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Monitors live in Africa, Asia, Austrailla, and the Pacific Islands. They can be very small, 8 inches [20cm]. Monitors have quite thick skin and tails used for whipping. Their tongues fly out of their mouthes so they can taste the air for air for chemical signals. Those signals tell them where there is food, possible female monitor "mate", or predators. A related lizard to the monitor is the Lacterid. The crocodile monitor is very active at night and spends most of it's time in water.