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 African-dwarf-crocodile animal armoured-skin black-crocodile bony-crocodile broad-snouted broad-snouted-crocodile carnivore carnivorous cold-blooded crocodile Crocodilia dense-rainforest distinctive dwarf-crocodile habitat-loss nocturnal open-mouthed osteolaemus-tetraspis rough-backed-crocodile small solitary-animal vulnerable West-African abstract appearance astrochelys-radiata critically-endangered endangered giant tortoise large tortoise Madagascar radiated-tortoise aldabra giant tortoise aldabrachelys gigantea eating eating grass elongated neck Seychelles