Palawan Monitor Lizard - rests on a path with its tongue outstretched (the tongue has a highly developed olfactory sense) to smell 'a visitor' (Varanus marmoratus). Puerto Princesa Subterranean River National Park - Sabang - Palawan - Philippines - February. A former subspecies of Varanus salvator now considered as a part of same-name complex of species but a separate species.