1) Equid 2) Rhino 3) Rhinoceros 4) Tapir 1) Hoofed mammal 2) Odd-toed ungulate 3) Perissodactyl mammal 4) Ungulate 
• (n.) One of the Perissodactyla.
any member of the order Perissodactyla, a group of herbivorous mammals characterized by the possession of either one or three hoofed toes on each ... [5 related articles]
Per`is·so·dac'tyl noun (Zoology) One of the Perissodactyla. 
perissodactyl, perissodactylic, perissodactylous 1. Having an uneven number of toes or digits on each foot. 2. Any mammal of the order Perissodactyla, comprising the odd-toed hoofed quadrupeds and including the tapirs, rhinoceroses, and horses.