Group of hippos in big pond splashing murky water on themselves

serengeti national park pond tanzania river hippopotamus environment african savanna africa national park hippopotamuses conservation grasslands hippopotamidae african wildlife hippos water river horse savanna subsaharan africa hippopotamus wide shot acacia ripples overcast calm bush large reserve outdoors safari dry african endless plain muddy splashing cloudy group savannah giant murky mammal semiaquatic big round handheld herbivore bloat nobody vulnerable strength