High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! The odd-toed ungulates are browsing and grazing mammals such as horses, tapirs and rhinoceroses whose hooves each feature an odd number of toes. The middle toe on each hoof is also usually larger than its neighbors. Together, odd-toed ungulates form the order Perissodactyla. They are relatively large and, unlike the ruminant even-toed ungulates (artiodactyls), they have relatively simple stomachs. This is because they are hindgut fermenters, digesting plant cellulose in their intestines rather than in one or more stomachs.