The rock monitor (Varanus albigularis) is a species of monitor lizard in the family Varanidae. The species is endemic to Central, East, and southern Africa. It is the second-longest lizard found on the continent, and the heaviest-bodied; locally, it is called leguaan or likkewaan.
Varanus albigularis is the heaviest-bodied lizard in Africa, as adult males average about 6 to 8 kg (13 to 18 lb) and females weigh from 3.2 to 5 kg (7.1 to 11.0 lb). Large mature males can attain 15 to 17 kg (33 to 37 lb). It is the second longest African lizard after the Nile monitor (Varanus niloticus). Varanus albigularis reaches 2 meters (6 ft 7 in) in total length (including tail), with its tail and body being of equal size. Mature specimens more typically will measure 0.85 to 1.5 meters (2 ft 9 in to 4 ft 11 in). The head and neck are the same length, and are distinct from each other. The bulbous, convex snout gives an angular, box-like appearance. The forked tongue is pink or bluish, and the body scales are usually a mottled gray-brown with yellowish or white markings.