How did the birds come and how did the birds come about?

The Origin of Birds The study of the origin of birds has gone through a number of stages.

In 1868, Huxley proposed the hypothesis that birds originated from dinosaurs. Huxley was a well-known British biologist, a staunch supporter of Darwin's theory of evolution, and one of the first scholars to propose that birds originated from dinosaurs.

In 1927, the Danish paleontologist Heilmann published a very classic book "The Origin of Birds" in 1927, in which he proposed that although birds and dinosaurs are very similar, dinosaurs have been very specialized, so birds may not directly originate from dinosaurs, but have a common ancestor with dinosaurs, which is the molars. The so-called alveolar tooth is a fossil group that is more primitive than dinosaurs, this group is considered to have produced dinosaurs, birds, crocodiles and other major modern vertebrates, and it may appear a little earlier, earlier than the Jurassic, Cretaceous Triassic. This doctrine has been prevalent for about half a century since it was proposed.

From 1973 to 1985, the theory of the origin of dinosaurs was revived again. When researchers studied vertebrate fossils, they found that a fossil identified as a pterosaur had feathers, and then found another Archaeopteryx fossil. It was this fortuitous discovery that scholars linked the relationship between birds and dinosaurs.

From 1986 to the present, the theory of the origin of dinosaurs has been prevalent, and more and more fossil evidence supports such a hypothesis.

Hairy dinosaurs from China, such as the Chinese dragon bird, are the first dinosaur fossils to preserve real forked feathers. The discovery of this fossil has caused a great sensation in the international paleontological community, and is considered to be the most important and latest evidence for the theory that birds originated from dinosaurs. Some scholars have even suggested that dinosaurs are not extinct, and that all the living birds we see are dinosaurs, and hummingbirds living in South America naturally become the smallest dinosaurs.

Born or hatched from eggs.

Bird is a commonly used Chinese character, pronounced niǎo or diǎo, which was first seen in oracle bone inscriptions, and its original meaning is long-tailed flying birds, and later extended to flying insects, place names, etc.

Birds, hieroglyphs. The oracle bone inscription of the Shang Dynasty of the word "bird" is generally made in the shape of beak, head, body, feather and foot, and the posture is different, it is difficult to list them all.

Introduction

Another star name. Vermilion bird, the name of the seven houses in the south. "Shu Yaodian": Star Bird in the Sun.

Also the name of the country. "Classic of Mountains and Seas": There are people in the country of Yanchang with a bird's head, and the name is Bird's.

Also the name of the mountain. Bird. "Gazetteer": In the southwest of Shouyang County, Longxi County, Yugong, and finally the south of the bird as far as the bird.

and "The Classic of Mountains and Seas": The mountain of bird danger, the water of bird danger comes out.

Also official name. "Zhou Li, Xia Guan": Shooting birds. "Zuo Chuan: The Seventeenth Year of Zhao": Shao Hui Zhizhi Liye, Ji Yu Bird, is a bird master, and the bird name.

Qin Zhi was the first to have the bird custom. "Historical Records: Qin Benji": Dafei gave birth to two children, one is called Dalian, and the real bird is vulgar. Suo Yin said: In the words of Zhongyan bird, it is a bird customary.

Dan bird, white bird, and insect name. "Xia Xiaozheng": Dan Bird, Dan Liangya. White birds, gnats also.

And the wonderful sound bird. "Lotus Sutra Verses": The Holy Lord of Heaven, the King of Heaven, the sound of Kaling Pinga. Note: Jialing Pinga, Miaoyin Bird also. When the bird does not make a sound, the pronunciation is subtle, and all the heavenly and human voices are not as good, but the Buddha sound is similar, so it is necessary to take the situation.

The Yaolongs and Dendrisaurs, which are found in our country, are the ancestors of birds. When the Archaeopteryx fossil was first discovered, there was a controversy about whether Archaeopteryx was a bird or a dragon, but the lack of fossil evidence failed to overturn it, and the discovery of Zheng's Xiaotinglong completely classified Archaeopteryx as a dinosaur, and Archaeopteryx was the ancestor of the Velociraptor rex, not the ancestor of birds. But Archaeopteryx was an offshoot of the evolution of dinosaurs into birds.

During the Cretaceous period, the evolution of birds also diverged, with the emergence of anti-birds and modern birds. Anti-birds climbed the trees, and now the birds remain on the ground. By the late Cretaceous period, arboreal dinosaurs and anti-birds went extinct along with dinosaurs, but today's birds, which were not dominant in evolution, evolved into today's birds.

The common characteristics of birds are: the body is streamlined (spindle or fusiform) and most of them fly life. The body surface is covered with feathers, and the forelimbs generally become wings (some species have vestigial wings); well-developed pectoral muscles; The rectum is short, the amount of food is large and the digestion is fast, that is, the digestive system is developed, which helps to lose weight and is conducive to flying;

The heart has two atria and two ventricles, and the number of beats is rapid. Constant body temperature. In addition to the lungs, the respiratory organs also have multiple air sacs to assist breathing, so that birds can breathe oxygen through the lungs during both inhalation and exhalation, that is, double breathing.

beaks, toothless, and some bird species have migratory behaviors. Greatly improves the survival of chicks. Birds can nest, incubate, brood, and migrate.

There are many types and quantities, and traces are found all over the world. Some birds live and breed in their reproductive areas all year round, and do not migrate due to seasonal changes, which is called "resident birds".

Categories: Entertainment & Leisure >> Flowers, birds, fish and insects.

Analysis: Many things in the world, you don't ask, I know what it is; When you asked, I was confused. This can be applied to birds. When people ask "what a bird is", many people realize for the first time that they don't really know about birds.

What is a bird? If you simply say that it is an animal that flies in the sky, it is too amateurish. It is true that when we look at the vast sky from afar, those small black dots soaring in the sky are indeed the figures of birds.

However, bats are nocturnal creatures that can fly, but not birds, but mammals; Dragonflies and butterflies also have beautiful wings and can dance in the fields and on the water, and they are not birds; Ostriches, in turn, are authentic birds but cannot fly into the sky due to their weight. If you say that birds are the only animals with feathers, I will look at you with admiration, because you do name the characteristics that distinguish birds from other animals. But, what is a feather?

This is another headache.

Birds are a general term for birds that are higher vertebrates adapted to life on land and in the air. Long feathers, which can maintain a constant temperature of the body; There is a protruding keel protrusion on the chest, and the bones of the whole body are hollow and filled with gas, so the body is light; The forelimbs are winged, the hind limbs walk, most of them can fly, they have a wide range of activities, and some of the wings are degraded and cannot fly, and the activity area is relatively small, such as ostriches, penguins and most poultry. beaks, toothless, and some bird species have migratory behaviors.

Birds are a general term for birds that are higher vertebrates adapted to life on land and in the air. Long feathers, which can maintain a constant temperature of the body; There is a protruding keel protrusion on the chest, and the bones of the whole body are hollow and filled with gas, so the body is light; The forelimbs are winged, the hind limbs walk, most of them can fly, they have a wide range of activities, and some of the wings are degraded and cannot fly, and the activity area is relatively small, such as ostriches, penguins and most poultry. beaks, toothless, and some bird species have migratory behaviors.

This is a white-rumped young bird. The juveniles have a light brown or grayish brown upper body, each feather has a dry white or brownish-white feather stem pattern, a grayish white waist, and a light yellowish brown tail with brown arc lines and nearly white feather stem lines. The chin and throat are pale grayish-brown or gray, with light brown arc-like lines, the thorax and undertail feathers and leg feathers are pale yellowish-brown, each feather has light brown and gray-brown arc-like lines, the abdomen and flanks are grayish-brown and yellowish, and the rest seem to be brother birds.

The bird feeds on plant seeds as its staple food, and is particularly fond of rice. In the summer, it also eats some insects and unripe ears of grain and grass.