age aged armor armored armorment armour armoured armourment carapace elongated-neck giant-tortoise herbivore hide large-tortoise leathery longevity neck old plod plodding protection protective reptile reptilian shell size skin slow strength strong texture textured textures tortoise zoo aldabra giant tortoise aldabrachelys gigantea eating eating grass elongated neck giant tortoise large tortoise Seychelles abstract appearance aldabra-giant-tortoise aldabrachelys-gigantea eating-grass moist mouth open-mouthed tongue