african broad-mouthed collagen endangered flat-mouthed gray grazer grey heavy herbivore herbivorous hide horns keratin large lattice structured mammal megafauna odd-toed ungulate perissodactyl placid powerful rhino rhinoceros skin snout southern white rhinoceros square-lipped rhinoceros strong thick threatened tough wide-lipped rhinoceros broken carbon crystals diamonds gemstones rough bee hornet insect summer wasp wildlife black blue bush butterfly green orange swallowtail yellow damselfly dragonfly nature wings clouds field rain storm thunder thunderhead thunderstorm tornado keeping watch lookout meerkat sentinel suricate beach sun woman flutterby shrub sky tree Africa feline game lion lioness safari tawny wild