Perissodactyla

† Megacerops & allies	An odd-toed ungulate is a mammal with hooves that feature an odd number of toes. The middle toe on each hoof is usually larger than its neighbours. Odd-toed ungulates are relatively large grazers and, unlike the ruminant even-toed ungulates (artiodactyls), they have relatively simple stomachs because they are hindgut fermenters, digesting plant cellulose in their intestines rather than in one or more stomachs. Odd-toed ungulates include the horse, tapirs, and rhinoceroses. Although no unequivocal fossils are known prior to the early Eocene, the odd-toed ungulates probably arose in what is now Asia, during the Paleocene-Eocene boundary (55 million years ago). For more information, visit the Wikipedia entry. Get back to Eutheria
† Chalicotheres
Equidae
Tapirs
Rhinoceroses