snakes are a kind of reptile with no legs. they move by sliding along the ground, or along the branches of trees. Snakes are cold-blooded, so they have to keep their body warm to stay active. Often they bask in the sun to by sliding under a stone. These scaly animals have such a bendy, or flexible, body that they can curl themselves up into a ball. Many snakes are poisonous, while others are big and strong enough to suffocate their prey or enemies.