The snake has been around for quite a while. Fossils have shown that snakes have been on earth for an estimated 80 million years. There are approximately 2000 species of snake on earth. Some snakes do have traces of hind limbs, or spurs. However, there is no snake that uses these for walking.
Snakes have no external ears, they hear by sensing vibration through a delicate bone structure.
Their tongue is used to pick up scents from the air, and bring them into their mouth. Classification Snakes fall into several families and subfamilies. Here at pet reptiles, we discuss in detail only those which are suitable as pets. These are small burrowing snakes, which are not commonly kept as pets. Superfamily Booidea are medium and large snakes.