hippos in the river walking towards mud pit

africa aggression aggressive agitated amphibius animals aquatic artiodactyla botswana choebe dangerous deadly fighting hippo hippopotamidae hippopotamus hippopotamuses hippos huge jaws leathal males mammal mammalia mammals mammifauml res mamashy fero masseter mikael mud nature pit pod poisonous powerful reptiles resting river semiaquatic snake south summer teeth the threatening towards walking wildlife yawning