Some experts believe that the ancestors of snakes were certain kinds of burrowing lizards. There are many kinds of such lizards today, and all of them have very small legs or no legs at all. In time, the legs disappeared altogether. And despite this, snakes are able to move and get along very well indeed. One of the most helpful things for them in moving is the belly scales that cover the entire undersurface of most snakes.
There are four ways in which snakes move. One of them is called “lateral undulatory movement”. In this method. the snake forms its body into a number of wavy, S-shaped curves. By pressing backward and outward against rough places on the ground, the snake slips forward on those scales.
A second way snakes move is called “rectilinear movement”. In this case, small groups of the belly scales are pulled forward on a pan of the body, while other scales project backward to keep the snake from slipping back. Then the scales that have been holding the body are pulled forward. The that moved first to hold the body.
A third way is a “concertina” method, which is used for climbing. The snake wraps its tail and rear part of the body around a tree stretched out the forepart of its body and hooks it on the tree higher up. Then it releases the roaring part and pulls the rest of its body upwards. “Sidewinding” is another method by which snakes move.
A loop of the forebody is thrown to one side. Then the rear part is shifted to the new position, and another neck loop is thrown out. Snakes are reptiles, and all reptiles have skin that is dry and scaly. The snakes are thus related to the lizards, alligators and crocodiles, and turtles and tortoises.
Are Snakes Supposed To Have Legs?
Snakes used to have legs. Now they have evolved, but the gene to grow limbs still exists.