abstract age aged appearance armor armored armorment armour armoured armourment astrochelys-radiata carapace critically-endangered eating endangered feeding giant-tortoise herbivore hide large-tortoise leathery longevity Madagascar old pattern patterned plod plodding protection protective radiated-tortoise reptile reptilian rough scaly shell size skin slow strength strong texture textured textures tortoise tough zoo leaves meal Australia Australian Australian-sleepy-lizard blue-tongue blue-tongued-goanna blue-tongued-skink bobtail bobtail-goanna bogeyes crawling creature eyes fauna goanna heavily-armored-body lizard mottled omnivore open-mouthed scaly-skin shingleback short-tailed Skink slow-moving stump-tailed-skink stumpy-tail tiliqua-rugosa tongue tough-hide viviparous-skink wildlife close ground ground-level head lapping aldabra-giant-tortoise aldabrachelys-gigantea brown colors colours contours cover exterior grooves hard horny-plates layers lined lines outlines pointed points shelter solid banded bands blue-tongued-lizard blueys body-flattening dark-streaked distinctive diurnal ground-foraging large-headed omnivorous reptilia sedentary skink-species striped stripes sturdy terrestrial tiliqua-multifasciata Australian-freshwater-crocodile backstraps bony-ridges crocodile crocodylus-johnsoni danger dorsal-surface exotic fresh-water-crocodile freshie Johnstone's-crocodile leather lethargic opportunistic opportunistic-predator osteoderms patterns powerful predator ridges rugged scales scutes semi-submerged tail tail-scutes territorial Camouflage light mixed-light patchy shade shadows sunlight sunshine