This is the order of the so-called “Odd-toed ungulates“. All members walk on either three toes (Rhinoceroses, Tapirs), or just one (Horses, Donkeys/Asses and Zebras). Also, the digestion of food happens in the intestines, rather than in a complex stomach, like the even-toed ungulates.

Sadly most of the species are also in danger of going extinct, some always had low numbers and small ranges (like the African wild ass), some suffer decline because of poaching and/or habitat loss. Another problem is interbreeding with domesticated relatives.