The hippopotamus is a large amphibious, herbivorous mammal.  It is characterized by large canines, a long body, and a long snout.  After the elephant and rhinoceros, the hippo is the third largest land mammal and is the heaviest Artiodactyl (even-toed Ungulate).  While hippos may look a lot like rhinos, they are closely related to the whales, dolphins, porpoises, dugongs, and manatees.  The main hippo were , , and Desmostylas.  The first hippo relative was probably .  It was then followed by, Hippopotamus gorgops, Kenyapotamus,cyprus pygmy hippo ,hexaprodoton sivalensis and Archaeopotamus..... hippos very big

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