East African oryx: Difference between revisions
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The '''East African oryx''' (''Oryx beisa''), also known as the '''beisa'''<ref name=msw3>{{MSW3 Grubb|id=14200953}}</ref> is a species of [[antelope]] from [[East Africa]]. It has two [[subspecies]]: the [[common beisa oryx]] (''Oryx beisa beisa'') found in [[steppe]] and semidesert throughout the [[Horn of Africa]] and north of the [[Tana River (Kenya)|Tana River]], and the [[fringe-eared oryx]] (''Oryx beisa callotis'') south of the Tana River in southern [[Kenya]] and parts of [[Tanzania]]. In the past, some [[Taxonomy (biology)|taxonomists]] considered it a subspecies of the [[gemsbok]] (''Oryx gazella''), but they are genetically distinct; the [[Ploidy#Diploid|diploid chromosome]] count is 56 for the beisa and 58 for the gemsbok.{{Citation needed|date=October 2010}} The species is listed as Endangered by the IUCN. |
The '''East African oryx''' (''Oryx beisa''), also known as the '''beisa'''<ref name=msw3>{{MSW3 Grubb|id=14200953}}</ref> is a species of [[antelope]] from [[East Africa]]. It has two [[subspecies]]: the [[common beisa oryx]] (''Oryx beisa beisa'') found in [[steppe]] and semidesert throughout the [[Horn of Africa]] and north of the [[Tana River (Kenya)|Tana River]], and the [[fringe-eared oryx]] (''Oryx beisa callotis'') south of the Tana River in southern [[Kenya]] and parts of [[Tanzania]]. In the past, some [[Taxonomy (biology)|taxonomists]] considered it a subspecies of the [[gemsbok]] (''Oryx gazella''), but they are genetically distinct; the [[Ploidy#Diploid|diploid chromosome]] count is 56 for the beisa and 58 for the gemsbok.{{Citation needed|date=October 2010}} The species is listed as Endangered by the IUCN. |
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==Description== |
==Description== |
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Revision as of 23:52, 7 July 2019
| East African oryx | |
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_female.jpg)
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| O. b. beisa (female) Awash National Park, Ethiopia | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Artiodactyla |
| Family: | Bovidae |
| Subfamily: | Hippotraginae |
| Genus: | Oryx |
| Species: | O. beisa
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| Binomial name | |
| Oryx beisa Rüppell, 1835
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| Subspecies | |
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| East African oryx range.[2] | |
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| Enlarged distribution map.[2][3] | |
The East African oryx (Oryx beisa), also known as the beisa[4] is a species of antelope from East Africa. It has two subspecies: the common beisa oryx (Oryx beisa beisa) found in steppe and semidesert throughout the Horn of Africa and north of the Tana River, and the fringe-eared oryx (Oryx beisa callotis) south of the Tana River in southern Kenya and parts of Tanzania. In the past, some taxonomists considered it a subspecies of the gemsbok (Oryx gazella), but they are genetically distinct; the diploid chromosome count is 56 for the beisa and 58 for the gemsbok.[citation needed] The species is listed as Endangered by the IUCN.
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Description
The East African oryx stands just over a metre at the shoulder and weighs around 175 lb (79 kg). It has a grey coat with a white underside, separated from the grey by a stripe of black, with black stripes where the head attaches to the neck, along the nose, and from the eye to the mouth and on the forehead. The mane is small and chestnut-coloured; the ringed horns are thin and straight. They are found on both sexes and typically measure 75–80 cm (30–31 in). Comparably, the gemsbok has an entirely black tail, a black patch at the base of the tail, and more black on the legs (including a patch on the hindlegs) and lower flanks. The smaller Arabian oryx is overall whiter with largely dark legs.
East African oryx live in semidesert and steppes, where they eat grasses, leaves, fruit and buds. They are able to store water by raising their body temperatures (so as to avoid perspiration). They gather in herds of five to 40 animals, often with females moving at the front and a large male guarding from the rear. Some older males are solitary. Radio tracking studies show the solitary males are often accompanied for brief periods by breeding-condition females, so it is probable they are executing a strategy to maximise their chances of reproduction.
Gallery
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Fringe-eared oryx (O. b. callotis) -
Common beisa oryx (O. b. beisa) -
Illustration -
In captivity
.jpg)
_Oryx_beisa.png)
References
- ^ IUCN SSC Antelope Specialist Group. 2018. Oryx beisa. The IUCN Red List of Threatened Species 2018: e.T15571A50191877. https://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T15571A50191877.en. Downloaded on 18 December 2018.
- ^ a b IUCN (International Union for Conservation of Nature) 2008. Oryx beisa. In: IUCN 2015. The IUCN Red List of Threatened Species. Version 2015.2. "Archived copy". Archived from the original on 27 June 2014. Retrieved 2014-06-27.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help)CS1 maint: archived copy as title (link). Downloaded on 14 July 2015. - ^ National Geophysical Data Center, 1999. Global Land One-kilometer Base Elevation (GLOBE) v.1. Hastings, D. and P.K. Dunbar. National Geophysical Data Center, NOAA. doi:10.7289/V52R3PMS [access date: 2015-03-16].
- ^ Grubb, P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore, MD: Johns Hopkins University Press. ISBN 0-8018-8221-4. OCLC 62265494.