The Hippo of Africa is a grand animal. This mammal spends most of its life in the water, up to 16 hours a day! The sun is hot in Africa, so this is how they stay cool. Hippopotamus have enormous mouths. An open hippo mouth can reach up to four feet wide! Their long canine teeth can grow up to a foot and a half long. If you didn’t already know, it’s best to stay far away from this mighty beast. That’s ok, because now you can color them.