What are the reptiles?

Reptiles evolved from amphibians, while mammals and birds evolved from reptiles. Modern turtles, crocodiles, lizards and snakes are all reptiles. Because the eggs fertilized in vitro by amphibians must be produced in water or wetlands to avoid drying up and dying; But reptiles are fertilized in vivo, fertilized eggs (commonly known as eggs) have shells, and a layer of amniotic membrane protects embryos, so reptiles can lay eggs on land. In the history of the earth, reptiles became the first animals to appear on land. Some reptiles later evolved into mammals, while others evolved into birds.

Reptiles sound scary. In fact, except for a few crocodiles, poisonous snakes and poisonous lizards, most reptiles are harmless to humans, and they are also afraid of people, such as turtles and turtles.

Reptiles are all temperature-changing animals with spines and lungs, and their body temperature will change with the temperature of the environment. In addition, reptiles evolved from amphibians, and mammals and birds evolved from reptiles. Because the eggs fertilized in vitro by amphibians must be produced in water or wetlands to avoid drying up and dying; But reptiles are fertilized in vivo, fertilized eggs (commonly known as eggs) have shells, and a layer of amniotic membrane protects embryos, so reptiles can lay eggs on land. In the history of the earth, reptiles became the first animals to appear on land. Some reptiles later evolved into mammals, while others evolved into birds.

About 1 100 million years ago, there were more reptiles than now, which was then called the reptile age. Dinosaurs were the largest reptiles at that time. The existing reptiles are divided into five categories:

Crocodiles, snakes, turtles, lizards and crocodiles.

Dinosaurs were born long before humans came to the earth. They are the largest animal group that has ever appeared on land. The dinosaurs we saw in cartoons or movies no longer exist on the earth. Therefore, no one has ever seen the real dinosaur. Scientists describe the shape of dinosaurs according to their fossils.

As we know, dinosaurs can walk on land or water, and some can fly in the air. They are real amphibious athletes. Most dinosaurs were huge. For example, brontosaurus is 30 meters long and about three stories high. However, there are also dinosaurs less than 60 cm long.

Dinosaurs belong to ancient reptiles, with many kinds, some like lizards (black dragon); Some are like cows (three dragons); Some people have bone plates, like handfuls of swords stuck in their backs (Stegosaurus). In terms of eating habits, dinosaurs were divided into two types: carnivores who ate animals and herbivores who ate algae and other plants. Dinosaurs died out suddenly after10.6 billion years. Until today, scientists can't solve this mystery.

Some people keep lizards as pets. When it is attacked, it will play dead, deform, change color, or automatically break its tail to defend itself, but after the danger has passed, it will return to its original state, which is very interesting.

Lizards are also masters of sports. Different kinds of lizards have different sports styles, some can swim, some can fly, some can crawl and run! There are about 3,000 species of lizards in the world, such as Komodo monitor lizard in Indonesia, which is three meters long and weighs 140 kg. It is the largest lizard.

Lizard is a reptile, belonging to the suborder Lizard. Its whole body is covered with horny scales. Most of them have limbs, and a few are viviparous. Courtship is rude, and the male lizard begins to mate after chasing the female lizard. Lizards mainly feed on insects and small animals, and most of them move during the day. They often need to bask in the sun to regulate their body temperature, and they can be found in mild climates.

Every night, geckos will appear on glass windows, ceilings or walls to catch mosquitoes. Their kung fu is really good. They can climb back and forth easily without slipping. Even on the ceiling, they can walk on their backs. Very impressive!

In fact, this is because the gecko has valves on its limbs and its head has adsorption ability, so it can walk on a smooth plane. Humans regard it as the overlord of climbing the wall, and because of its good upside-down and adsorption skills, it is called "Gecko Kung Fu". Gecko also has a skill, that is, when it is attacked, it will automatically break its long tail (cut itself) to divert the enemy's attention and escape safely. After a period of time, the broken tail will regenerate.

Gecko, also known as Shougong, is a reptile belonging to the Shougong family of sauropods. Distributed in all parts of Taiwan Province Province. Geckos are like lizards, covered with small granular scales; Body temperature and body color will change with the living environment. The pupil of the eye is very special, slit-shaped, similar to that of a cat. Can make a sound. Some geckos make a loud noise.

Almost everyone has heard the story of the race between the tortoise and the hare. The tortoise carries a heavy shell and races with the clever white rabbit. Although its speed is not as fast as that of the white rabbit, it won the championship with endurance and won a down-to-earth reputation.

The turtle's hard shell is called tortoise shell, which is the turtle's hiding device. When in danger, the tortoise will retract its head and tail into its shell to protect itself. In ancient China, tortoise shells were also used for divination and prediction of future events, and the results were engraved on tortoise shells. This way of writing is "Oracle Bone Inscriptions". In addition, some people use tortoise shells as coins. The ring pattern on the tortoise shell actually represents the age of the tortoise, and each ring represents one year old.

Tortoise is an oviparous reptile, belonging to the order Tortoise in classification. Turtles live in rivers and lakes on land, sea or fresh water. In terms of habitat, turtles are divided into two categories: turtles and tortoises. They are warm-blooded animals and need sleep. Although turtles have no teeth, their sharp jaws can also cut the tender leaves of fish, shrimp, insects or other plants. Turtles are very long-lived animals, and some of them can live to 100 years old. It can really be called "Grandpa Tortoise"!

A turtle is a bit like a tortoise, but it has no hard shell and only soft skin.

There are about 20 kinds of soft-shelled turtles, which are few in number, but they live in water and swim fast, so it is difficult to catch them. Moreover, it often bites when it is disturbed. If you are bitten, you'd better put the turtle in the water, and it will let go naturally.

It is an oviparous reptile, belonging to Tortoise, distributed in Asia, Africa and North America. With a long soft nose, it can be used as a breathing tool in water. There are no scales on the head and limbs. They have many aliases, such as turtle, foot fish, tuanyu, and water fish. Generally speaking, the body length of soft-shelled turtle is less than 30 cm, but the larger soft-shelled turtle can reach 90 cm.

Have you ever seen a wallet, belt or leather shoes made of crocodile skin? These things are not only hard and strong, but also have layers of scales. Crocodile pictures are beautiful and practical, and they are very popular with people. Due to overfishing, many wild species are threatened, and crocodile farming has become a new business.

Crocodiles themselves are not beautiful. Even, many people think it is ugly and afraid of it. This is because crocodiles are big and have sharp teeth. They float like dead wood in swamps or water. When other animals or people approach, they will be bitten or swept down by their big mouths or tails, and then dragged into the water and drowned.

Crocodiles are reptiles belonging to the order Crocodiles, which are distributed in tropical and subtropical regions. Crocodiles produced in Chinese mainland are called Yang Zijiang crocodiles, but they are not produced locally, but imported from abroad. Crocodiles are warm-blooded animals. When the weather is hot, they will hide in a cool place and open their mouths to dissipate heat. When it's cold, dig tunnels to avoid the cold. Laying eggs in sandpits or leaves, during the incubation period, the mother crocodile will always take care of it nearby until the baby crocodile breaks out of its shell.