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Snakes, lizards, crocodiles, and turtles are the coolest cold-blooded animals on the planet. See a ten-inch reptile that has a two-foot long tongue, and snakes that can swallow prey up to twice the size of the diameter of their mouths. Learn why snakes shed their skin and what causes a chameleon to change its colors. Meet the Mellers giant chameleon and a salt-water crocodile that is 23 feet long and weighs over a ton. Learn which reptiles make good pets and which are not meant to be domesticated.