Perissodactyla (Odd-Toed Ungulates Including Horses, Rhinoceroses and Tapirs)
Published Online: 19 APR 2001
Copyright © 2001 John Wiley & Sons, Ltd. All rights reserved.
How to Cite
Prothero, D. R. 2001. Perissodactyla (Odd-Toed Ungulates Including Horses, Rhinoceroses and Tapirs). eLS. .
- Published Online: 19 APR 2001
The mammalian order Perissodactyla, or ‘odd-toed’ ungulates, includes the living horses, rhinoceroses and tapirs, and two extinct groups, the brontotheres and chalicotheres. Over their 55 million years, they evolved into an amazing variety of forms, and about 40 million years ago, they were the dominant hoofed mammals on the planet. Since then, they have been largely replaced by the even-toed artiodactyls, and today most wild perissodactyl species are on the brink of extinction.