abstract age aged appearance armor armored armorment armour armoured armourment astrochelys-radiata carapace critically-endangered endangered giant tortoise herbivore hide large tortoise leathery longevity Madagascar old plod plodding protection protective radiated-tortoise reptile reptilian shell size skin slow strength strong texture textured textures tortoise zoo rough scaly tough animal big-cat breeding carnivore color colored colorful colors colour coloured colourful colours conservation contrast felid hunter mammal reclining rehabilitation relaxed relaxing resting striped sub-species swimmer tiger white white-tigers wildlife eating feeding giant-tortoise large-tortoise pattern patterned leaves meal african black-rhinoceros collagen creases Diceros bicornis folds food gray grazer grey heavy herbivorous herbivorous-browser hook-lipped-rhinoceros horns keratin large lattice-structured megafauna odd-toed-ungulate offspring perissodactyl placid powerful rhino rhinoceros snout southern-white-rhinoceros square-lipped rhinoceros surface thick threatened wrinkled wrinkles captive captivity cared-for carnivorous cat enclosure fauna lioness panthera-leo social space well-fed