Hippopotamus

The hippopotamus (Hippopotamus amphibius), also known as the hippo, common hippopotamus or the river hippopotamus, is a large, herbivorous semiaquatic ungulate. It is one of the only two surviving species in the family, Hippopotamidae, the other being the pygmy hippo. Behind elephants and rhinoceroses, they are the third largest type of land animal and the biggest non-cetacean artiodactyl. They inhabit lakes, rivers, and mangrove swamps. Even though they look like pigs, there closest living relatives are cetaceans.