Huge male and female hippo walking upstream in muddy river on a hot summer day in the Serengeti, African Savanna, Kenya

hippos hippopotamus game reserve maasai mara game drive upstream wildlife big game species cooling down kenya huge animal big five africa animals serengeti herbivorous big animal amphibius protect animals upriver river endangered herd national park herbivore animal rights species muddy safari ecosystem mammal water group brown savanna huge big nature wild documentary bush underneath current undomesticated under summer sunny cinematic