113 Mortality and health Lioness seen with an adult Masai giraffe kill Red billed oxpeckers on a giraffe ZambiaGiraffes have high adult survival probability 114 and an unusually long lifespan compared to other ruminants up to 38 years 115 Adult female survival is significantly correlated with the number of social associations 116 Because of their size eyesight and powerful kicks adult giraffes are mostly safe from predation 44 with lions being their only major threats 51 55 Calves are much more vulnerable than adults and are also preyed on by leopards spotted hyenas and wild dogs 52 A quarter to a half of giraffe calves reach adulthood 114 117 Calf survival varies according to the season of birth with calves born during the dry season having higher survival rates 118 The local seasonal presence of large herds of migratory wildebeests and zebras reduces predation pressure on giraffe calves and increases their survival probability 119 In turn it has been suggested that other ungulates may benefit from associating with giraffes as their height allows them to spot predators from further away Zebras were found to assess predation risk by watching giraffes and spend less time looking around when giraffes are present 120 Some parasites feed on giraffes They are often hosts for ticks especially in the area around the genitals which have thinner skin than other areas Tick species that commonly feed on giraffes are those of genera Hyalomma Amblyomma and Rhipicephalus Giraffes may rely on red billed and yellow billed oxpeckers to clean them of ticks and alert them to danger Giraffes host numerous species of internal parasites and are susceptible to various diseases They were victims of the now eradicated viral illness rinderpest 19 Giraffes can also suffer from a skin disorder which comes in the form of wrinkles lesions or raw fissures As much as 79 of giraffes have symptoms of the disease in Ruaha National Park but it did not cause mortality in Tarangire and is less prevalent in areas with fertile soils 121 122 123 Human relationsCultural significance With its lanky build and spotted coat the giraffe has been a source of fascination throughout human history and its image is widespread in culture It has represented flexibility far sightedness femininity fragility passivity grace beauty and the continent of Africa itself 124 7 116 San rock art in Namibia depicting a giraffeGiraffes were depicted in art throughout the African continent including that of the Kiffians Egyptians and Kushites 124 45 47 The Kiffians were responsible for a life size rock engraving of two giraffes dated 8 000 years ago that has been called the world s largest rock art petroglyph 124 45 125 How the giraffe got its height has been the subject of various African folktales 12 The Tugen people of modern Kenya used the giraffe to depict their god Mda 126 The Egyptians gave the giraffe its own hieroglyph sr in Old Egyptian and mmy in later periods 124 49 Giraffes have a presence in modern Western culture Salvador Dali depicted them with burning manes in some of his surrealist paintings Dali considered the giraffe to be a masculine symbol and a flaming giraffe was meant to be a masculine cosmic apocalyptic monster 124 123 Several children s books feature the giraffe including David A Ufer s The Giraffe Who Was Afraid of Heights Giles Andreae s Giraffes Can t Dance and Roald Dahl s The Giraffe and the Pelly and Me Giraffes have appeared in animated films as minor characters in Disney s The Lion King and Dumbo and in more prominent roles in The Wild and the Madagascar films Sophie the Giraffe has been a popular teether since 1961 Another famous fictional giraffe is the Toys R Us mascot Geoffrey the Giraffe 124 127 The giraffe has also been used for some scientific experiments and discoveries Scientists have used the properties of giraffe skin as a model for astronaut and fighter pilot suits because the people in these professions are in danger of passing out if blood rushes to their legs 49 76 Computer scientists have modeled the coat patterns of several subspecies using reaction diffusion mechanisms 127 The constellation of Camelopardalis introduced in the seventeenth century depicts a giraffe 124 119 20 The Tswana people of Botswana traditionally see the constellation Crux as two giraffes Acrux and Mimosa forming a male and Gacrux and Delta Crucis forming the female 128 Painting of a giraffe imported to China during the Ming dynastyCaptivity The Egyptians were among the earliest people to keep giraffes in captivity and shipped them around the Mediterranean 124 48 49 The giraffe was among the many animals collected and displayed by the Romans The first one in Rome was brought in by Julius Caesar in 46 BC 124 52 With the fall of the Western Roman Empire the housing of giraffes in Europe declined 124 54 During the Middle Ages giraffes were known to Europeans through contact with the Arabs who revered the giraffe for its peculiar appearance 52 Individual captive giraffes were given celebrity status throughout history In 1414 a giraffe from Malindi was taken to China by explorer Zheng He and placed in a Ming dynasty zoo The animal was a source of fascination for the Chinese people who associated it with the mythical Qilin 124 56 The Medici giraffe was a giraffe presented to Lorenzo de Medici in 1486 It caused a great stir on its arrival in Florence 129 Zarafa another famous giraffe was brought from Egypt to Paris in the early 19th century as a gift for Charles X of France A sensation the giraffe was the subject of numerous memorabilia or giraffanalia 124 81 Giraffes have become popular attractions in modern zoos though keeping them healthy is difficult as they require vast areas and need to eat large amounts of browse Captive giraffes in North America and Europe appear to have a higher mortality rate than in the wild the most common causes being poor husbandry nutrition and management 51 153 Giraffes in zoos display stereotypical behaviours particularly the licking of inanimate objects and pacing 51 164 Zookeepers may offer various activities to stimulate giraffes including training them to take food from visitors 51 167 176 Stables for giraffes are built particularly high to accommodate their height 51 183 Exploitation Giraffes were probably common targets for hunters throughout Africa 34 337 Different parts of their bodies were used for different purposes 19 Their meat was used for food The tail hairs served as flyswatters bracelets necklaces and threads Shields sandals and drums were made using the skin and the strings of musical instruments were from the tendons 19 34 337 In Buganda the smoke of burning giraffe skin was traditionally used to treat nose bleeds 34 337 The Humr people of Kordofan consume the drink Umm Nyolokh which is prepared from the liver and bone marrow of giraffes Richard Rudgley hypothesised that Umm Nyolokh might contain DMT 130 The drink is said to cause hallucinations of giraffes believed to be the giraffes ghosts by the Humr 131 Conservation statusIn 2016 giraffes were assessed as Vulnerable from a conservation perspective by the IUCN 1 In 1985 it was estimated there were 155 000 giraffes in the wild This declined to over 140 000 in 1999 30 Estimates as of 2016 indicate there are approximately 97 500 members of Giraffa in the wild 132 133 The Masai and reticulated subspecies are endangered 134 135 and the Rothschild subspecies is near threatened 33 The Nubian subspecies is critically endangered 136 Endangered West African giraffe near Koure NigerThe primary causes for giraffe population declines are habitat loss and direct killing for bushmeat markets Giraffes have been extirpated from much of their historic range including Eritrea Guinea Mauritania and Senegal 1 They may also have disappeared from Angola Mali and Nigeria but have been introduced to Rwanda and Eswatini 1 136 As of 2010 update there were more than 1 600 in captivity at Species360 registered zoos 28 Habitat destruction has hurt the giraffe In the Sahel the need for firewood and grazing room for livestock has led to deforestation Normally giraffes can coexist with livestock since they avoid direct competition by feeding above them 37 In 2017 severe droughts in northern Kenya led to increased tensions over land and the killing of wildlife by herders with giraffe populations being particularly hit 137 Protected areas like national parks provide important habitat and anti poaching protection to giraffe populations 1 Community based conservation efforts outside national parks are also effective at protecting giraffes and their habitats 138 139 Private game reserves have contributed to the preservation of giraffe populations in eastern and southern Africa 37 The giraffe is a protected species in most of its range It is the national animal of Tanzania 140 and is protected by law 141 and unauthorised killing can result in imprisonment 142 The UN backed Convention of Migratory Species selected giraffes for protection in 2017 143 In 2019 giraffes were listed under Appendix II of the Convention on International Trade in Endangered Species CITES which means international trade including in parts derivatives is regulated 144 Translocations are sometimes used to augment or re establish diminished or extirpated populations but these activities are risky and difficult to undertake using the best practices of extensive pre and post translocation studies and ensuring a viable founding population 145 146 Aerial survey is the most common method of monitoring giraffe population trends in the vast roadless tracts of African landscapes but aerial methods are known to undercount giraffes Ground based survey methods are more accurate and can be used in conjunction with aerial surveys to make accurate estimates of population sizes and trends 147 See alsoFauna of Africa Giraffe Centre Giraffe Manor hotel in Nairobi with giraffesReferences a b c d e f g h i j k l m n o p q r s t u v w x y Muller Z Bercovitch F Brand R Brown D Brown M Bolger D Carter K Deacon F Doherty J B Fennessy J Fennessy S Hussein A A Lee D Marais A Strauss M Tutchings A Wube T 2018 amended version of 2016 assessment Giraffa camelopardalis IUCN Red List of Threatened Species 2018 e T9194A136266699 doi 10 2305 IUCN UK 2016 3 RLTS T9194A136266699 en Retrieved 12 November 2021 a b Giraffe Online Etymology Dictionary Retrieved 1 November 2011 Dehkhoda Ali akbar زراف Dehkhoda Lexicon Institute and International Center for Persian Studies Retrieved 28 December 2022 Acaṙean Hracʿeay 1973 զուրափէ in Hayeren armatakan baṙaran Armenian Etymological Dictionary in Armenian volume II 2nd edition a reprint of the original 1926 1935 seven volume edition www nayiri com Yerevan University Press p 110a Retrieved 28 December 2022 Orsi Tibor 2006 French Linguistic Influence in the Cotton Version of Mandeville s Travels Tinta Konyvkiado p 113 ISBN 9789637094545 Definition of CAMELOPARD m w com Encyclopaedia Britannica Merriam Webster Retrieved 3 September 2014 Definition of camelopard Dictionary of Medieval Terms and Phrases Retrieved 3 September 2014 a b c d e f g h i j k l Mitchell G Skinner J D 2003 On the origin evolution and phylogeny of giraffes Giraffa camelopardalis Transactions of the Royal Society of South Africa 58 1 51 73 doi 10 1080 00359190309519935 S2CID 6522531 Chen L Qiu Q Jiang Y Wang K 2019 Large scale ruminant genome sequencing provides insights into their evolution and distinct traits Science 364 6446 eaav6202 Bibcode 2019Sci 364 6202C doi 10 1126 science aav6202 PMID 31221828 a b c d Danowitz M Vasilyev A Kortlandt V Solounias V 2015 Fossil evidence and stages of elongation of the Giraffa camelopardalis neck Royal Society Open Science 2 10 150393 Bibcode 2015RSOS 250393D doi 10 1098 rsos 150393 PMC 4632521 PMID 26587249 a b Danowitz M Domalski R Solounias N 2015 The cervical anatomy of Samotherium an intermediate necked giraffid Royal Society Open Science 2 11 150521 Bibcode 2015RSOS 250521D doi 10 1098 rsos 150521 PMC 4680625 PMID 26716010 a b c d e f g h Simmons R E Scheepers L 1996 Winning by a Neck Sexual Selection in the Evolution of Giraffe PDF The American Naturalist 148 5 771 86 doi 10 1086 285955 S2CID 84406669 Archived from the original PDF on 23 August 2004 Janis Christine M 1 January 1993 Tertiary Mammal Evolution in the Context of Changing Climates Vegetation and Tectonic Events Annual Review of Ecology and Systematics 24 467 500 doi 10 1146 annurev ecolsys 24 1 467 JSTOR 2097187 Ramstein Gilles Fluteau Frederic Besse Jean Joussaume Sylvie 24 April 1997 Effect of orogeny plate motion and land sea distribution on Eurasian climate change over the past 30 million years Nature 386 6627 788 795 Bibcode 1997Natur 386 788R doi 10 1038 386788a0 S2CID 4335003 a b c d Badlangana L N Adams J W Manger P R 2009 The giraffe Giraffa camelopardalis cervical vertebral column A heuristic example in understanding evolutionary processes Zoological Journal of the Linnean Society 155 3 736 57 doi 10 1111 j 1096 3642 2008 00458 x a b Holmes Bob 19 May 2021 Heads up The cardiovascular secrets of giraffes Knowable Magazine doi 10 1146 knowable 051821 2 S2CID 236354545 Retrieved 1 August 2022 Agaba M Ishengoma E Miller W C McGrath B C Hudson C N Bedoya R O C Ratan A Burhans R Chikhi R Medvedev P Praul C A Wu Cavener L Wood B Robertson H Penfold L Cavener D R 2016 Giraffe genome sequence reveals clues to its unique morphology and physiology Nature Communications 7 11519 Bibcode 2016NatCo 711519A doi 10 1038 ncomms11519 PMC 4873664 PMID 27187213 a b Brown D M Brenneman R A Koepfli K P Pollinger J P Mila B Georgiadis N J Louis Jr E E Grether G F Jacobs D K Wayne R K 2007 Extensive population genetic structure in the giraffe BMC Biology 5 1 57 doi 10 1186 1741 7007 5 57 PMC 2254591 PMID 18154651 a b c d e f g h i j k l m n o Dagg A I 1971 Giraffa camelopardalis PDF Mammalian Species 5 1 8 doi 10 2307 3503830 JSTOR 3503830 Archived from the original PDF on 21 April 2017 Retrieved 25 October 2011 Gippoliti S 2018 Impacts of taxonomic inertia for the conservation of African ungulate diversity an overview Biological Reviews 93 1 115 130 doi 10 1111 brv 12335 PMID 28429851 S2CID 5189968 a b Groves Colin Grubb Peter 2011 Ungulate Taxonomy JHU Press pp 68 70 ISBN 9781421400938 a b c Fennessy Julian Bidon Tobias Reuss Friederike Kumar Vikas Elkan Paul Nilsson Maria A Vamberger Melita Fritz Uwe Janke Axel 2016 Multi locus Analyses reveal four giraffe species instead of one Current Biology 26 18 2543 2549 doi 10 1016 j cub 2016 07 036 PMID 27618261 S2CID 3991170 a b c Petzold Alice Hassanin Alexandre 13 February 2020 A comparative approach for species delimitation based on multiple methods of multi locus DNA sequence analysis A case study of the genus Giraffa Mammalia Cetartiodactyla PLOS ONE 15 2 e0217956 Bibcode 2020PLoSO 1517956P doi 10 1371 journal pone 0217956 ISSN 1932 6203 PMC 7018015 PMID 32053589 a b c Coimbra Raphael T F Winter Sven Kumar Vikas Koepfli Klaus Peter Gooley Rebecca M Dobrynin Pavel Fennessy Julian Janke Axel 2021 Whole genome analysis of giraffe supports four distinct species Current Biology 31 13 2929 2938 e5 doi 10 1016 j cub 2021 04 033 ISSN 0960 9822 PMID 33957077 a b Linnaeus Carl 1758 Systema Naturae a b c Hassanin A Ropiquet A Gourmand B L Chardonnet B Rigoulet J 2007 Mitochondrial DNA variability in Giraffa camelopardalis consequences for taxonomy phylogeography and conservation of giraffes in West and central Africa Comptes Rendus Biologies 330 3 173 83 doi 10 1016 j crvi 2007 02 008 PMID 17434121 a b c d e f g h i Seymour R 2002 The taxonomic status of the giraffe Giraffa camelopardalis L 1758 Ph D thesis a b c d e f g h Giraffa ISIS 2010 Archived from the original on 6 July 2010 Retrieved 4 November 2010 Swaison 1835 Camelopardalis antiquorum Bagger el Homer Kordofan about 10 N 28 E as fixed by Harper 1940 a b Giraffe The Facts Current giraffe status Giraffe Conservation Foundation Archived from the original on 19 March 2016 Retrieved 21 December 2010 Exhibits Al Ain Zoo 25 February 2003 Archived from the original on 29 November 2011 Retrieved 21 November 2011 Nubian giraffe born in Al Ain zoo UAE Interact Archived from the original on 20 March 2012 Retrieved 21 December 2010 a b Fennessy S Fennessy J Muller Z Brown M Marais A 2018 Giraffa camelopardalis ssp rothschildi IUCN Red List of Threatened Species 2018 e T174469A51140829 doi 10 2305 IUCN UK 2018 2 RLTS T174469A51140829 en Retrieved 19 November 2021 a b c d e f g h i j k Kingdon J 1988 East African Mammals An Atlas of Evolution in Africa Volume 3 Part B Large Mammals University of Chicago Press pp 313 37 ISBN 978 0 226 43722 4 Fennessy J Marais A Tutchings A 2018 Giraffa camelopardalis ssp peralta IUCN Red List of Threatened Species 2018 e T136913A51140803 Winton W E de 1 November 1899 XXXVIII On mammals collected by Lieut Colonel W Giffard in the northern territory of the Gold Coast Annals and Magazine of Natural History 4 23 353 359 doi 10 1080 00222939908678212 ISSN 0374 5481 a b c d e f g h i Pellow R A 2001 Giraffe and Okapi In MacDonald D ed The Encyclopedia of Mammals 2nd ed Oxford University Press pp 520 27 ISBN 978 0 7607 1969 5 For the first time in decades Angolan giraffes now populate a park in Angola Megan Lim NPR 2023 07 11 a b Bock Friederike Fennessy Julian Bidon Tobias Tutchings Andy Marais Andri Deacon Francois Janke Axel 23 October 2014 Mitochondrial sequences reveal a clear separation between Angolan and South African giraffe along a cryptic rift valley BMC Evolutionary Biology 14 1 219 doi 10 1186 s12862 014 0219 7 ISSN 1471 2148 PMC 4207324 PMID 25927851 a b Winter Sven Fennessy Julian Fennessy Stephanie Janke Axel 1 July 2018 Matrilineal population structure and distribution of the Angolan giraffe in the Namib desert and beyond Ecological Genetics and Genomics 7 8 1 5 doi 10 1016 j egg 2018 03 003 ISSN 2405 9854 S2CID 90395544 Brenneman R A Louis E E Jr Fennessy J 2009 Genetic structure of two populations of the Namibian giraffe Giraffa camelopardalis angolensis African Journal of Ecology 47 4 720 28 doi 10 1111 j 1365 2028 2009 01078 x Rookmaaker L C 1 June 1989 The Zoological Exploration of Southern Africa 1650 1790 CRC Press ISBN 9789061918677 a b Lee Derek E Cavener Douglas R Bond Monica L 2 October 2018 Seeing spots quantifying mother offspring similarity and assessing fitness consequences of coat pattern traits in a wild population of giraffes Giraffa camelopardalis PeerJ 6 e5690 doi 10 7717 peerj 5690 ISSN 2167 8359 PMC 6173159 PMID 30310743 a b c d e f g h i j k l m n o p q r s t Estes R 1992 The Behavior Guide to African Mammals including Hoofed Mammals Carnivores Primates University of California Press pp 202 07 ISBN 978 0 520 08085 0 van Sittert Sybrand J Mitchell Graham 4 August 2015 On reconstructing Giraffa sivalensis an extinct giraffid from the Siwalik Hills India PeerJ 3 e1135 doi 10 7717 peerj 1135 PMC 4540016 PMID 26290791 Giraffa Brisson 1762 giraffe paleobiodb org Retrieved 9 December 2021 a b Nowak R M 1999 Walker s Mammals of the World Volume 1 The Johns Hopkins University Press pp 1086 1089 ISBN 978 0801857898 a b Skinner J D Smithers R H M 1990 The mammals of the southern African subregion University of Pretoria pp 616 20 ISBN 978 0 521 84418 5 a b c d e f g h Swaby S 2010 Giraffe In Harris T ed Mammal Anatomy An Illustrated Guide Marshall Cavendish pp 64 84 ISBN 978 0 7614 7882 9 Langley Liz 4 March 2017 Do Zebras Have Stripes On Their Skin National Geographic Retrieved 2 June 2020 a b c d e f g h i j k l m n o p q r s t Dagg A I 2014 Giraffe Biology Behaviour and Conservation Cambridge University Press ISBN 978 1107610170 a b c d e f g Prothero D R Schoch R M 2003 Horns Tusks and Flippers The Evolution of Hoofed Mammals Johns Hopkins University Press pp 67 72 ISBN 978 0 8018 7135 1 Foster J B August 1966 The Giraffe of Nairobi National Park Home Range Sex Ratios the Herd and Food African Journal of Ecology 4 1 139 148 doi 10 1111 j 1365 2028 1966 tb00889 x Lee Derek E Lohay George G Cavener Douglas R Bond Monica L 6 September 2022 Using spot pattern recognition to examine population biology evolutionary ecology sociality and movements of giraffes a 70 year retrospective Mammalian Biology 102 4 1055 1071 doi 10 1007 s42991 022 00261 3 ISSN 1618 1476 S2CID 252149865 a b c Mitchell G Skinner J D 2004 Giraffe thermoregulation a review Transactions of the Royal Society of South Africa 59 2 49 57 doi 10 1080 00359190409519170 ISSN 0035 919X S2CID 87321176 Wood W F Weldon P J 2002 The scent of the reticulated giraffe Giraffa camelopardalis reticulata Biochemical Systematics and Ecology 30 10 913 17 doi 10 1016 S0305 1978 02 00037 6 a b c d Simmons R E Altwegg R 2010 Necks for sex or competing browsers A critique of ideas on the evolution of giraffe Journal of Zoology 282 1 6 12 doi 10 1111 j 1469 7998 2010 00711 x Mitchell G Roberts D G van Sittert S J Skinner J D 2013 Orbit orientation and eye morphometrics in giraffes Giraffa camelopardalis African Zoology 48 2 333 339 doi 10 1080 15627020 2013 11407600 hdl 2263 37109 S2CID 219292664 Peterson D 2013 Giraffe Reflections University of California Press p 30 ISBN 978 0520266858 Taylor M P Wedel M J 2013 Why sauropods had long necks and why giraffes have short necks PeerJ 1 e36 doi 10 7717 peerj 36 PMC 3628838 PMID 23638372 a b Van Sittert S J Skinner J D Mitchell G 2010 From fetus to adult An allometric analysis of the giraffe vertebral column Journal of Experimental Zoology Part B Molecular and Developmental Evolution 314B 6 469 79 doi 10 1002 jez b 21353 PMID 20700891 a b Solounias N 1999 The remarkable anatomy of the giraffe s neck PDF Journal of Zoology 247 2 257 68 doi 10 1111 j 1469 7998 1999 tb00989 x Archived PDF from the original on 25 March 2009 a b du Toit J T 1990 Feeding height stratification among African browsing ruminants PDF African Journal of Ecology 28 1 55 62 doi 10 1111 j 1365 2028 1990 tb01136 x Archived from the original PDF on 10 November 2011 Retrieved 21 November 2011 Cameron E Z du Toit J T 2007 Winning by a Neck Tall Giraffes Avoid Competing with Shorter Browsers American Naturalist 169 1 130 35 doi 10 1086 509940 PMID 17206591 S2CID 52838493 Woolnough A P du Toit J T 2001 Vertical zonation of browse quality in tree canopies exposed to a size structured guild of African browsing ungulates PDF Oecologia 129 1 585 90 Bibcode 2001Oecol 129 585W doi 10 1007 s004420100771 PMID 24577699 S2CID 18821024 Archived from the original PDF on 10 November 2011 Retrieved 7 March 2012 a b Young T P Isbell L A 1991 Sex differences in giraffe feeding ecology energetic and social constraints PDF Ethology 87 1 2 79 89 doi 10 1111 j 1439 0310 1991 tb01190 x Archived from the original PDF on 16 May 2013 Retrieved 2 February 2012 Mitchell G van Sittert S Skinner J D 2010 The demography of giraffe deaths in a drought Transactions of the Royal Society of South Africa 65 3 165 68 doi 10 1080 0035919X 2010 509153 hdl 2263 18957 S2CID 83652889 Mitchell G van Sittert S J Skinner J D 2009 Sexual selection is not the origin of long necks in giraffes Journal of Zoology 278 4 281 86 doi 10 1111 j 1469 7998 2009 00573 x Brownlee A 1963 Evolution of the Giraffe Nature 200 4910 1022 Bibcode 1963Natur 200 1022B doi 10 1038 2001022a0 S2CID 4145785 Williams Edgar M 2016 Giraffe Stature and Neck Elongation Vigilance as an Evolutionary Mechanism Biology 5 3 35 doi 10 3390 biology5030035 PMC 5037354 PMID 27626454 MacClintock D Mochi U 1973 A natural history of giraffes Scribner p 30 ISBN 978 0 684 13239 6 Wood C 7 March 2014 Groovy giraffes distinct bone structures keep these animals upright Society for Experimental Biology Retrieved 7 May 2014 Garland T Janis C M 1993 Does metatarsal femur ratio predict maximal running speed in cursorial mammals PDF Journal of Zoology 229 1 133 51 doi 10 1111 j 1469 7998 1993 tb02626 x Archived from the original PDF on 20 November 2018 Retrieved 25 April 2010 Rafferty John P 2011 Grazers Britannica Guide to Predators and Prey Britannica Educational Publishing p 194 ISBN 978 1 61530 336 6 a b c Henderson D M Naish D 2010 Predicting the buoyancy equilibrium and potential swimming ability of giraffes by computational analysis Journal of Theoretical Biology 265 2 151 59 Bibcode 2010JThBi 265 151H doi 10 1016 j jtbi 2010 04 007 PMID 20385144 a b Naish D January 2011 Will it Float Scientific American 304 1 22 Bibcode 2011SciAm 304a 22N doi 10 1038 scientificamerican0111 22 ISSN 0036 8733 Tobler I Schwierin B 1996 Behavioural sleep in the giraffe Giraffa camelopardalis in a zoological garden Journal of Sleep Research 5 1 21 32 doi 10 1046 j 1365 2869 1996 00010 x PMID 8795798 S2CID 34605791 a b Wedel M J 2012 A monument of inefficiency the presumed course of the recurrent laryngeal nerve in sauropod dinosaurs PDF Acta Palaeontologica Polonica 57 2 251 56 doi 10 4202 app 2011 0019 S2CID 43447891 Archived PDF from the original on 29 October 2013 Harrison D F N 1995 The Anatomy and Physiology of the Mammalian Larynx Cambridge University Press p 165 ISBN 978 0 521 45321 9 Graic J M Peruffo A Ballarin C Cozzi B 2017 The brain of the giraffe Giraffa camelopardalis surface configuration encephalization quotient and analysis of the existing literature The Anatomical Record 300 8 1502 1511 doi 10 1002 ar 23593 PMID 28346748 S2CID 3634656 Skinner J D Mitchell G 2011 Lung volumes in giraffes Giraffa camelopardalis PDF Comparative Biochemistry and Physiology A 158 1 72 78 doi 10 1016 j cbpa 2010 09 003 hdl 2263 16472 PMID 20837156 Mitchell G Skinner J D 1993 How giraffe adapt to their extraordinary shape Transactions of the Royal Society of South Africa 48 2 207 18 doi 10 1080 00359199309520271 Mitchell G van Sittert S J Skinner J D 2009 The structure and function of giraffe jugular vein valves PDF South African Journal of Wildlife Research 39 2 175 80 doi 10 3957 056 039 0210 hdl 2263 13994 S2CID 55201969 Perez W Lima M Clauss M 2009 Gross anatomy of the intestine in the giraffe Giraffa camelopardalis PDF Anatomia Histologia Embryologia 38 6 432 35 doi 10 1111 j 1439 0264 2009 00965 x PMID 19681830 S2CID 28390695 Archived PDF from the original on 22 July 2018 Cave A J E 1950 On the liver and gall bladder of the Giraffe Proceedings of the Zoological Society of London 120 2 381 93 doi 10 1111 j 1096 3642 1950 tb00956 x Oldham Ott Carla K Gilloteaux Jacques 1997 Comparative morphology of the gallbladder and biliary tract in vertebrates variation in structure homology in function and gallstones Microscopy Research and Technique 38 6 571 79 doi 10 1002 SICI 1097 0029 19970915 38 6 lt 571 AID JEMT3 gt 3 0 CO 2 I PMID 9330347 S2CID 20040338 Fennessy J 2004 Ecology of desert dwelling giraffeGiraffa camelopardalis angolensisin northwestern Namibia PhD thesis University of Sydney a b c Kingdon J 1997 The Kingdon Field Guide to African Mammals Academic Press pp 339 44 ISBN 978 0 12 408355 4 a b Bond Monica L Lee Derek E Ozgul Arpat Konig Barbara 27 August 2019 Fission fusion dynamics of a megaherbivore are driven by ecological anthropogenic temporal and social factors Oecologia 191 2 335 347 Bibcode 2019Oecol 191 335B doi 10 1007 s00442 019 04485 y ISSN 1432 1939 PMID 31451928 S2CID 201732871 van der Jeugd H P Prins H H T 2000 Movements and group structure of giraffe Giraffa camelopardalis in Lake Manyara National Park Tanzania PDF Journal of Zoology 251 1 15 21 doi 10 1111 j 1469 7998 2000 tb00588 x Archived from the original PDF on 6 November 2013 a b c d e f Pratt D M Anderson V H 1985 Giraffe social behavior Journal of Natural History 19 4 771 81 doi 10 1080 00222938500770471 a b Bond Monica L Konig Barbara Lee Derek E Ozgul Arpat Farine Damien R 2020 Proximity to humans affects local social structure in a giraffe metapopulation Journal of Animal Ecology 90 1 212 221 doi 10 1111 1365 2656 13247 ISSN 1365 2656 PMID 32515083 Bercovitch F B Berry P S M 2013 Herd composition kinship and fission fusion social dynamics among wild giraffe African Journal of Ecology 51 2 206 216 doi 10 1111 aje 12024 a b Carter K D Seddon J M Frereb C H Carter J K 2013 Fission fusion dynamics in wild giraffes may be driven by kinship spatial overlap and individual social preferences Animal Behaviour 85 2 385 394 doi 10 1016 j anbehav 2012 11 011 S2CID 53176817 a b c d e VanderWaal K L Wang H McCowan B Fushing H Isbell L A 2014 Multilevel social organization and space use in reticulated giraffe Giraffa camelopardalis Behavioral Ecology 25 1 17 26 doi 10 1093 beheco art061 Bond Monica L Konig Barbara Ozgul Arpat Farine Damien R Lee Derek E 2021 Socially Defined Subpopulations Reveal Demographic Variation in a Giraffe Metapopulation The Journal of Wildlife Management 85 5 920 931 doi 10 1002 jwmg 22044 ISSN 1937 2817 S2CID 233600744 Bond Monica L Lee Derek E Ozgul Arpat Farine Damien R Konig Barbara December 2021 Leaving by staying Social dispersal in giraffes Journal of Animal Ecology 90 12 2755 2766 doi 10 1111 1365 2656 13582 ISSN 0021 8790 PMC 9291750 Lavista Ferres Juan M Lee Derek E Nasir Md Chen Yu Chia Bijral Avleen S Bercovitch Fred B Bond Monica L 1 October 2021 Social connectedness and movements among communities of giraffes vary by sex and age class Animal Behaviour 180 315 328 doi 10 1016 j anbehav 2021 08 008 ISSN 0003 3472 S2CID 237949827 a b c d Leuthold B M 1979 Social organization and behaviour of giraffe in Tsavo East National Park African Journal of Ecology 17 1 19 34 doi 10 1111 j 1365 2028 1979 tb00453 x Knusel Mara Lee Derek Konig Barbara Bond Monica March 2019 Correlates of home range sizes of giraffes Giraffa camelopardalis PDF Animal Behaviour 149 143 151 doi 10 1016 j anbehav 2019 01 017 S2CID 72332291 Archived PDF from the original on 10 February 2020 a b Kasozi H Montgomery R A 2018 How do giraffes locate one another A review of visual auditory and olfactory communication among giraffes Journal of Zoology 306 3 139 146 doi 10 1111 jzo 12604 Volodina Elena V Volodin Ilya A Chelysheva Elena V Frey Roland 2018 Hiss and snort call types of wild living giraffes Giraffa camelopardalis acoustic structure and context BMC Research Notes 11 12 12 doi 10 1186 s13104 017 3103 x PMC 5761111 PMID 29316966 Baotic A Sicks F Stoeger A S 2015 Nocturnal humming vocalizations adding a piece to the puzzle of giraffe vocal communication BMC Research Notes 8 425 doi 10 1186 s13104 015 1394 3 PMC 4565008 PMID 26353836 Von Muggenthaler E 2013 Giraffe Helmholtz resonance Proceedings of Meetings on Acoustics 19 1 010012 doi 10 1121 1 4800658 a b del Castillo Susan M Bashaw Meredith J Patton Marilyn L Rieches Randy R Bercovitch Fred B 1 May 2005 Fecal steroid analysis of female giraffe Giraffa camelopardalis reproductive condition and the impact of endocrine status on daily time budgets General and Comparative Endocrinology 141 3 271 281 doi 10 1016 j ygcen 2005 01 011 ISSN 0016 6480 PMID 15804514 Bercovitch Fred B Bashaw Meredith J del Castillo Susan M 1 August 2006 Sociosexual behavior male mating tactics and the reproductive cycle of giraffe Giraffa camelopardalis Hormones and Behavior 50 2 314 321 doi 10 1016 j yhbeh 2006 04 004 ISSN 0018 506X PMID 16765955 S2CID 45843281 Seeber Peter A Duncan Patrick Fritz Herve Ganswindt Andre 23 October 2013 Androgen changes and flexible rutting behaviour in male giraffes Biology Letters 9 5 20130396 doi 10 1098 rsbl 2013 0396 PMC 3971675 PMID 23925833 a b c Langman V A 1977 Cow calf relationships in giraffe Giraffa camelopardalis giraffa Zeitschrift fur Tierpsychologie 43 3 264 86 doi 10 1111 j 1439 0310 1977 tb00074 x Saito M Idani G 2018 Suckling and allosuckling behavior in wild giraffe Giraffa camelopardalis tippelskirchi Mammalian Biology 93 1 4 doi 10 1016 j mambio 2018 07 005 S2CID 91472891 Glonekova M Brandlova K Pluhacek J 2021 Further behavioural parameters support reciprocity and milk theft as explanations for giraffe allonursing Scientific Reports 11 1 7024 Bibcode 2021NatSR 11 7024G doi 10 1038 s41598 021 86499 2 PMC 8007720 PMID 33782483 Hall Martin A J Skinner J D Hopkins B J 1978 The development of the reproductive organs of the male giraffe Giraffa camelopardalis PDF Journal of Reproduction and Fertility 52 1 1 7 doi 10 1530 jrf 0 0520001 PMID 621681 Coe M J 1967 Necking behavior in the giraffe Journal of Zoology 151 2 313 21 doi 10 1111 j 1469 7998 1967 tb02117 x Bagemihl B 1999 Biological Exuberance Animal Homosexuality and Natural Diversity St Martin s Press pp 391 93 ISBN 978 0 312 19239 6 a b Lee D E Strauss M K L 1 January 2016 Reference Module in Earth Systems and Environmental Sciences Elsevier doi 10 1016 B978 0 12 409548 9 09721 9 ISBN 9780124095489 Muller DW Zerbe P Codron D Clauss M Hatt JM 2011 A long life among ruminants giraffids and other special cases Schweizer Archiv fur Tierheilkunde 153 11 515 519 doi 10 1024 0036 7281 a000263 PMID 22045457 S2CID 10687135 Bond M L Lee D E Farine D R Ozgul A Konig B 10 February 2021 Sociability increases survival of adult female giraffes Proceedings of the Royal Society B Biological Sciences 288 1944 20202770 doi 10 1098 rspb 2020 2770 PMC 7893237 PMID 33563118 Lee Derek E Bond Monica L Kissui Bernard M Kiwango Yustina A Bolger Douglas T 11 May 2016 Spatial variation in giraffe demography a test of 2 paradigms Journal of Mammalogy 97 4 1015 1025 doi 10 1093 jmammal gyw086 ISSN 0022 2372 S2CID 87117946 Lee Derek Edward Bond Monica Louise Bolger Douglas Thomas 1 January 2017 Season of birth affects juvenile survival of giraffe Population Ecology 59 1 45 54 doi 10 1007 s10144 017 0571 8 ISSN 1438 3896 S2CID 7611046 Lee Derek E Kissui Bernard M Kiwango Yustina A Bond Monica L 2016 Migratory herds of wildebeests and zebras indirectly affect calf survival of giraffes Ecology and Evolution 6 23 8402 8411 doi 10 1002 ece3 2561 ISSN 2045 7758 PMC 5167056 PMID 28031792 Schmitt M H Stears K Shrader A M 2016 Zebra reduce predation risk in mixed species herds by eavesdropping on cues from giraffe Behavioral Ecology 27 4 1073 1077 doi 10 1093 beheco arw015 Lee Derek E Bond Monica L 26 July 2016 The Occurrence and Prevalence of Giraffe Skin Disease in Protected Areas of Northern Tanzania Journal of Wildlife Diseases 52 3 753 755 doi 10 7589 2015 09 247 PMID 27310168 S2CID 10736316 Bond Monica L Strauss Megan K L Lee Derek E 16 August 2016 Soil Correlates and Mortality from Giraffe Skin Disease in Tanzania Journal of Wildlife Diseases 52 4 953 958 doi 10 7589 2016 02 047 ISSN 0090 3558 PMID 27529292 S2CID 46776142 Muneza Arthur B Montgomery Robert A Fennessy Julian T Dickman Amy J Roloff Gary J Macdonald David W 1 June 2016 Regional variation of the manifestation prevalence and severity of giraffe skin disease A review of an emerging disease in wild and captive giraffe populations Biological Conservation 198 145 156 doi 10 1016 j biocon 2016 04 014 a b c d e f g h i j k l Williams E 2011 Giraffe Reaktion Books ISBN 978 1 86189 764 0 The Dabous Giraffe rock art petrograph The Bradshaw Foundation Retrieved 6 November 2011 Shorrocks B 2016 The Giraffe Biology Ecology Evolution and Behaviour Wiley p 3 ISBN 9781118587478 Walter M Fournier A Menevaux D 2001 Integrating shape and pattern in mammalian models PDF Proceedings of the 28th annual conference on Computer graphics and interactive techniques pp 317 26 CiteSeerX 10 1 1 10 7622 doi 10 1145 383259 383294 ISBN 978 1 58113 374 5 S2CID 13488215 Archived from the original on 23 September 2015 Retrieved 16 November 2011 Clegg A 1986 Some Aspects of Tswana Cosmology Botswana Notes and Records 18 33 37 JSTOR 40979758 Ringmar E 2006 Audience for a Giraffe European Expansionism and the Quest for the Exotic PDF Journal of World History 17 4 353 97 doi 10 1353 jwh 2006 0060 JSTOR 20079397 S2CID 143808549 Archived PDF from the original on 10 September 2008 Rudgley Richard The Encyclopedia of Psychoactive Substances pub Abacus 1998 ISBN 0 349 11127 8 pps 20 21 Ian Cunnison 1958 Giraffe hunting among the Humr tribe Sudan Notes and Records 39 Matt McGrath 8 December 2016 Giraffes facing silent extinction as population plunges BBC News Retrieved 8 December 2016 New bird species and giraffe under threat IUCN Red List 8 December 2016 Bolger D Ogutu J Strauss M Lee D Muneza A Fennessy J Brown D 2019 Masai Giraffe IUCN Red List of Threatened Species 2019 doi 10 2305 IUCN UK 2019 1 RLTS T88421036A88421121 en Muneza A Doherty J B Hussein Ali A Fennessy J Marais A O Connor D Wube T 2018 Reticulated Giraffe IUCN Red List of Threatened Species 2018 doi 10 2305 IUCN UK 2018 2 RLTS T88420717A88420720 en a b Wube T Doherty J B Fennessy J Marais A 2018 Giraffa camelopardalis ssp camelopardalis IUCN Red List of Threatened Species 2018 doi 10 2305 IUCN UK 2018 2 RLTS T88420707A88420710 en Qiu Jane 2017 Surge in wildlife killings is wiping out giraffes Science doi 10 1126 science aan7000 Lee Derek E 2018 Evaluating conservation effectiveness in a Tanzanian community wildlife management area The Journal of Wildlife Management 82 8 1767 1774 doi 10 1002 jwmg 21549 ISSN 1937 2817 S2CID 91251633 Lee Derek E Bond Monica L 2018 Quantifying the ecological success of a community based wildlife conservation area in Tanzania Journal of Mammalogy 99 2 459 464 doi 10 1093 jmammal gyy014 ISSN 0022 2372 PMC 5965405 PMID 29867255 Knappert J 1987 East Africa Kenya Tanzania amp Uganda Vikas Publishing House p 57 ISBN 978 0 7069 2822 8 Charles Foley Lara Foley Alex Lobora Daniela De Luca Maurus Msuha Tim R B Davenport Sarah M Durant 2014 A Field Guide to the Larger Mammals of Tanzania Princeton University Press pp 179 ISBN 978 1 4008 5280 2 National Symbols National Animal tanzania go tz Tanzania Government Portal Archived from the original on 18 January 2015 Retrieved 14 January 2015 Chimpanzees among 33 breeds selected for special protection BBC News 28 October 2017 Retrieved 30 October 2017 Good News for Giraffes at CITES CoP18 gt Newsroom newsroom wcs org Retrieved 16 November 2020 Muller Zoe Lee Derek E Scheijen Ciska P J Strauss Megan K L Carter Kerryn D Deacon Francois 2020 Giraffe translocations A review and discussion of considerations African Journal of Ecology 58 2 159 171 doi 10 1111 aje 12727 Lee De Fienieg E Van Oosterhout C Muller Z Strauss M Carter Kd Scheijen Cpj Deacon F 27 February 2020 Giraffe translocation population viability analysis Endangered Species Research 41 245 252 doi 10 3354 esr01022 Lee Derek E Bond Monica L 2016 Precision accuracy and costs of survey methods for giraffe Giraffa camelopardalis Journal of Mammalogy 97 3 940 948 doi 10 1093 jmammal gyw025 S2CID 87384776 External links Wikimedia Commons has media related to Giraffa Official website of the Giraffe Conservation Foundation Retrieved from https en wikipedia org w index php title Giraffe amp oldid 1171592408, wikipedia, wiki, book, books, library,

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