Tyrannosaurus rex has a big head. Tyrannosaurus rex has short forelimbs and two fingers in each hand; The hind legs are big and powerful, and each foot has three toes. Every finger and toe has claws. Tyrannosaurus rex has a thin, hard tail. It has 60 teeth, each of which is 9 inches long and very sharp.

Stegosaurus, also known as bonobo dragon, was 7 meters long. If you count the height of the bone plate, its height can reach 3.5 meters. The whole body is like an elephant now, but only with a pitifully small head and a brain the size of a walnut. Because the forelimbs are short, the whole body leans forward obviously. There are two rows of triangular plates along the back of the neck to the middle of the tail, and there are two opposite corners at the ends of the plates, which are its weapons.

Plesiosaur looks like a snake passing through a turtle shell: its head is small, its neck is long, its trunk is like a turtle, and its tail is short. Although the head is small, but the mouth is very big, there are many slender conical teeth in the mouth, fishing for a living. Many kinds of bodies are very huge, reaching 1 1~ 15 meters, and some kinds reach 18 meters. The limbs are specialized into fleshy flippers suitable for paddling, so that plesiosaurs can not only move freely in the water, but also climb ashore to rest or lay eggs and breed offspring.

2. Seek knowledge about dinosaurs

Dinosaurs are the general name for reptiles on the earth10.3 billion years ago. There are many kinds of them, and their size, shape and living habits are different. Land, sea and sky are all sites of dinosaurs and reptiles. As big as Mamen Xilong found in Hechuan County, Sichuan Province, China, it is 22 meters long, 3.5 meters high and weighs 40-50 tons. Usually living in a lake with a water depth of 5~ 10 meters, using the buoyancy of water to float the heavy body and feed on algae in the water. The whole body of the parrot dragon is only the size of a puppy. Some can fly in the air, such as long-tailed beak dragon, with sharp teeth and long tail. At the end of the tail, there is a membrane shaped like a fly swatter, and the flying tool is the wing membrane. Some are overlords in the sea, such as Himalayan ichthyosaurs, which eat meat and are good at swimming. Its upper and lower jaws are particularly long, forming a long kiss, with teeth in its mouth, and its shape is very similar to that of dolphins today. Some warriors on land, such as Stegosaurus, were 6 meters long, with small heads and high arches on their backs. There are two rows of upright triangular bone plates with bone spurs at the tip of the tail, which are weapons against the enemy. By about10.3 billion years ago, the dinosaurs that ruled for a period of time were completely extinct on the earth due to the changes of topography and climate caused by strong crustal movement. The reason for the extinction of dinosaurs is still inconclusive, but it should be noted that the reasons are various and complicated, which is the result of the interaction between the external environment changes and the internal factors of dinosaurs at that time. dinosaur

Dinosaurs are Mesozoic reptiles, which appeared 245 million years ago and flourished 65 million years ago. Or both dinosaurs and plesiosaurs and pterosaurs. Dinosaurs suddenly disappeared in a certain period, which became a mystery in the evolution history of life on earth, and no one has solved it so far. In the past, all living things on the earth were recorded in fossils. Many dinosaur fossils have been found in Mesozoic strata. A large number of bones or various shapes can be seen in it. However, in the subsequent Cenozoic strata, there were no dinosaur fossils at all. It can be inferred that dinosaurs died out together in Mesozoic.

3. Knowledge about dinosaurs

Dinosaurs are Mesozoic reptiles, which appeared 245 million years ago and flourished 65 million years ago.

Or both dinosaurs and plesiosaurs and pterosaurs. The sudden disappearance of dinosaurs at the end of Cretaceous 65 million years ago became a mystery in the evolutionary history of life on earth. This mystery has not been solved so far.

In the past, all living things on the earth were recorded in fossils. Many dinosaur fossils have been found in Mesozoic strata.

A large number of bones or various shapes can be seen in it. However, in the subsequent Cenozoic strata, there were no dinosaur fossils at all.

It can be inferred that dinosaurs died out together in Mesozoic. There are many kinds of dinosaurs, and their shapes and habits are quite different.

Among them, the big one can be as big as dozens of elephants combined; Small, but almost like a chicken. As far as eating habits are concerned, there are docile herbivores and fierce carnivores, as well as omnivorous dinosaurs who are both vegetarian and vegetarian.

4. What is the knowledge about dinosaurs?

Dinosaur (English name: dinosaur) is a reptile that appeared in Mesozoic (Triassic, Jurassic and Cretaceous). Its vigorous limbs, long tail and huge body are the portrayal of most dinosaurs. They mainly inhabit woodland or open areas in lakeshore plains (or coastal plains). 184 1 year, when British scientist richard owen studied several lizard-like bone fossils, he thought they were left by some prehistoric animals and named them dinosaurs, which means "scary lizards".

The sudden disappearance of dinosaurs at the end of Cretaceous 65 million years ago became a mystery in the evolutionary history of life on earth. This mystery has not been solved so far. In the past, all living things on the earth were recorded in fossils. Many dinosaur fossils have been found in Mesozoic strata. A large number of bones or various shapes can be seen in it. However, in the subsequent Cenozoic strata, there were no fossils of non-bird dinosaurs at all, thus inferring that non-bird dinosaurs died out together in Mesozoic, and now only birds are left. Most scientists agree that "birds belong to dinosaurs".

There are many kinds of dinosaurs, and their shapes and habits are very different. The largest fragile double-chambered dragon may be more than 50 meters, while the smallest hummingbird may be less than 10 cm. As far as eating habits are concerned, there are docile herbivores and fierce carnivores, as well as omnivorous dinosaurs who are both vegetarian and vegetarian. Dinosaurs as a whole are very big. According to dinosaur standards, lizard's foot is one of the behemoths. In the long dinosaur era, even the smallest sauropods were larger than other animals in their habitats, while the largest sauropods were several grades larger than any animals that appeared on the surface.

Most dinosaurs were much smaller than large sauropods. The existing evidence shows that the average size of dinosaurs changed constantly in Triassic, Early Jurassic, Late Jurassic and Cretaceous. Most theropod dinosaurs weighed between 100 and 1000 kg, while most Holocene carnivores weighed between 10 and 100 kg. The estimated weight of dinosaurs is mostly between 1 and 10 metric tons. A study by the National Museum of Natural History in London pointed out that the average weight of dinosaurs was about 100 kg, while the average weight of new generation mammals was between 2 and 5 kg.

Judging from the existing intact bones, the tallest and heaviest dinosaur is Giraffatitan brancai (formerly known as Brachiosaurus). The fossil of long-necked dragon was found in Tanzania from 1907 to 19 12. A skeleton model composed of several individuals of similar size is now on display at the Humboldt Museum in Berlin. The model is 12 m high and 22.5 m long, and the estimated live weight is between 30 and 60 metric tons. The longest dinosaur is Liang Long, which is 27 meters long. It was discovered in Wyoming, USA on 1907 and is now on display at Carnegie Museum of Natural History in Pittsburgh, Pennsylvania.

Extended data:

Nesting, spawning and caring for the next generation are also part of dinosaur life. Dinosaur nests are generally mud nests or pits in the sand. Some dinosaurs built nests in breeding areas, while some special species returned to the same nesting site year after year to breed. Some female dinosaurs left after giving birth, leaving the eggs to hatch themselves; And some female dinosaurs will stay at the edge of the nest to protect eggs and newly hatched young dinosaurs.

Like most birds and reptiles, dinosaurs probably had only one cloaca-a place where feces, urine and germ cells were excreted together. If so, we can speculate that the male and female dinosaurs aimed at each other during mating, and then the male dinosaur's * * * entered the cloaca of the female dinosaur to mate.

However, male dinosaurs may not have * * *. In this case, they may reproduce by spraying * * * into the cloacal cavity of female dinosaurs like some birds-this mating method is called "cloacal kiss" by experts.

Baidu encyclopedia-dinosaur

5. All the knowledge about dinosaurs

Dinosaur is a reptile that once ruled the earth. At present, there are about 800 known dinosaur species, which are divided into two categories: dinosaurs and dinosaurs. Among them, some are vegetarians and some eat meat. Some are stupid, others are flexible; Some crawl on land, some jump and run, and some fly in the air. In recent years, an upsurge of digging, researching and developing dinosaurs has risen quietly all over the world. It has attracted the attention of biologists, geographers, sociologists and even philosophers. The countries with the largest dinosaur resources in the world are China, the United States, Canada, Mongolia, Argentina and Brazil. The most famous places in China are Yunxian County in Hubei, Erenhot, Xixia in Henan, Zigong in Sichuan, Lufeng in Yunnan and Heyuan in Guangdong. Only Yunxian County, Hubei Province can really compare with Heyuan. There are two similarities in dinosaur resources between Heyuan City and Yunxian County, Hubei Province. First, dinosaur eggs were first discovered in 1970s, but they were really found in large quantities in1March, 996. 1In July 1997, dinosaur bones were found in Yunxian County, Hubei Province. According to experts' appraisal, this is the birthplace of "Dragon Egg Fossil * * *", while the keel fossil was discovered in Heyuan City in July, 1999 by/kloc-0. Become the second largest birthplace of dragon eggs in China. The first dinosaur bone fossil was discovered and collected by Robert prout, the administrator of Oxford Museum in England, in 1677. 100 years later, many explorers and scholars have successively discovered and studied dinosaur fossils, but almost none of them have been correctly identified. +084 1 year. Richard owen, a paleontologist, first put forward the word dinosaur based on some large reptile fossils. The word comes from the Greek words "deinos" (meaning Kobe, scary) and "sauros" (meaning lizard), and is translated as "dinosaur" by Japanese and China scholars. After the concept of "dinosaur" came out, scholars carefully observed and identified the dinosaur fossils found. Further excavation was carried out. The excavation of Asian dinosaurs was not carried out until after the 20th century. The earliest dinosaur fossils in China were found in 1902 (Heilongjiang), and later a large number of dinosaur fossils were unearthed in many parts of the country, including famous dinosaur fossil burial sites in Lufeng, Yunnan, Laiyang, Shandong, Zigong, Sichuan and Inner Mongolia. Lufeng and Zigong also established dinosaur museums respectively. The first dinosaur festival in Lufeng was held in 199 1 year. China can be called "the dinosaur country of the world". "dinosaur" is not a taxonomic term, but a popular name. Dinosaurs are divided into two groups: 1. The main feature of sauropods (sauropods) is that the structure between ilium, ischium and pubis, which make up the waistband, is similar to that of other reptiles. That is, three shots or three shots at the waistband. It is divided into two suborders: (1) theropod: Tyrannosaurus Rex, Deinonychus, Slender Dragon, etc. (2) sauropods: Liang Long, Lei Long, Lufenglong, Mamenxilong, etc. Second, ornithoptera's main feature is that its bone structure is similar to that of birds, and its pubic bone points backward. In addition, it has front teeth and buccal muscles. It is divided into five suborders: (1) Birds: Iguanodon, Duckbilled Dragon, etc. (2) Ceratosaurus: protoceratops, Ceratosaurus, Parrotbill, etc. (3) Ankylosaurus: Arthropod, Spinosaurus, Ankylosaurus, etc. (4) Stegosaurus: Stegosaurus, etc. (5) Its limbs are built directly under the body. This structure has advantages over other reptiles (such as crocodiles) in walking and running. According to the structural characteristics of dinosaur belt, it can be divided into two categories: sauropods and birds and dragons. The difference between them lies in their belt structure: the lizard's belt is three shots and pubic. The waistband of ornithogastria has a great expansion in the front and back of the intestine. There is a big pubic protrusion on the front side of the pubic bone, which extends below the intestine, and the back side of the pubic bone extends parallel to the ischium to the front and bottom of the intestine. So from the side, the pelvis is radiant. Whether sauroptera or ornithogastria, their belts have a small hole between the intestine, ischium and pubis, which other reptiles with various uses do not have. Compared with all other reptiles with various purposes, dinosaurs are the closest relatives. Sauropods are divided into sauropods and theropods. Sauropods are divided into protosauropods and sauropods. Protosauropods mainly lived from Late Triassic to Early Jurassic. It is an omnivorous medium-sized dinosaur. Sauropods mainly live in Jurassic and Cretaceous. Most of them are huge vegetarian dinosaurs with small heads, long necks, long tails and spoon-shaped teeth. Mamenxilong, a famous representative of sauropod, was born in Sichuan and Gansu provinces of China in the Late Jurassic, and its neck length consisting of 19 cervical vertebrae was about half of its body length. Theropod dinosaurs lived in the late Triassic. Walking on two feet, with sharp claws at the toes, a well-developed head and teeth as sharp as daggers or knives in the mouth. Tyrannosaurus rex is a famous representative. The ornithopoda is divided into five categories: ornithopoda, stegosaurus, Ankylosaurus, Ceratosaurus and pachycephalosaurus. The suborder ornithopoda is the group with the most fossils in birds' buttocks and even in the whole dinosaur category. They walk on two or four feet. The mandible has only one front tooth bone, and the teeth only grow on the cheeks. The crowns of maxillary teeth are bent inward, and the crowns of mandibular teeth are bent outward. They lived from the late Triassic to the Cretaceous, and they were all vegetarian dinosaurs. Stegosaurus. Four-legged walking has an upright bone plate on its back and two pairs of bony spines on its tail. Stegosaurus lived mainly from Jurassic to early Cretaceous, and was the first extinct dinosaur category. Ankylosaurus was short and stout, covered with a bony deck, and fed on plants, mainly in Cretaceous. Ceratosaurus was a vegetarian dinosaur that walked on four legs. The back of its skull expanded into a cervical shield, and most of it lived in the late Cretaceous. The parrot-billed dragon found in northern China is a kind of horn.

6. Knowledge about dinosaurs

Dinosaur is a Japanese biologist's translation of English Dinosauria, namely "scary lizard" (fear lizard). The Chinese community has accepted Japanese translation and should know that it does not belong to loong. 186 1 The archaeopteryx fossils found are very similar to those of Megagnathus, but the difference is that the archaeopteryx fossils have traces of feathers, which indicates that dinosaurs and birds may be close relatives. Since 1970, many studies have pointed out that modern birds are probably the direct descendants of theropod dinosaurs. Most scientists regard birds as the only dinosaurs that have survived and developed to this day, and a few even advocate that they be classified into the same category. Crocodiles are modern close relatives of another kind of dinosaurs, but their relationship is farther than that between dinosaurs and birds. Dinosaurs, birds and crocodiles all belong to the main evolutionary branches of reptiles, which first appeared in the late Permian and became the dominant land animals in the middle Triassic.

All dinosaurs were land animals. Many prehistoric reptiles are often informally identified as dinosaurs by the general public, such as pterosaurs, ichthyosaurs, plesiosaurs, black dragon and Pan.

Dinosaur is a Japanese biologist's translation of English Dinosauria, namely "scary lizard".

All dinosaurs are land animals. They think that dragons are the length of scale insects and plesiosaurs, but the relationship between them is farther than that between dinosaurs and birds. The fossils of birds and monitor lizards are very similar. 186 1 archaeopteryx fossils discovered.

1842, these are not dinosaurs, and the classification of modern animals is not exactly the same. There are dinosaur remains on seven continents all over the world. English dinosaurs came from deinos Saurosc (lizard or reptile) in Greece, such as Japan. Later, this evolutionary branch first appeared in the late Permian, and a few scientists even advocated that they should be grouped together. The Chinese community accepted Japanese translation. Many studies have pointed out that modern birds are probably the direct descendants of theropod dinosaurs: pterodactyl, and Chinese groups have accepted Japanese translation. Until the paleontologist Mantel discovered dinosaurs and compared them with iguanas. Crocodiles are modern close relatives of another kind of dinosaurs, and they became the dominant terrestrial animals in the Middle Triassic. There were not many dinosaur fossils found at that time, but the archaeopteryx fossils had feather marks. Because these countries have always had legends about dragons, we should know the Chinese meaning of dragons. Most scientists believe that birds are the only dinosaurs that have survived and developed to this day. Many prehistoric reptiles are usually informally considered dinosaurs by the public. This "scary lizard" or "scary reptile" refers to large extinct reptiles (actually not), Panlong (Allosaurus and Pterosaur) and so on. Since the discovery of dinosaur fossils in Antarctica in 1989, British paleontologist Charles Owen coined the word "dinosaur", knowing that it does not belong to loong. Actually. Dinosaurs, Europeans have known that there are many grotesque huge bone fossils buried underground. Since1970s, dinosaurs have been translated into English Dinosauria by Japanese biologists, which shows that dinosaurs and birds may be close relatives, such as snakes, called dragons. Crocodiles belong to the main evolutionary branch of reptiles, and scholars in China and other countries have translated them into dinosaurs. There are at least 650 to 800 genera of dinosaurs described in the world (paleontological species, black dragon, ichthyosaur). The scientific community initially identified this as a group of reptiles similar to lizards but long extinct, but from a scientific point of view. For Owen at that time.

Long before dinosaurs were discovered.

7. dinosaur knowledge

Dinosaur (English: Dinosaur) is a terrestrial animal that lived about 235 million to 65 million years ago and was able to walk upright on its hind legs. It is a diverse group of dominant vertebrates in Mesozoic. Most of them belong to terrestrial reptiles, but they can walk upright and rule the global terrestrial ecosystem for more than 654.38+0.6 billion years. It is said that it is a vertebrate rather than a reptile, because dinosaurs were once classified as reptiles, but it does not conform to one of the basic characteristics of reptiles: the crawling way of walking and the cold-blooded animals that have been questioned. Time of emergence and extinction: dinosaurs first appeared in Triassic period about 240 million years ago and died in Cretaceous period about 65 million years ago. Dinosaurs finally died out in Neogene Paleocene 63 million years ago.

Dinosaurs Dinosaurs are the general name for reptiles on the earth10.3 billion years ago. There are many kinds of them, and their size, shape and living habits are different. Land, sea and sky are all sites of dinosaurs and reptiles. As big as Mamen Xilong found in Hechuan County, Sichuan Province, China, it is 22 meters long, 3.5 meters high and weighs 40-50 tons. Usually living in a lake with a water depth of 5~ 10 meters, using the buoyancy of water to float the heavy body and feed on algae in the water. The whole body of the parrot dragon is only the size of a puppy. Some can fly in the air, such as long-tailed beak dragon, with sharp teeth and long tail. At the end of the tail, there is a membrane shaped like a fly swatter, and the flying tool is the wing membrane. Some are the overlords in the sea, such as Himalayan ichthyosaurs, which are carnivorous and good at swimming. They have long jaws and teeth in their mouths and look like dolphins today. Some warriors on land, such as Stegosaurus, were 6 meters long, with small heads and high arches on their backs. There are two rows of upright triangular bone plates with bone spurs at the tip of the tail, which are weapons against the enemy. By about10.3 billion years ago, the dinosaurs that ruled for a period of time were completely extinct on the earth due to the changes of topography and climate caused by strong crustal movement. The reason for the extinction of dinosaurs is still inconclusive, but it should be noted that the reasons are various and complicated, which is the result of the interaction between the external environment changes and the internal factors of dinosaurs at that time.

8. Knowledge about dinosaurs

A good book I recommend is Encyclopedia of Dinosaurs.

Because I like dinosaurs very much and want to know more, I bought a dinosaur encyclopedia to read. The detailed information and wonderful pictures in this book make me more interested in dinosaurs.

When I opened the book, the first thing I saw was that dinosaurs were the floorboard of reptiles on the earth10.3 billion years ago. There are many kinds of them, and their size, shape and living habits are different. Land, sea and sky are all sites of dinosaurs and reptiles.

Then vivid pictures came into my eyes, as big as Mamen Xilong in Hechuan County, Sichuan Province, China, with a total length of 22 meters, a height of 3.5 meters and a weight of 40-50 tons. Usually living in a lake with a water depth of 5~ 10 meters, using the buoyancy of water to float the heavy body and feed on algae in the water.

The whole body of the parrot dragon is only the size of a puppy. Some can fly in the air, such as long-tailed beak dragon, with sharp teeth and long tail.

At the end of the tail, there is a membrane shaped like a fly swatter, and the flying tool is the wing membrane. Some are overlords in the sea, such as Himalayan ichthyosaurs, which eat meat and are good at swimming. Its upper and lower jaws are particularly long, forming a long kiss, with teeth in its mouth, and its shape is very similar to that of dolphins today.

Some warriors on land, such as Stegosaurus, were 6 meters long, with small heads and high arches on their backs. There are two rows of upright triangular bone plates with bone spurs at the tip of the tail, which are weapons against the enemy ... By about1300,000 years, the dinosaurs that ruled for a period of time were completely extinct on the earth due to the changes in topography and climate caused by strong crustal movement. After reading this book, I still want to know something about dinosaurs, because this knowledge is far from enough, and knowledge will never be learned, so I will study hard to revitalize China in the future and make the world a human home full of knowledge, love and friendship.

I hope you will read this book when you go back. Label:.

9. dinosaur knowledge

The discovery of dinosaurs

People who discovered dinosaurs: 1822 Englishman Mantel (1790- 1832).

People who named dinosaurs: 1842 Englishman Owen (1804- 1892).

The survival time and species of dinosaurs

The earliest dinosaurs: the black dragon and the cross dragon that began to live in South America in the late Triassic.

When did dinosaurs go extinct? About 6500 years ago, at the end of Cretaceous, dinosaurs became extinct.

How many kinds of dinosaurs are there? It is estimated that there are about 900 to 1200 species of dinosaurs. Scientists believe that the dinosaurs that have been discovered are about 1/4 of those that once existed.

Dinosaurs are the best

Which dinosaur is the tallest: Keelung, a long-necked vegetarian dinosaur like Brachiosaurus, raised its head as high as 17 meters.

Which dinosaur is the heaviest: As far as we know, the polar dragon is the tallest and heaviest. It may have weighed 100 tons when it was alive. But a dinosaur bone that seems to belong to brachiosaurus was found in 1987. Probably from a dinosaur weighing about 130 tons.

Which dinosaur is the longest: Zhenlong, a long-necked vegetarian dinosaur like Lei Long. According to an incomplete skeleton discovered by 1985, scientists believe that this dinosaur should be more than 40 meters.