African Wild Ass
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| Image:Somali Wild Ass.JPG Somali Wild Ass (Equus africanus somalicus) in St. Louis Zoo
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| Equus africanus | ||||||||||||||||
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The African Wild Ass (Equus africanus) is a wild member of the horse family, Equidae. This species is believed to be the ancestor of the domestic donkey Equus asinus, which is usually placed within the same species. The species name for the African Wild Ass is sometimes designated as africanus. They live in the grasslands and other arid areas of eastern Africa, in Eritrea, Ethiopia and Somalia; it formerly had a wider range north and west into Sudan, Egypt and Libya.
The African Wild Ass is 2 m long and 1.25-1.45 m tall at the shoulders, with a tail 30-50 cm long. It weighs between 230-275 kg. The short, smooth coat is a light grey to fawn colour, fading quickly to white on the undersides and legs. There is a slender, dark dorsal stripe in all subspecies, while in the Nubian Wild Ass E. a. africanus, as well as the domestic donkey, there is a stripe across the shoulder. The legs of the Somali Wild Ass E. a. somalicus are horizontally striped with black, resembling those of a zebra. On the nape of the neck there is a stiff, upright mane, the hairs of which are tipped with black. The ears are large with black margins. The tail terminates with a black brush. The hooves are slender, approximately the diameter of the legs.
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[edit] Behavior
The African Wild Ass is primarily active in the cooler hours between late afternoon and early morning, seeking shade and shelter amongst the rocky hills during the day. Swift and sure-footed in their rough, rocky habitat, the African wild ass has been clocked at 50 km/h (30 mph). Mature males defend large territories around 23 square kilometers in size, marking them with dung heaps - an essential marker in the flat, monotonous terrain. Due to the size of these ranges, the dominant male cannot exclude other males. Rather, intruders are tolerated - recognized and treated as subordinates, and kept as far away as possible from any of the resident females. In the presence of estrous females the males bray loudly. These animals live in loose herds of up to fifty individuals.
[edit] Diet
The diet of African Wild Asses consists of grasses, bark, and leaves. Despite being primarily adapted for living in an arid climate, African Wild Asses are dependent on water, and when not receiving the needed moisture from vegetation they must drink at least once every three days. However, they can survive on a surprisingly small amount of liquid, and have been reported to drink salty or brackish water.
[edit] References
- Equid Specialist Group (1996). Equus africanus. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 05 May 2006. Listed as Critically Endangered (CR A1b v2.3)
- Arkive: African Wild Ass
- Wild Equids
- U.S. Fish & Wildlife Service Species Profile
