Yawning Hippopotamus (Hippopotamus Amphibius) At Serengeti National Park, Tanzania

serengeti national park unesco world heritage site united republic of tanzania africa day hippo hippopotamus nobody open mouth outdoors tanzania vertical water wildlife yawning hippopotamus amphibius african serengeti unesco unesco world heritage sites wildlife refuge wildlife refuges world heritage site world heritage sites national park national parks yawn gape gaping open mouth mouths teeth tooth shore shoreline muddy muddy water animal animals outdoor outside wild wild animal wild animals wild animal wild animals wild life