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Instead of growing upwards, the hippo's lower incisors protrudes parallel to the front, like shovels. When a hippopotamus sleeps on the surface of the water, its broad back rises completely out of the water like an upturned boat bobbing with the waves. A hippopotamus could chew reed stalks five or six centimeters thick as easily as a man could eat leeks! When there is danger around them and they cannot expose themselves, the hippopotamus keeps only the tip of its head slightly above the water and watches silently like a submarine.