Snakes are living reptiles. They lack legs, voice, ears, and eyelids. They have a long, slender body. Their skin is covered with scales. They can see well enough, and they can taste scents with their tongues by flicking them in and out. They are very sensitive to vibrations in the ground.
Though they do not have a voice, they can hiss. Most live on the ground, others live in the water, and a few live under the soil. Like all reptiles, snakes need the heat of the sun to control their body temperature. That is why most snakes are in the warm, humid tropical regions of the world. A large portion are poisonous as well.
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