Varanus salvadorii is a species of monitor lizard endemic to New Guinea. Its common names include crocodile monitor, Papua monitor, Salvadori's monitor and artellia. It is the largest monitor lizard known from New Guinea, and is one of the longest lizards in the world, verified at up to 244 cm (8 ft). The tail of the species is exceptionally long, so that some specimens have been claimed to exceed the length of the world's largest lizard, the Komodo dragon; however, Varanus salvadorii is far less massive.

It is an arboreal lizard with a dark green body marked with bands of yellowish spots. It lives in mangrove swamps and coastal rainforests in the southeastern part of the island, feeding on birds, small mammals, eggs, and carrion. Its teeth are better adapted than those of most monitors for seizing fast-moving prey.

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