Africa Aggression Animal Animal behavior Animal body part Animal head Animal mouth Animal teeth Animal themes Animals in the wild Aquatic mammal Close up Color image Day East africa Famous place Fighting Herbivorous Hippopotamus Hippopotamus amphibius Hippopotamus calf Horizontal Male animal Mammal Mouth open Named wilderness area National park Natural landmark Natural parkland Nature reserve No people Outdoors Photography Safari animals Savannah Selective focus Serengeti national park Strength Tanzania Travel destinations Two animals Unesco world heritage site Vertebrate Wildlife Wildlife conservation Wildlife reserve Young animal