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Alien Black-eyed Monkey Tree Frog (Phylomedusa gamba) Puerto Maldonado Rainforest Conservation Anuran, Peru - photo: Paul Bratescu on 500px

Blue-tongued lizards, or skinks, have vivid cobalt-colored tongues. Native only to Australia, they're docile creatures that are often kept as pets. They're also the world's largest urban-dwelling wild lizards, and can grow as long as two feet!

The perentie (or perente) (Varanus giganteus) is the largest monitor lizard or goanna native to Australia, and fourth-largest living lizard on earth, after the Komodo dragon, the crocodile monitor, and the water monitor. Found west of the Great Dividing Range in the arid areas of Australia, they are not a common sight because of their shyness and the remoteness of much of their range from human habitation.