african broad-mouthed close close-up cow creases endangered eye eye-lashes eye-lid flat-mouthed folds gray grazer grey heavy herbivore herbivorous hide large lattice-structured mammal megafauna mother odd-toed-ungulate perissodactyl placid powerful rhino rhinoceros skin southern-white-rhinoceros square-lipped rhinoceros strong thick threatened tough white rhinoceros wide-lipped rhinoceros wrinkled wrinkles