aggressive alligator animal animals croc crocodile Crocodilia eco forest Gavialidae Gharial Incredible India India jaws jungle nature predator reptile retile sharp teeth vicious wild wild animal zoo African-dwarf-crocodile armoured-skin black-crocodile bony-crocodile broad-snouted broad-snouted-crocodile carnivore carnivorous cold-blooded dense-rainforest distinctive dwarf-crocodile habitat-loss nocturnal open-mouthed osteolaemus-tetraspis reptilian rough-backed-crocodile small solitary-animal vulnerable West-African