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The open mouth of a hippopotamus, illuminated by the glow of sunset. The hippo (hippopotamus amphibius) is a large, mostly plant-eating African mammal. The hippopotamus is semi-aquatic, inhabiting rivers and lakes in sub-Saharan Africa in groups (or rafts) of 5-30 hippos. During the day they remain cool by staying in water or mud.They emerge at dusk to graze on grass.