a hippopotamus submerged in water, with only its eyes, ears, and nostrils visible above the surface.

39aph39 african amphibius animal behavior biodiversity brown calm common conservation dangerous dappled dark ears endangered environmental eyes fat glistens grazing herbivore hippo hippopotamus huge lake large mammal moist moisture mud nature nostrils planteating pond preserve protection reflection relaxed river savanna skin sleepy submerged sunlight surface swamp threatened visible vulnerable water wet wetland wildlife