The Hippopotamus, also known as the HIPPO, is a large mammal native to Africa. It is the third-largest land mammal after the elephant and rhinoceros. The term 'BEHEMOTH' is derived from the Hebrew Bible and is used to describe a large, powerful creature. The Riverhorse is another name for the Hippopotamus, as it is often found near rivers and lakes. All three terms refer to the same animal, the Hippopotamus.