【希望之声2020年9月26日】Hippos can be found in both savannah and forest areas. Proper habitat requires enough water to submerge in and grass nearby. Larger densities of the animals inhabit quiet waters with mostly firm, smooth sloping beaches. Males may be found in very small numbers in rapid waters in rocky gorges. With the exception of eating, most of hippopotamuses' lives – from fighting with other hippos, mating, to parturition – occurs in the water. Hippos leave the water at dusk and travel inland, sometimes up to 10 km, to graze on short grasses, their main source of food.