Over the years, the San Diego Zoo Safari Park has been one of the best zoo locations for wild asses, and we’ve celebrated many “firsts” in the zoo world with them. Somali wild asses first came to San Diego from the Basel Zoo in Switzerland in 1981; in 1986, a foal was born, the first captive reproduction in the Western Hemisphere. Today, the Safari Park is one of only a few places in the United States that has Somali wild asses, and we have welcomed the births of 43 more foals, including 3 foals born in 2011. We currently hold more than any other zoo in North America.
A habitat featuring the rugged terrain and naturally occurring boulders at the Safari Park was opened for Somali wild asses in 2010. Watch for them during an Africa Tram Safari at the Safari Park.
All wild equids—horses, zebras, and wild asses—are threatened; however, the Somali wild ass is critically endangered. Political unrest, encroachment of their land and water sources by domestic herds, poaching, and a general lack of concern for their welfare are all major threats to the wild asses. The animals compete with people and livestock for food and water sources; they are hunted for food, skins, and use in traditional medicines; and they can also freely interbreed with domesticated donkeys, which further threatens the species.
The Somali wild ass is the smallest of all the equids and is at critical risk, with only a few hundred left in the wild. Something as simple as a drought could be enough to wipe out the species completely. Protected by the local government, Somali wild asses are still hunted for meat or for their fat, which is used medicinally and is believed to cure hepatitis. Another problem is hybridization; local people leave their female donkeys beside water holes at night, hoping Somali wild ass stallions will mate with the donkeys to improve the domestic breed. This is a serious threat to the gene pool of the wild species.
The Nubian wild ass may be extinct in the wild already, and there are none in zoos at this time.
San Diego Zoo Global participates in a Species Survival Plan for equids to help keep these species alive and well. Our San Diego Zoo Safari Park is one of only a few breeding facilities in the United States that maintains wild asses and has welcomed the births of numerous Somali wild asses, more than any other zoo in North America. We are working on a project to determine which factors impact reproductive success in this species.
We are also working on a project to document social behavior, activity budgets, nursing behavior, and behavioral development of foals and are working in collaboration with the St. Louis Zoo to examine hormone levels in relation to reproductive success.