Hippopotamus or hippo are the third largest land animal after the elephants and rhinoceros. They are also semiaquatic mammals. They can hold their breaths in water for more than 5 minutes. Hippopotamus in ancient Greek literally means 'horse of the river'. They are also the deadliest land animal in Africa. There are only two species of hippopotamus- the Modern Hippopotamus and the Pygmy Hippopotamus. Their relatives are whales, dolphins, porpoises and other cetaceans. To protect them from the intense heat they spend most of their time in the water. They also produce a type of liquid which acts like sunscreen.
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