| Hippopotamus amphibius This 3,600-kilogram (7,937 pound) mammal, a relative of the pig, is well adapted to aquatic life and spends its days lounging in rivers and lakes. Native to Africa south of the Sahara, a hippo weighs 27 kilograms (60 pounds) at birth and can run and swim within five minutes. Its eyes, ears, and nostrils are set high atop its head so they remain above water when the hippo submerges. Its characteristic yawn is actually an aggressive gesture, and a competing male will slash another with its tusklike teeth. |
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