A hippo sitting next to a small pod of hippos resting, opens his mouth with water dripping out

hippo hippopotamus resting water afternoon crash glow reflection africa south african watering hole aggressive aggression sunlight dangerous group many semiaquatic ungulates beautiful ivory hippopotamidae savannah freshwater estuarine herbivore mutualism birds animal river wildlife south africa big safari large teeth reserve lake nature tough threatening displaying threat unpredictable sleeping relaxed sunny together