Hippopotamuses are heavy thick-skinned animals. A hippopotamus or hippo is a large animal with big tusks, a huge mouth, and small ears. The hippo gallops underwater and graze at night. Their predators are Lions and Crocodiles. They open their jaws wide to scare away crocs or call other hippos to fight. In the movie, the hippopotamus evolved a Shark fin, the claws of a Lion, and the two sharp fangs of a Viper. The hippos were canceled in the movie and replaced as a Crocodile.