They do not have legs and they slither along the ground. In the United States, only copperheads, coral snakes, rattlesnakes, and water moccasins have poisonous bites. Harder - Snakes have a long, legless, flexible body that is covered with dry scales. When snakes move about on land, they usually slide on their belly. They repeatedly flick out their narrow, forked tongue, using it to bring odors to a special sense organ in the mouth.
Snakes belong to the order of animals called reptiles.
This group also include crocodiles, lizards, and turtles. As with the other reptiles, snakes maintain a fairly steady body temperature by their behavior. They raise their temperature by lying in the sun or lower it by crawling into the shade. There are about 2,400 species of snakes in the world. They live almost everywhere, in deserts, forests, oceans, streams, and lakes.