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The monitor lizards are large lizards in the genus Varanus. They are native to Africa , Asia and Oceania , but are now found also in the Americas as an invasive species. A total of 79 species are currently recognized. Monitor lizards have long necks, powerful tails and claws, and well-developed limbs. The adult length of extant species ranges from 20 cm (7.9 in) in some species, to over 3 m (10 ft) in the case of the Komodo dragon , though the extinct varanid known as megalania (Varanus priscus) may have been capable of reaching lengths of more than 7 m (23 ft). Most monitor species are terrestrial, but arboreal and semiaquatic monitors are also known. While most monitor lizards are carnivorous, eating eggs , smaller reptiles, fish , birds and small mammals , some also eat fruit and vegetation , depending on where they live.