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A legless reptile with a narrow body that may be as short as a finger or as long as a bus. Like other reptiles, snakes have backbones and scaly skins and are cold-blooded. Snakes need warm surroundings in order to be active. For this reason, snakes live mainly in warm areas of the world or in places that are warm for part of the year. Most snakes line on land, but some live in the oceans or in lakes and ponds.