A Hippo

          A hippo can open its mouth wide enough to fit a 4 foot tall child inside. Also, contrary to popular belief, hippos are ill-tempered and aggressive toward humans.

          Hippos have mouths that can open 150 degrees wide to be four feet high, revealing teeth that are 20 inches tall!

          Hippos are very aggressive. Male hippos use their big teeth for fighting and when threatened they snort, roar, lunge and chase enemies. Female hippos are also highly protective of their young, and act very aggressively to intruders. If a hippo feels threatened by a person, the hippo can kill a person.