河马是一种生活在非洲的两栖类兽,是野猪的亲属,也是地球上最大的非反刍偶蹄动物。河马一生中的大多数时间都泡在水中,只花费少数时间出来觅食。这是因为它们的体重实在太巨大,不得不依靠水浮力的帮助才能支撑。河马渗出的这种像血一样的液体实际上是河马皮肤所分泌出的一种 Hippopotamus is an amphibian animal living in Africa, a relative of wild boar and the largest non-ruminant cloven-hoofed animal on the planet. Most of the hippo’s life is soaked in water that it takes only a small amount of time to feed. This is because their weight is so great that they have to rely on the help of water buoyancy to support them. The blood-like liquid leaking from a hippopotamus is actually a kind secreted by the hippopotamus skin