The hippopotamus, or hippo, is a large, mostly herbivorous mammal in sub-Saharan Africa, and one of only two extant species in the family Hippopotamidae. The name comes from the ancient Greek for "river horse"
15 Laziest Animals -- HIPPO Sleeps For: hours a day Snooze Stats: Hippos that stay together sleep together. They tend to take naps in groups of up to Although they can sleep on land, hippos are also able to sleep underwater. During their underwa