Sander's study is from the 19th century paleontologist Edward 德林克科普 observations began. Popular Science noted that the body of animals increased with the evolution of the development of this theory is known as the "popular rule." Vertebrate Paleontology in Beijing, China Institute of Anthropology and Ancient Law of experts Daiweihuoni science (David Hone) that the body has many huge evolutionary advantage. He explained: "They are not easy to become prey in search of food or mate object advantage over its competitors. We also know that large animals in general are more vulnerable to the threat of extinction." " 提供更好的翻译建议 感谢您为 Google 翻译提供翻译建议。 提供更好的翻译建议： zsneirong
"Movie" Jurassic Park "exaggerated descriptions and turkey sub about the same size so that the rapid Long (Velociraptor) became famous. Issue an Alan H. Turner and his colleagues reported that the briefing, Velociraptor forelimb on the depression that These will not fly Chi Long may have feathers. To determine which non-avian dinosaurs may have had feathers more difficult because feathers generally preserved in the fossil record is not down. Study of a sample of the ancient Mongolian Velociraptor biologists took note of its ulna with a section called Hane, spacing rules, depression, depression spacing of about 4 mm. The researchers concluded: These depression may be a fixed sub-feather quill of. Turner and his colleagues estimate that there may be a Raptor 14 Such a plume root ganglia. Dinosaur fossils is almost complete, it is alive, when there may be 1.5 meters long, about 15 kilograms.
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"Abeli small dragon and Tyrannosaurus forelimbs as they were very well-known that more than 10 m length of the forelimbs of the animals, the length of not more than 1 meter sounds strange, but despite the hand Abeli constructing the complete dragon preserved (a forum for an owner is a bone bar, which is wrong, because the dragon Abeli though the hand is small, but over all Tetanurae the structure must be complete, including many of the fingers), The Tyrannosaurus rex's small forelimbs in fact there are three fingers (though a very small), this and the original Tetanurae the same, meaning that Abeli dragon and a Tyrannosaurus rex forelimbs is reduced and there is no major structural change.

However, the small forelimbs with traces of muscle attachment, showing Tyrannosaurus rex forelimbs have considerable power. As early as 1906, Osborne had discovered that this feature, he speculated that the forelimbs are mate to seize the spouse. There is also a widespread argument is Tyrannosaurus rex's forelimbs are used to get up to, but this can not explain Abeli dragon forelimb, because the length too short.

In fact forelimb is a trend to narrow, such as Carcharodontosaurus and Giganotosaurus and Allosaurus than the forelimbs was also reduced, indicating the face of new, more general bird hipped dinosaurs, the role of the forelimb is limited, and forelimb larger or smaller role, when the Tyrannosaurus jaw bite the use of struggling prey, the forelimbs can be fixed or live prey. Finally a hypothesis has been supported by biomechanical studies. Tyrannosaurus rex's forelimbs are very thick hard bone can withstand a greater carrying capacity. Complete Tyrannosaurus rex grew biceps can lift 199 kilograms in weight; biceps can increase this value. Tyrannosaurus limited range of movement of the forearm, shoulder and elbow can only be hand-made 40 to 45 degrees of rotation. The Deinonychus on the shoulder elbow and hand can make 88-100 degrees of rotation rate, the human shoulder joint can make 360-degree rotation, hand elbow can make 165-degree rotation range. Tyrannosaurus heavy arm bones, acute strong muscles, and limited range of rotation, showing that their forelimbs may be used to quickly catch on struggling prey.
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Use of a crocodile and chickens are born who confirmed the model, Hutchinson and Garcia on the tyrannosaurus rex (Tyrannosaurus rex) is able to run the controversial issue was studied. Literature, the estimated maximum speed of the Tyrannosaurus vary from walking speed to 11 meters per second, and then to the running speed of 20 meters per second, there. According to extensor muscles on the fast run the minimum number required to estimate the results of the new projections made that Tyrannosaurus rex and other large dinosaurs could not run the.
A small amount of evidence suggests that with its existing sibling species, like crocodiles and birds, dinosaurs also know to look after his cubs in the hatchery. Now, in China's Liaoning Province Ornithischia newly discovered dinosaur Psittacosaurus sp.'s A very compelling fossil specimens, provided us with more and more reliable evidence. We can see from the specimens, an adult individual and 34 pups were squeezed in a half-square-meter area. The posture of these animals live shows, they are buried alive when a sudden, this scene reflects a real-time.
"Chishui City in Guizhou Province has recently decided to close billion foreign capital in the world, one of the few concentrated areas of natural Cyathea Chishui River to build the" China Eco-Jurassic Park, "an attempt to reproduce the two million years ago, the Jurassic era.

Experts found here in 1983, thousands of hectares "dinosaur food" Cyathea tree, but so far found no traces of dinosaurs. The Jurassic era, where home really a dinosaur? If so, where to go in the end of dinosaurs? Why it has not found dinosaur fossils? If not, thousands of hectares of Cyathea tree represent? Why Cyathea tree to grow so far in this busy?

Return to the Jurassic

In 1983, an expedition team found the Chishui River Gold shagou Cyathea large tree, a discovery that leads to this remote valley of China's world-famous. In 1984, China established a National Nature Reserve in Guizhou Chishui Alsophila spinulosa, is China's first to Cyathea and other rare and endangered plants and natural ecosystems as the main object of protection of protected areas to protect an area of 13.3 thousand hectares, is the world's few Cyathea Natural concentrated distribution area.

Alsophila spinulosa is an ancient origin of the large tree ferns, their populations 一亿八千万年 before the dinosaurs co-prosperity with the health to enjoy a "living fossil" of the reputation for the state-level protected plants. Health and environment is desirable Alsophila Mesozoic Jurassic period of "sanctuary."

Experts believe that the Jurassic era there are three important features: a thick red sandstone, south subtropical climate and primitive natural environment.

Guizhou Normal University, Professor of Geography and Biological Sciences TU Yu-lin said that marked the development of the Jurassic era of the formation of red sandstone landform called Danxia landform, Chishui valley is a typical representative of China's Danxia landform. Cyathea Chishui National Nature Reserve, Senior Engineer, Zhao Xin-yi, in fact the name is Jurassic red beds in the Cretaceous red beds.
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"To answer this question, there are several ways. Some of the dinosaurs become fossils preserved stomach contents, these straightforward tell us of their Last Supper. Some are considered the fossil dinosaur dung, told us the dinosaurs food is difficult to digest things. But the evidence is not only extremely rare, and were considered to be dinosaurs found in the stool is not necessarily a dinosaur. Carnivorous dinosaur tooth shape, the prey with the teeth marks left on bones by comparing and the evidence in the fossil record is very common, but also provides a more reliable evidence. But this method can not be used in food plant dinosaur body.

One way is to study the eating dinosaur's teeth planted a tiny structure (tooth surface scratches and small points). Quantitative study of the micro-structure of the teeth can be distinguished dinosaurs were grazing or eating leaves. Those grazing the surface of the animal's teeth, not many small point, but with a large number of scratches; while those who ate the animal leaves the surface of teeth, there are many pits (which is caused due to hard trees), and scratches. The teeth of mammals have been very broad, and mammal teeth can be identified on the scratch they eat specific plants. As the geological history of the evolution of different plant produces a variety of ways to resist the fresh plant animals. Them through changes in their chemical composition and in the leaves and stems to add more fiber, make them harder to digest and chew animals. Some of the stems of plants added to the composition of opal phytolith, to make them harder to chew the stems, so the different plants in the animal's teeth, left a different mark. On the micro-structure of human teeth studies have found that different foods (such as wheat and barley), in the teeth on the left a different micro-structures. In the Early Cretaceous angiosperm radiation, leading to great changes in the plant kingdom, but also correspond to ornithopod specialization.

We (the British scholar and his Chinese female students) Application mammals mature Dental Research methods, ornithopod micro-structure of the teeth were studied to understand the Early Cretaceous earth-shattering changes, which have taken place in how the Food and change.

We (the British scholar and his Chinese female students) also studied the application of this approach dinosaur chewing way. Scratch the direction of dinosaur teeth told us of their activities in the direction of the mouth, while the extent of tooth scratches parallel to tell us the way with a specific chewing. Scratch in a specific direction of the frequency allows us to distinguish different ways to chew some different directions. The previous method of combining these methods, you can help us understand the direction and intensity of the dinosaurs chewing tension. Preliminary studies have shown that chewing ornithopod way than we previously thought is far more complex.
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"Continuity in cold-blooded (variable temperature) Animal view of scholars primarily on the basis that reptiles, like dinosaurs, and now belongs to relatively lower animals, crocodiles, frogs, snakes are typically cold-blooded. The body temperature of these animals as the outside temperature changes in the lift, you can save the consumption of physical strength without the need for a strong heart to maintain blood circulation, the skin does not need to have sweat glands, sweat encountered high temperature is used to maintain a constant temperature of various parts of the body. Most of the cold-blooded animals have a "dormant" feature, to find a suitable temperature of the cave to prevent the body temperature dropped below 0 ℃, otherwise it should be frozen dead.

Advocates dinosaurs were "cold-blooded to say" scholars trouble. Yes ah, Could dinosaurs have to be "dormant" do? Then a large body hiding shelter where it? During hibernation how to solve security problems? If you do not "dormant." The cold winter is cold-blooded tough season, ah, dinosaurs is how to do it through the long winter? In addition, even cold-blooded, body temperature is too high or too low, lack energy, such as crocodiles at about 35 ℃ when the temperature can be so easily. By what means they get the best temperature requirements? Is mainly the sun, to get the energy from sunlight, temperature gradually rose to about 35 ℃.

So, what is a huge dinosaur on optimal temperature requirements? If you also rely on the sun, it is difficult to justify, after speculation the heaviest 80-ton dinosaur, so giant, relying on the sun to heat up, have to constantly turn a huge body, finished one side and then sun drying the other side, simply could not imagine! Moreover, in order to survive need to keep eating dinosaur food appetite is very large, the total can not be lazy all day sun ah!

Therefore, some scholars have put forth the dinosaurs of "warm-blooded animals," the body temperature constant, just like the elephant. According to evolutionary theory, there is a dinosaur was bird ancestor. Want to know dinosaurs are laying eggs, and birds, recent excavations of dinosaur fossils found to have traces of feathers and soft tissue, while the birds are warm-blooded animals, body temperature constant, feathers in order to keep out the cold. This theory seems reasonable.

However, "warm-blooded animals that" encountered a greater trouble, is still a huge dinosaur body caused by problems, is ah, maximum height of 9 meters above the dinosaurs, more than 20 meters in length and weighing up to 80 tons, required a huge heart of how ah! In order to promote such a large amount of blood to maintain blood circulation to meet the needs of all parts of the body ah! Even the most simple dinosaur blood circulatory system, once drawn, flatly rejected by the people immediately, the animal will never be able to have such a powerful heart of its blood supply.
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"Dinosaur skull fossils on the size of the eyes, you could reflect the size of the eye. In general, larger eyes, the eyes the greater, accordingly, the better vision. In addition, the growth of the eye location is also good and bad eyesight impact, is located in front of the skull's eyes, their visual acuity better than in both sides of the skull, and that the more the distance between the eyes wide to the outside world more accurately differentiate the location of an object.

Most plant-eating dinosaur had big eyes, which for them to early detection of distant predators in order to take effective defense strategy was very useful. Herbivorous dinosaurs in the eye's biggest devaluation ornithopod, because their skull show a "big and round" eyes. Ornithopod's superior vision, so that they have "trouble" case, all the way to discover a danger signal, and timely action is needed.

Sauropod dinosaurs also has a great eye, good vision, coupled with their unusually long neck and head raised high, making the sauropod dinosaurs in a large number of dinosaur taxa, with the most wide field of view. Dragon Sword Dragon class and the class A relatively small eyes, their visual acuity worse than in the previous two types of dinosaurs some. This may be with their head low, long-term vision to live in a narrow environment.

Most carnivorous dinosaur with a pair of big eyes, their sharp-eyed, vision Diocesan. Among them, particularly Deinonychus, bird-like dragon claw dragon and narrow vision, etc. the best. Their eyes is not only big, but separated by about a more open, location, front, with "Big World, insight into the MSCRM" three-dimensional vision. These agile predator with three-dimensional vision, be able to accurately see the distance of the prey, in order to quickly capture them.

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"Dinosaurs in the animal classification system, to the Class of reptiles under the Saurischia and Ornithischia. Reptilia one of the characteristics of animals is not a constant body temperature. Therefore, people generally agreed that before the dinosaurs should also be cold-blooded animal. Cold-blooded animal due to metabolic slow, the body produces very little heat, so also known as cold-blooded. In contrast, some animals due to high metabolism, the body produces more heat, so that the body temperature is higher than the ambient temperature, but also maintain a constant, such an animal called a thermostat animals, also known as warm-blooded animals. Are animals, birds and mammals are warm-blooded, in addition to all the animals are cold-blooded animal.

With the expanded in-depth study of dinosaurs, people from the traditional form of description, classification and identification of development to the physical, ecological, behavioral habits such as research, as well as skeletal structure, composition of research and study of genetic material and so on. In this process, some scientists dinosaurs were cold-blooded animal's views of the doubt and waver in the 20th century, since the 70's, proposed the "blood of dinosaurs" theory. The past 20 years, the discussion on the blood of dinosaurs reached a climax, makes a variety of reasons to deny the view of dinosaurs as cold-blooded animals, and even think that this is a revolution in the ancient biology.

Dinosaurs were reptiles upright walking, they stop the activity, the completion of feeding, to avoid predators, reproduce and coordinated behavior in group activities. In these activities, most agile dinosaur, sport faster, with a strong operational capacity, their fast-moving nature of this standing and to consume more than crawling and slow movement of energy. The energy consumption required by the quick release of a large number of metabolic energy to complement, rather inevitably accompanied by a fast metabolism, high body temperature constant. Therefore speculated that some dinosaurs were warm-blooded animals without reason.

Dinosaur bones on a cross-section, showing a large number of Harvard University's board structure and management at Harvard's, Harvard's pipe is a place through the blood vessels and nerves. This structure in the hot-blooded mammals and birds of the bones is very common in the few cold-blooded animal. Therefore, the scholars engaged in research in this area should be that dinosaurs, like mammals and birds are warm-blooded animals.
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"Animal life span, often associated with growth patterns. Limit the growth of non-restricted animals compared with the growth of animals and long life. If we are animals of the non-limited growth models for the study of dinosaurs, some taxa of Dinosaurs hatched from eggs to adulthood out of time required are: Protoceratops need 26 years -38 years, medium-sized sauropod dinosaurs need 82-118 years, the giant sauropod, such as the Brachiosaurus, you need a hundred years . So, if the length adult dinosaurs, and then be able to live on the same length of time, Brachiosaurus can live 300 years or so.

Another issue affecting animal growth factor is the speed of their metabolism. On average, the hot-blooded vertebrate of the growth rate, at least 10 times faster than the cold-blooded animals. Grow faster, shorter life expectancy; grow more slowly, the longer life expectancy.

What has the metabolism of the dinosaurs do? They are warm-blooded animals, or cold-blooded animals? This is a correct estimate of dinosaur life as a key. A lot of evidence shows that many dinosaur taxa are warm-blooded animals. If this is true, will use the current Health and growth patterns of vertebrate blood to calculate the life of dinosaurs. If the individual can live dinosaur blood for several decades to 100 years.

In short, the dinosaurs have long passed away, we are still unable to accurately understand what they can Huoduo Jiu. Some paleontologists, in some dinosaur bones to study the growth rings found: These dinosaurs death at the age of 120 years old. Therefore, some people believe the life of dinosaurs may be longer, that may live to be 100-200 years old.

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"On the color of dinosaurs, there is no evidence to be retained, it is not known. Therefore, the relevant body color of dinosaurs are based on the inferences and descriptions are reptiles, and biological principles of adaptation to speculations. Are reptiles, most species the color of a single, it is estimated that the majority of dinosaurs should also be monochromatic, such as dark green, brown, gray and so on. Some species may also be, as is health monitor lizards - Gila, as colorful. Different patterns and colors are different types of the characteristics of the dinosaur logo, to facilitate the identification between individuals. Bright colors can be toxic to some small dinosaurs warning color to warn other carnivorous dinosaurs Do not to violate, the protection of their own role.

Based on the origin of birds from reptiles, or even originated in the early theropod dinosaurs of views, so, some people believe the color of the skin of dinosaurs and birds should be a beautiful color of their feathers, like colorful, gorgeous eye-catching.

Even some scientists have also made bold to assume that the individual may also like the dinosaur is born chameleon like, you can change the color. The ability to change the color to make them during the breeding season, easy to find a spouse, or the color line and the environment, from the discovery of predators, which will help to protect themselves, and even different colors can also be used to adjust the heat absorption of sunlight in order to regulate body temperature.

Wide variety of dinosaurs, probably should be the color of the bar scene.
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"According to the speed of movement of the dinosaur research, scientists believe that dinosaurs even at 5-8 km / hour low-speed walking, walking for 12 hours a day, dinosaurs can also marched 3,000 kilometers in two months. Therefore, the dinosaur groups can only be achieved within a year back and forth between north and south migration.

There is evidence that some dinosaurs are still among the various continental blocks migration. The part-time in the Cretaceous, the Arctic, North America and Asia, between the connection point, such a bridge to make dinosaurs migration between the two continents possible. Dinosaur fossil evidence strongly supports the existence of the proliferation of bi-directional movement because it is now known Cretaceous dinosaurs in North America in almost every section has its own representatives in Asia. For example, the duck-billed dinosaur, and dinosaurs on ceratopsians are mainly distributed in North America and East Asia, to illustrate these two regions, the Late Cretaceous dinosaur group has a very close relationship.

The Australian continent and the Antarctic continent found several dinosaur fossils, showing in Europe, North America, some species are closely related. Description The land mass was once linked, the occurrence of dinosaur migration and proliferation, in slowly until after separation.

Dinosaur migration theories about, and we look forward to more and more systematic evidence to explain it.
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"Now reptiles such as snakes, lizards, etc., in the cold winter comes, mostly to cease their activities, have plunged into the underground caves, eat or drink, do not move, Shuiqi great feel. This perception sleep I could go on a long sleep coming warmth of spring has been only revived again come back to open water cut-off.

Reptiles are cold-blooded animal, commonly known as cold-blooded animals. Of their relatively low levels of the body's metabolism, producing less heat, coupled with body surface did not like the feathers of birds, mammals, as the thermal insulation of the hair structure, it is not a constant body temperature may rise as the temperature changes in the external environment changes . When the ambient temperature is too high or too low will affect their normal life. Only suitable for external temperature, the temperature in the most suitable condition, will they be agile, lively, four feeding, breeding future generations. . In contrast, mammals and birds, because they have a perfect body temperature regulation mechanism, with a high level of metabolism, the body can produce more heat to warm themselves, and through the body surface of the hair, feathers for insulation, through sweat evaporation and exhaled heat and other forms to distribute excess heat - cooling, so temperature can be maintained relatively stable, free from the external environment the impact of hot and cold. Therefore, mammals and birds are warm-blooded.

Into the winter, temperatures slowly lower the body temperature of reptiles is also decreased, metabolism slowed down and finally penetrate into the cave, relying on weak geothermal and low metabolism sustain life. Hibernating reptiles from the cold to the injury, it is a poor low temperature adaptation.

In the Mesozoic Era, known as the king of the dinosaurs reptiles is also need to hibernate it? The answer should be negative. Imagine, a few meters, tens of meters long and weighs several tons, dozens of tons of dinosaur can penetrate into the ground do hibernation? It is clearly impossible! If unable to penetrate into the cave, but do not eat not move to "sleep" on the ground, forming lying dead silence everywhere scenery do this not funny?

The ancient geography, ancient climate data show that dinosaurs dominated the Mesozoic Era, the Earth's climate was warmer than the present number, there was no significant seasonal changes, there is no significant temperature difference between day and night, north and south poles of the temperature much higher than it is now, there is no cold the world a warmer. In the wilderness on toward flat, rivers, lakes broad cloth, Pine, cycads, ginkgo and other gymnosperms covered with vast land is green everywhere in the world with one of the wonderful vibrant scene.

Dinosaurs that live in such a warm, but the prehistoric environment of adequate food, there is no cold, they do not need hibernation.
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"Gastrolith with a grinding of food to help digestion. Reptiles and mammals of different teeth, there is no differentiation of form and function. Mammals have specialized grinding food, white teeth (molars), eating the right foods, in particular, is a full grind plant food, after digestion and absorption by the gastrointestinal. But reptiles do not molars, with the animal's teeth patterns are the same. Crawling animal's teeth, only the cutting action of the bite, usually do not wear Chan features. Did not grind the food is not digestible, nutrient absorption is difficult, in particular, like an earthquake this huge dragon dinosaur eat every day a surprising number of plant branches and leaves, how to digest? Dinosaur evolution in the long term, access to go through the gastrolith grind food to help digestion characteristics. They eat at the same time eating some of a certain size of the stone, and let the stones remain inside the crop and gizzard. In the cyst developed a strong muscle contraction, the stone repeated on food extrusion, friction, ultimately crushed raw food. Full of food, after grinding through the digestion in the intestines break down nutrients absorbed by the intestinal wall, sent the body by the blood circulation for cell use, the formation of fecal residue be excreted from the cloaca Kong. The above description will enable us to better understand those who head small, weak teeth, sauropod dinosaur, is how "processed" they swallowed a large number of food.

Many dinosaur fossil skeleton, are the preservation of gastrolith. This shows that the dinosaur digestion process and today's birds are very similar to the digestive process.
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Scientists have long thought that the dinosaur's lungs as the bird's lungs. The closest relationship between the two. But the Oregon State University, Ruben and others of a study of dinosaur fossils soft tissue samples and found that the dinosaur's lungs more like a modern E-type mesh. Birds is through a special "mobile systems" breathe, regardless of breath or breathing, the system will supply to the lungs. The E-type head with a membrane lung, breathing, muscle movement so that rib cavity to expand, inhaled air. This is the so-called "rib breathing." Mammalian structure also completely different with the former two. Breathing mammals, by the diaphragm to assist. Breath, the diaphragm arch; inhale, the diaphragm smoothing, so that the pressure to the lungs when inhaling are smaller. Ruben, who found the dinosaur seems to not only divide the lungs, as well as diaphragm. Dinosaurs at rest speculation that they use rib breathing, diaphragmatic breathing with activities. As the oxygen-rich, so their activities are more capable than any living reptiles can do.
"Long-necked sauropod dinosaurs living in the Jurassic and Cretaceous. The last century, the early sauropod dinosaur fossils were first discovered, its neck was described as nearly level. But recently discovered fossils were re-erected : It's head is far above the ground, with swan-like curve of the neck is almost perpendicular to the ground. It also raises the blood circulation of such dinosaurs as the head to provide blood to the controversy, some researchers even think that it may be have more than one heart. The original fossil specimens are very heavy and fragile, difficult to move their joints, making it difficult to determine its initial shape of the neck. Steven and Parrish developed the "DinoMorph" software to simulate two kinds of long-necked Lizard foot dinosaur that forms the neck of Diplodocus and Apatosaurus. The software simulates the movement of each of the spine neck geometry details, has been a complex three-dimensional picture. The results show that the neck of their time is almost at the level of relaxation, a small downward-sloping angle. Head off the ground very close to one another, compared with the neck down angle. Two kinds of dinosaurs, the neck is not a traditional hypothesis considered to be as soft, Diplodocus only to the first Department of lifting more than the back, Apatosaurus flexibility slightly better. This means that the long-necked sauropod dinosaur along the lake to eat the plants growing in the ground, rather than to eat the leaves like giraffes.
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"Just over 1.5 billion years ago, Earth's rulers are dinosaurs, of which the main characters is a sauropod dinosaur. Sauropod dinosaur is a plant-eating dinosaurs, the largest of more than 30 m in length, very long neck and tail , thick limbs sustain, such as barrel-like body, the family also includes Liang Long, Brachiosaurus, Brontosaurus.

Reflects the contradictions of natural selection

For a long time, biologists an unprecedented large sauropod dinosaur body is full of all sorts of confusion. How they have such a huge size? Why on earth not reach other terrestrial animals, such a "tonnage"? Now, the Earth's largest land animal is the African elephant, but the weight of 6 tons. Even in the dinosaur family of sauropod dinosaurs belong to heavyweight. Adult T-rex weighs only 7 tons, and the largest non-sauropod dinosaurs, known as the giant dinosaurs in China Shantungosaurus nothing but the weight of 16 tons.

Paleontologist at the University in Bonn, Germany Madingsangde (Martin Sander) released the results of his research until these questions have no convincing answers. Sander said: "In the evolution of dinosaur posture issues, the theory we are now more clearly structured." Over the past six years, Sander led a team of international scientists has cracked the mystery of sauropod dinosaurs. Their research results indicate that sauropod dinosaurs have many unique biological characteristics of the combined effect of these characteristics, they have a unique large body.

Sander's study is from the 19th century paleontologist Edward 德林克科普 observations began. Popular Science noted that the body of animals increased with the evolution of the development of this theory is known as the "popular rule." Vertebrate Paleontology in Beijing, China Institute of Anthropology and Ancient Law of experts Daiweihuoni science (David Hone) that the body has many huge evolutionary advantage. He explained: "They are not easy to become prey in search of food or mate object advantage over its competitors. We also know that large animals in general are more vulnerable to the threat of extinction."

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