Why do snakes crawl without legs and feet?

One is the meandering movement, in which all snakes are able to crawl forward. When crawling, the snake body makes a horizontal wavy bend 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, then it will be difficult to move an inch, and it will not be able to crawl in this way, of course, there is no need to worry about the snake, because in nature there will be no smooth ground like glass.

The second is the crawler movement, the snake does not have a sternum, its ribs can move freely back and forth, and there are costal skin muscles between the ribs and the abdominal scales. When the costal muscles contract, the ribs move forward, which drives the wide abdominal scales to erect in turn, that is, slightly warped, the upturned abdominal scales are like stepping on the ground, but at this time only the abdominal scales move and the snake body does not move, and then the costal skin muscles relax, the posterior edge of the abdominal scales exert force on the rough ground, and push the snake body forward by reaction, and the effect of this movement is to make the snake body crawl forward in a straight line, just like a tank.

The third way is the telescopic movement, the front of the snake body is raised, stretch forward as much as possible, when it touches the supported object, the back of the snake will follow the retraction forward, and then lift the front of the body to stretch forward to get the support, and the back part will retract forward, so that the snake can continue to crawl forward. Snakes that crawl slowly on the ground, such as lead-colored water snakes, will quickly expand and contract continuously when alarmed, speeding up the crawling speed and giving people the feeling of jumping.

When the muscles contract, the scales are slightly raised, and the raised scales are pressed against the ground like feet, which propels the body forward to crawl. Hope it helps!

He squirms, and the peristaltic energy makes it crawl.

Because it's a reptile.

Hehe, his abs are better.

The most common way for snakes to move is to use their bodies to snake and move forward in an S-shaped manner. Snakes use their abdomen to rub against the ground. If you observe the snake under the glass, you can see the scales of its abdomen moving and gliding.

Their spine has nearly 500 vertebrae, making them one of the most flexible creatures in the world.

For example, the sandy areas of Namibia in southwestern Africa are very hot next to the slag, but the flanking rattlesnakes here can adapt. Lift your head up with the front half of your body off the ground, then start walking diagonally on one side, repeating the movement using your upper back.

Why do snakes walk without feet?

To be precise, the snake is not walking, but crawling.

Although it has no legs, the snake has many scales on its body, which are large and strong, and the snake crawls on the scales on its body, and these scales can stand up or fall down again, as if walking on countless tiny feet, stepping on the ground and pushing the body forward. The special body structure also helps it crawl quickly.

There are two kinds of snake scales, one grows on the ventral surface**, which is called ventral scales. The other is on both sides of the ventral scales to the back, called body scales. The abdominal scales are connected to the ribs by the rib skin muscles, and the ribs of snakes are different from those of humans, and the spine of snakes is extremely long, usually composed of more than 300 vertebrae, some as many as 400.

At each end of each vertebrae, in addition to the anterior and posterior joints as in all vertebrates, snakes also have a pair of paraarthrites. The lonely anterior end of the vertebrae is called the vertebral arch bulge, which is a wedge-shaped protrusion; The posterior end is called the vertebral arch fovea and is concave. In this way, the accessory joints between the two vertebrae at the front and back are convex and concave, and they are mated to each other.

As a result, each vertebra of a snake has special double joints. Therefore, the whole vertebrae of the snake not only do not have the worry of dislocation, but can also increase its curvature and flexibility. When crawling forward, the body can do left and right S"-shaped bending movements.

In addition to the spine, which has double joints and can do S"-shaped movements, each of its vertebrae, except for the first ring vertebra in front and a few vertebrae at the tail end, has a pair of slender and curved ribs. It can move freely. When the costal muscles contract, the ribs move forward, causing the scales to lift slightly so that it can propel the body forward with the help of the ground or something.

In addition, the snake's vertebrae are firmly connected, so that the snake's body has a stronger ability to bend left and right, so that the snake can perform wavy movements, and the side of the body can be used to exert pressure on the ground to help the snake move forward quickly.

Turtles, crocodiles, lizards, and snakes are all reptiles, but except for snakes, they all have legs and feet, so how can snakes crawl without legs? It turns out that the ancestors of snakes also had legs and feet, but due to long-term evolution, the legs and feet have degenerated, and snakes are relatively successful in the process of evolution. It "glides" on the scales of its abdomen, making it more agile and faster than its legs and feet.

Snakes have a very long segmented backbone. Each spine has a rib on each side, and this spine and these ribs can move freely. Each pair of ribs has muscles connected to the scales, and when the muscles stretch and contract, the ribs move the scales to move, erect the scales, and then fall down, and the body takes a step forward, just like walking on countless small feet, driving the body to crawl forward.

Sometimes we see the snake moving forward in a zigzag, which is because it uses the stones and other objects on the left and right to make the body form several arch-shaped curves, backwards and outwards against the ground, and slides forward with scales. Sometimes it can also fold its body, reach forward with its head in front of it and grab the ground to move forward, then release the back of its body and pull it forward.

The snake's eyesight is very poor and its ears are not very good, so the developed and sensitive tongue plays an important role in guiding it to crawl, and the snake constantly spits out its forked tongue as it crawls to sense its surroundings.

Snakes have a lot of scales on their bodies, which are the outermost layer of armor on their bodies. The scales are used not only to protect the body, but also to make their feet. When the snake crawls forward, its body will be in an S shape.

And each scale, on the outside of the S-shape, will be warped to help the snake grasp the uneven road surface as it advances. These scales work with the snake's muscles to propel the snake's body forward, so the snake can walk without legs!

The snake's ability to crawl is related to the unique coat and skeletal structure it wears. The whole body of the snake is covered with scales, but these scales are different from fish scales, which are made by the outermost layer of cuticle, so they are called scales. And most fish, their scales are made from the innermost layer of the dermis.

The scales of snakes are tough, impermeable, and cannot grow correspondingly with the growth of the body, and snakes need to molt once when they grow up. After molting, the newly grown scales are larger than the original. Snake scales not only prevent water evaporation and mechanical damage, but are also the main structure for snakes to crawl without feet.

There are two kinds of scales on the snake's body: one is on the ventral surface**, which is larger and rectangular in shape, called ventral scales; The other is on the sides of the ventral scales and even to the back, and is small in shape, called body scales. The ventral scales are connected to the ribs by the costal cutaneous muscles.

The snake does not have a sternum, and its ribs move freely from front to back. When the costal muscles contract, the ribs move forward and the scales are slightly raised. The tip of the upturned scales steps on the ground or other object like a foot, propelling the body forward.

In addition, in addition to the general articular process, there is a pair of vertebral processes at the front end, which forms a joint with the vertebral ax concave at the back end of the previous vertebrae, which not only makes the vertebrae of the snake more firmly connected to each other, but also makes the snake have the ability to bend the body left and right, so that the snake body can carry out wavy movement. In this way, the side of the body constantly exerts pressure on the ground, pushing the snake body forward. This movement, combined with the movement of the ventral scales, allows the snake to crawl forward very quickly.

How do a snake crawl fast without feet? Here's why.

The snake has a long segmented spine in its body, and there is a pair of ribs on both sides of each backbone, just like the main heart bone in the fish's body, the difference is that the snake's spine and ribs can move freely, and the surface of the snake's body is covered with scales, and each pair of ribs connects the muscles, and the muscles are connected to the scales, when the snake wants to move forward, the ribs pull the muscles, and the muscles will pull the scales to stand up and fall, using the friction force underneath to slide forward, just like the body is covered with countless little feet.

So why does the snake bend forward? This is mainly because the snake touched the obstacle, the scales were erected, and then rubbed and slipped outward, and then changed direction, and the speed of the snake sliding can be described as quite fast, which is probably the real reason for painting the snake, I don't know if there is a solution to the doubts in the hearts of the friends?

How do a snake crawl fast without feet? Here's why.

Why do snakes walk without feet?