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 reptile reptilian rough-backed-crocodile small solitary-animal vulnerable West-African zoo armor armored armorment armour armoured armourment Australian-freshwater-crocodile backstraps bony-ridges crocodylus-johnsoni danger dorsal-surface exotic fauna fresh-water-crocodile freshie hide Johnstone's-crocodile leather leathery lethargic omnivorous opportunistic opportunistic-predator osteoderms patterns powerful predator ridges rough rugged scales scutes semi-submerged skin tail tail-scutes territorial texture textured textures bony ridges crocodylus-porosus dangerous estuarine-crocodile hornback huge Indo-Pacific-crocodile large largest-reptile saltwater-crocodile basking crocodilian crocodylus-johnstoni Johnston's-crocodile reflection