Perissodactyla (Odd-toed Ungulates)

Members of the order Perissodactyla, also known as odd-toed ungulates, are mammals characterized by an odd number of toes and by hindgut fermentationwith somewhat simple stomachs. Perissodactyla comes from the Ancient Greek περισσός (perissós, “uneven”) + δάκτυλος (dáktulos, “a finger, toe”). Unlike the even-toed ungulates, they digest plant cellulose in their intestines rather than in one or more stomach chambers. The order includes three extant families: Equidae(horses, asses, and zebras), Rhinocerotidae (rhinoceroses), and Tapiridae (tapirs), with a total of about 17 species. Despite their very different appearances, they were recognized as related families in the 19th century by the zoologist Richard Owen, who also coined the order name.
== Families ==
* Rhinocerotidae