Can you say "H" for Hippopotamus. The Hippopotamus name means "river horse". It is a plant-eating water-loving giant. A relative of camels, pigs, and deer, the hippo has two lives in one. 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. Did you know they can talk?. Hippopotamus make a of variety grunts, growls, screams and other sounds underwater to communicate with each other. Imagine that!