close-up endangered eye face grass graze head horn kill mammal medicine mouth musketeers poach rhino rhinoceros blue clouds coast end estuary ripples ripples in water river mouth river. stream sea silhouettes water waves brachiosaur dino dinosaur extinct model monster natural nature neck nostril prehistoric reconstruction reptile tree usa aquarium caudal dorsal eyes fin fish gill Gills ocean pectoral spiny swim swimming african broad-mouthed collagen cow creases eating flat-mouthed folds food gray grazer grey heavy herbivore herbivorous hide horns junior keratin large lattice-structured megafauna mother odd-toed-ungulate offspring perissodactyl placid powerful skin snout southern-white-rhinoceros square-lipped rhinoceros strong thick threatened tough white rhinoceros wide-lipped rhinoceros wrinkled wrinkles calf youngster