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Frilled neck lizards inhabit Northern Australia. They have a frill folded up around their neck, and when they are startled, it spreads out and makes the lizard look twice as big as it normally is. Then the lizard makes hissing noises and shows its teeth. They're about 30 cm. (1 ft.), plus the tail. They eat insects and some small rodents.
Individual lizards' scales are different colors, depending on where they live. They reproduce by laying eggs.
Aside from Australia, monitors can be found in Africa, Asia, Indonesia, and New Guinea. Different species can grow to different sizes and weights. The short-tailed monitor is 20 cm. (8 in.) while the komodo dragon can get to be 3 m. (10 ft.) and weigh 135 kg. (300 lbs.).