Snake is a reptile because it has a special way of movement: one is meandering movement, and all snakes can crawl forward in this way. When crawling, the snake body makes horizontal wavy bends on the ground, so that the back of the bend exerts force on the rough ground, and the reaction force of the ground pushes the snake body forward. If the snake is placed on a smooth glass plate, it will be difficult to move. It is impossible to crawl in this way. Of course, there is no need to worry about snakes because there is no smooth ground like glass in nature.
The second type is crawler Movement, the snake has no sternum, its ribs can move forward and backward freely, and there are costodermal muscles connecting the ribs and abdominal scales. When the costal skin muscles contract, the ribs move forward, which drives the wide abdominal scales to stand up one after another, that is, they are slightly raised. The raised abdominal scales look like they are stepping on the ground, but at this time only the abdominal scales move and the snakes body Without moving, the costal skin muscles relax, and the posterior edge of the abdominal scales exerts force on the rough ground, pushing the snake body forward through reaction. The effect of this movement is to make the snake body crawl forward in a straight line, like a tank. . The third method is telescopic movement. The front part of the snakes body is lifted up and stretched forward as much as possible. When it comes into contact with a supported object, the snakes back part will retract forward, and then it will lift up the front part of the body and stretch forward to obtain the support object. , the rear part is retracted forward again, so that the snake can continuously crawl forward by stretching and contracting alternately. Snakes that crawl relatively slowly on the ground, such as lead-colored water snakes, will quickly and continuously expand and contract their bodies when disturbed, accelerating their crawling speed and giving people the feeling of jumping. In addition, snakes have hearing, but their hearing organs, that is, the ears, have a very simple structure. They only have inner ears and no outer ears and tympanic membrane structures, so their hearing is very slow.
