The rhinoceros (plural rhinoceros, rhinoceroses, or rhinoceri) or rhino is any of the odd-toed ungulates (order "Perissodactyla") comprising the biological family "Rhinocerotidae".

There are five surviving species, two of which are native to Africa and three to southern Asia. These mammals are all large, thick-skinned herbivores and have either one or two horns (actually thickly matted hair) on the upper snout.

In the odd-toed ungulates the central axis of the foot passes through the third toe. In rhinoceroses, the first and fifth toes are lost and the animal walks on the remaining three toes. Their footprints are shaped like the ace of clubs.

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