Snakes are reptiles, do they have legs?

Snakes have no feet. Physiologic characteristics of snakes: slender body, no limbs, and no forelimb belts.

The smallest is 100 mm long, and the largest is more than 10 meters long like the South American anaconda. Lower species tend to have hind limb bands, and a few have remnants of hind limbs outside the body. There are no ear holes, and there is no tympanic membrane, tympanic cavity, and eustachian tube.

Except for some cavemen, where the eyes are hidden under the scales, the eyes are covered with a transparent film formed by the healing of the upper and lower eyelids.

The tongue is elongated, bifurcated, and can be retracted. The neck is generally not noticeable. The trunk and tail are separated by a transversely cleft cloacal foramen.

The characteristics of body anatomy are mainly related to the thinning and elongation of the body shape and the devouring of large foods. The lengthening of the body is not due to the lengthening of the vertebrae, but to the increase in the number of vertebrae, as many as 141,435, with one pair of long ribs in each dorsal vertebra from the third dorsal vertebra onwards, in addition to the first two dorsal vertebrae.

Internal organs grow, and paired organs tend to be arranged anteriorly and backward or degenerate on one side. Barb-like teeth have the effect of grasping food when swallowing. The maxilla, palatine, and pterygoid bones are loosely attached to the skull and can move alternately to move food into the mouth; The left and right halves of the mandible are connected by ligaments, and are connected to the thoracic skull by means of a square bone, so the mouth can be opened very wide, and the jaw is relaxed.

Without the sternum, the rhythmic contraction of the abdominal muscles allows the whole large food of the swallowed pharynx to move into the stomach. There is a pair of cohesive devices on both sides of the base of the tail of the male snake, which is turned out from the inside to the outside through both sides of the cloacal foramen during mating, and only one of them is used for each mating. Oviparous or ovoviviparous.

Extended Materials. Two hypotheses about the degeneration of the snake's limbs:

1. At the molecular biology level, it has been verified that snakes and lizards are closely related, plus some"Bipedal snakes"of fossils and morphological evidence (e.g., pythons with incomplete degeneration of hind limbs, degeneration of limbs of snake lizards), one hypothesis is that snakes evolved from burrowing lizards. Degenerative limbs made ancient snakes more accustomed to burrowing life and specific predatory behaviors.

2. Another hypothesis is that snakes evolved from ancient aquatic reptiles, and it is obvious that they are more suitable for aquatic life without limbs.

Reptiles without feet include the snake lizard, which is as legless as a snake despite its lizard appearance; Amphibians without legs include frog tadpoles, and the young tadpoles that hatch from their eggs are legless and slowly grow legs later.

Snakes have no legs, they rely on the interplay of bones, muscles, and scales, as well as the twisting and twisting of their bodies. When the snake tries to crawl forward, the movement of its ribs pulls the muscles, which in turn cause the scales under the belly to stand up and then fall down, and the repetition of this action combined with the twisting of the body allows the snake to rely on the friction of the ground.

Glide forward and look like you have a lot of little feet on your belly.

The skeleton of snakes snakes are relatively unique animals in nature, many times they will leave a shadow on humans, and the body structure of snakes is relatively special, although they have no legs, but sometimes they run very fast. In fact, the whole body of the snake can be regarded as a locomotor organ, its body is relatively flexible and very long, mammal.

There are only 16 vertebrae, but the snake's vertebrae have reached hundreds, and the snake's vertebrae can also move up and down, left and right, bend, and the ribs can also move freely back and forth, which creates favorable conditions for the snake to slide with its body.

The crawling speed of snakes will also have different speeds for different snakes. Most snakes do not crawl very fast, about the same as when a person walks, about 4 kilometers an hour; Some small snakes with slender bodies are faster, and flower snakes fly on the grass as the folk say.

Speeds may reach 10 to a dozen kilometers per hour; The fastest crawling in the world should be the black mamba snake in Africa.

It can reach a speed of 15 to 24 kilometers per hour, which is more than the speed of ordinary running, of course, the black mamba cannot maintain this high speed for a long time, and can only be achieved in the case of sprinting.

There are several ways to crawl snakes, which basically rely on the friction of stomach muscles and scales against the ground, plus different ways of twisting the body. One of them is telescopic locomotion, that is, like a caterpillar.

Or earthworms. In the same way, the body is retracted first, and then stretched forward to achieve the purpose of forward, this way of crawling is not fast; The second is meandering, which is a more common and faster way for snakes to crawl, but it is not easy to use on smooth roads; The third species is the rattlesnake in the desert.

This crawl is suitable for gliding on floating deserts; There is also a straight crawl of snakes, which is a little slower but quiet, and is mostly used when hunting.

Snakes don't have legs, but they can still run wild. In fact, the snake's entire body is a locomotor organ, and it can use its bones and scales to move forward.

Snakes walk on land by bending in the shape of the left and right sides of their bodies and by moving with the help of scales on their abdomen. The snake's vertebrae have a special structure, each vertebrae have a pair of ribs, all of which can be moved by the contraction of the muscles, and the subcutaneous muscles under the ribs are connected to the abdominal scales, allowing the snake to move.

The snake body is elongated, divided into three parts: head, trunk and tail, and there are no limbs or claw-like hind limbs on both sides of the cloaca of lower snakes. Snakes are a group of animals belonging to the phylum Chordates, the class of Reptiles. Covered in scales; The head is of various shapes, with nostrils located on the snout, but the lifelong marine species of the sea snake family (hydrophidae) lives on the back of the snout; Protective transparency** outside the eyeball, round, vertically oval or horizontally oval, no active eyelids, and a nearly spherical lens.

tongue elongated and bifurcated; The premaxilla (only python snakes have teeth with teeth), maxilla, palatine, pterygoid and tooth bones with posterior curved tooth apex, but the size, number and structure of the teeth vary from snake species to species. The tail is significantly shorter than the head body length.

The diurnal nature of snakes

Circadian refers to the daily activity of snakes, which is related to foraging and environment, temperature, and light. In general, king cobras, cobras, etc., mainly forage during the day and rest at night, which is called diurnal sexual activity. The main activities of the silver krait and the krait snake are out at night to forage for food, which is called nocturnal sexual activity.

Pit vipers, on the other hand, mostly go out in the morning and dusk to forage for food, which is called morning and dusk sexual activity. In general, the pattern of diurnal activity depends largely on the activity time of the animal preyed on by snakes.

In addition, the activity of the snake is also related to the external humidity. For example, sharp-nosed pit vipers, soldering iron heads, bamboo leaf greens, etc., are frequently active and extremely active when the humidity is high on rainy days. Cobras and other species tend to go out on sunny days when the humidity is low.

Snakes are usually active when it is about to rain or be cloudy for a long time, the weather is hot and humid, and the humidity is high. Snakes, whether they go out during the day or at night, mostly do it for food, and after they have a full meal, they will sleep in their habitat for a few days, and then go out again to forage for food when the food in their stomachs is exhausted.

Snakes have reptile characteristics, such as scales or nails on the body surface, which can prevent the evaporation of water in the body and are conducive to adaptation to life on land; Breathing with lungs, body temperature is not constant, etc

Therefore, the answer is: snakes have the characteristics of reptiles, such as scales or nails on the body surface, which can prevent the evaporation of water in the body and are conducive to adapting to life on land; Breathing with lungs, body temperature is not constant, etc

The reason why the snake has no limbs and belongs to reptiles is because it has the characteristics of reptiles, such as large reptiles have scales on the body surface, which can prevent the evaporation of water in the body, and are more adapted to life on land, and most reptiles use their lungs to breathe, and their body temperature will also change according to changes in the outside world.

The reason why snakes belong to reptiles.

Snake is very different among many animals, it belongs to cold-blooded animals, and most of them are poisonous, so many people see it is a daunting attitude, but people are very puzzled that snakes have no limbs and only rely on their bodies to slide on the ground, but they are classified as reptiles.

The reason why the snake does not have limbs is indeed a reptile is because it has most of the characteristics of a reptile, one of which is that the body surface has scales, which is mainly to prevent the evaporation of water in the body, so as to be more adaptable to life on land, and snakes, like most reptiles, mainly use their lungs to breathe.

In addition, the body temperature of snakes is unstable, which is also in line with the characteristics of reptiles, their body temperature will mostly change according to the morning temperature of the outside world, so as to be more adaptable to the environment, and when it is particularly cold in winter, they will also hibernate to reduce activity intake and maintain body functions.

Snakes are reptiles that belong to the phylum Chordates and the class of reptiles. The body is elongated, divided into three parts: head, trunk, and tail, and there are no limbs or claw-like hind limbs on both sides of the transverse lobe of the lower snakes; The whole body is covered in scales; The head morphology is varied, and the nostrils are located on the snout side, but the hydroids that live in the sea are located on the snout side; Protective hyaline outside the eyeball**, round pupils, vertically oval or horizontally oval, no re-invasive eyelids, and the lens is almost globular; elongated and bifurcated tongue; The maxilla (only snakes of the pit viper family have teeth), maxilla, palatine, pterygoids, and dentates have teeth with curved tips attached. However, the size, number, and structure of teeth vary from one snake to another.

The tail is noticeably shorter than the head.

The habitat of snakes varies from species to species. Some live in caves, some on the ground, some in trees, and some in water. The snake is an ectotherm that has a body temperature that varies with temperature because the snake itself does not have a well-established thermostat to produce and maintain a constant body temperature.

Snakes are carnivores and eat many species of animals, from invertebrates to various vertebrates. It is found all over the world except the North and South poles.