The center of a hippo's day life is water . Like a hippo pool-party, sometimes hundreds of hippos, will share a territory of water during the day. Whether it's mating, playing, fighting or giving birth, hippo's all wet . The hippo's night life begins a few hours after sunset, when all the hippos file out of the water to graze on land by the light of the moon. So many hippos may use the same path out of the water at dusk that it will become worn five or six feet deep.
Hippos have huge mouths and teeth, even though they eat grass.