Rock Monitors (Varanus albigularis), also called Tree Leguaans in southern Africa, are Africa’s heaviest-bodied lizard. Adult males average about 6 to 8 kilograms (13 to 18 pounds), and large mature males may reach 17 kilograms (37 pounds). Rock Monitors are generalist predators, mainly eating invertebrates such as millipedes, snails, beetles, grasshoppers and crickets. Like other monitor lizards, Rock Monitors pick up the scents of food items by flicking their long forked tongues, which are then inserted into the vomeronasal organ (or Jacobson's organ) in the roof of the mouth. They tend to be too slow to catch most vertebrates, but are known to eat small tortoises, that they swallow whole. They also scavenge carrion, and in this case scraps of bread and cooked egg that were found using the lizard’s acute sense of smell. This Rock Monitor was foraging around the base of a Lala Palm in the Shingwedzi Rest Camp in Kruger National Park.