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Boa constrictor

Lizards and Snakes Alive explores the world of squamates. Learn how chameleons and iguanas rely on vision while other lizards, such as geckos, depend on smell (using their tongues). See boas, mambas, cobras, geckos, skinks, and other squamates. Watch an anaconda slither and a chameleon catch prey with its tongue. Hear rattlesnakes and a barking gecko. (American Museum of Natural History, supported by Smithsonian Institution)

Interesting fact: Scientists recognize many groups of living squamates. Some groups include many species and some only a few; some names are familiar, some aren't. The cladogram includes snakes, because snakes are one kind of legless lizard, but scientists still don't know exactly where snakes belong in the tree. Are they closest to Gila Monsters and their relatives? Skinks and their relatives? Ideas differ. Read more.

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