JOHN BEATTY / SCIENCE PHOTO LIBRARY JOHN BEATTY / SCIENCE PHOTO LIBRARY
Hippopotamuses. Adult hippopotamus (or hippo, Hippopotamus amphibius) with a calf, in water. A single hippo calf is born after a gestation period of around 230 days. Hippo calves nurse underwater and are frequently seen riding on their mother's back while she is in the water. These large herbivores live in and around rivers throughout southern and eastern Africa. They spend the majority of the day resting in water and grazing on water plants. At night, they may leave the water to eat fruits and sugarcane. The cattle egret (Bubulcus ibis) often perches on the backs of herbivores, which disturb its insect prey. Photographed in the Ngorongoro Crater, Tanzania.
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