MARK NEWMAN / SCIENCE PHOTO LIBRARY MARK NEWMAN / SCIENCE PHOTO LIBRARY
Hippopotamus mouth. The hippopotamus (Hippopotamus amphibius) is a large and heavy African herbivore. It can reach a length of over 3 metres, and can weigh over 3 tonnes. It has sharp canines that are used to attack mating rivals and defend itself. It can open its mouth to an angle of 150 degrees, compared to 45 degrees in humans. It feeds on vegetation in rivers and lakes in sub-Saharan Africa, emerging at night to feed on grasses. The hippopotamus communicates with a variety of grunts and rumbling noises.
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