Ungulates are further sub-divided into Perissodactyla and Artiodactyla, which means odd-toed and even-toed ungulates respectively. Contrary to their names, Artiodactyla and Perissodactyla are not ...

Traditionally ungulates were considered even or odd-toed hoofed animals, however, as genetics demonstrated new relationships between species, the number of animals who qualify as ungulates expanded.