A large, amphibious, herbivorous mammal (Hippopotamus
   amphibius), common in the rivers of Africa. It is allied to the hogs,
   and has a very thick, naked skin, a thick and square head, a very large
   muzzle, small eyes and ears, thick and heavy body, and short legs. It
   is supposed to be the behemoth of the Bible. Called also zeekoe, and
   river horse. A smaller species (H. Liberiencis) inhabits Western
   Africa.