Thunder Dragon
Thunder Dragon:
Some dinosaurs have very large bodies, such as Thundersaurus, which is an example. During the Jurassic Period, the climate on Earth was warm and humid, and there were verdant forests everywhere, because these abundant plant foods brought about the prosperity of herbivorous dinosaurs, and Thundersaurus was also active in the plains of what is now North America.
The Thunder Dragon weighed between thirty-five and fifty metric tons, its thick legs, like a tree trunk; its long neck, erect as tall as a seven-story building, and it could be said to be the largest animal on earth. Although the body of the thunder dragon is amazingly large, the temperament is very gentle, usually feeding on plants in the temperate forest, sometimes walking into the swamp, due to the buoyancy of the water, it can reduce the heavy burden on its body, but also can avoid the attack of the ferocious carnivorous dinosaurs like Allosaurus.
Three Dragons
Three Dragons:
The bone plates and bone fragments on the stegosaurus and horned dragons can only be used as passive defense, and there is no way to fight back, and when the dragon appears, the situation gradually changes. It was the largest of the three dragons, with two spear-like horns on its head, the other protruding between the eyes and nostrils. Such a sharp weapon, even the most terrible carnivorous dinosaurs have to make it three points.
Stegosaurus
Stegosaurus:
The stegosaurus that appeared 150 million years ago was characterized by two rib plates that towered off its back and spikes on its tail. Stegosaurus was a herbivorous dinosaur that moved slowly, and the bone plate on its body and the spikes on its tail became the best defense against carnivorous dinosaurs.
Ankylosaurus
Ankylosaurus:
Stegosaurus has bone plates on its body, but where the bone plates cannot cover them, they are still vulnerable to attack. When the stegosaurus gradually disappeared, the ankylosaur (armadillo) covered with bone plates was replaced. The Ankylosaurus is like a tank car with no guns, and even the T-Rex can't do anything about it.
Tyrannosaurus rex
Tyrannosaurus Rex:
Tyrannosaurus rex (Tyrannosaurus rex) was the largest and most brutal of the carnivorous dinosaurs, and the Tyrannosaurus rex appeared at the end of the dinosaur era, about 80 million years ago. The Tyrannosaurus rex was fourteen meters tall, weighed about ten metric tons, and its hind feet were so thick and strong that it could even hold up a rhinoceros each.
From the fossils of the Tyrannosaurus rex, it was found that each of its teeth was as large as the palm of an adult's hand, and even the eyes were larger than a human head. Although most of the body is surprisingly large, the forelimbs of the Tyrannosaurus rex are so small and short that it is even impossible to send food to the mouth, and the killer dragon also has the same habits as the Tyrannosaurus rex, and is a very fierce animal.
Fragile diplodocus
Fragile diplodocus (the largest known dinosaur):
Fragile diplodocus is the largest and heaviest dinosaur ever discovered. It is perhaps the longest vertebrate ever discovered, about 30-40 meters long and weighing about 122 metric tons. Any evolutionary factor that produces a huge body variant begins with the origin of this species. Let's look at studies of giant herbivorous mammals like elephants and rhinos, which have shown that the larger the herbivores, the more efficient they are at digesting food. Since the larger the animal's digestive system, the longer the food stays in the digestive system, so that these large animals can survive on these low-quality foods.
Athlon
Athysopter (Bird of Prey):
Perhaps one of the most familiar dinosaurs, Velociraptor lived about 75 to 71 million years ago. Athysosaurus is a medium-sized galloping dragon, with adult velociraptors about 6.8 feet long, about 1.6 feet tall, and weighing about 15 kilograms. The head of the velociraptor can grow up to 9.8 inches long, in a unique inverted arc, and the upper surface is concave inward and then the lower side is convex outward. Both the upper and lower jaws have 26-28 wide teeth, and the teeth on both sides are sharper than the front teeth, perhaps to suit its ability to prey on fast-moving prey. It is a bipedal, a carnivore with a stiff tail and sickle-shaped claws on its hind limbs.
Show-jawed dragon
Hidenossaurus (the smallest known dinosaur):
The animal is only as big as a turkey and weighs only 0.26 grams lightly, and it lived in Europe about 150 million years ago. It is the smallest known dinosaur. It is one of the few dinosaurs in the world that is certain of what it ate because it retained remnants of small lizards in their bellies. Although it was not recognized as a species at the time of its discovery, Itachiosaurus was the earliest dinosaur known from a more complete skeleton and the smallest, closest to the early birds Archaeopteryx. Therefore, this dinosaur is also famous outside the paleontological world
There have been many opinions about the real cause of the extinction of dinosaurs since ancient times, but there is no certain argument, so it is still an unsolved mystery, and only some of the more well-known claims are described here:
One. Meteorite Collision says:
In 1980, American scientists found high concentrations of iridium in the strata of 65 million years ago, and its content exceeded the normal content by tens or even hundreds of times. Such concentrations of iridium can be found in meteorites, so scientists have linked it to the extinction of dinosaurs. Based on the iridium content, it was also deduced that the impacting object was an asteroid equivalent to a diameter of 10 kilometers. Such a large meteorite hitting the earth is definitely an unparalleled blow, calculated by the intensity of the earthquake, it is about 10 on the Richter scale, and the crater produced by the impact will be more than 100 kilometers in diameter. It took 10 years for scientists to finally get preliminary results, and they found this big pit in the strata of the Yugatun Peninsula in Central America. It has been estimated that the diameter of this pit is between 180 km and 300 km. Now, scientific workers are still doing further research on this big pit.
___ Scientists began to paint a picture of that majestic scene 65 million years ago. One day, the dinosaurs were still eating and drinking carefreely in the paradise of the earth, when suddenly a blinding white light appeared in the sky, and a boulder with a diameter of 10 kilometers equivalent to the size of a medium-sized city fell from the sky. It was an asteroid that crashed headlong into the sea at a speed of 40 kilometers per second, knocked out a huge deep pit on the seabed, the seawater was rapidly vaporized, the vapor was sprayed into the sky for tens of thousands of meters, and then the tsunami was as high as 5 kilometers, and spread at a very fast speed, the soaring water swept through everything on the land, and the raging waves swept across the surface of the earth and converged on the back end of the impact point, where the huge seawater force triggered a strong volcanic eruption on the Deccan Plateau, and at the same time changed the direction of the movement of the earth's plates. What a terrible disaster. Meteorites hitting the Earth produced an overwhelming amount of dust, polar snow melted, plants were destroyed, and volcanic ash filled the sky. For a time, the sky was dark, the temperature plummeted, the rain was torrential, the flash floods broke out, and the mudslides swept away the dinosaurs and buried them. In the months and years that followed, the sky was still dusty and cloudy, the earth was in a low temperature due to the lack of sunlight all year round, and the vast earth was silent for a while. Thus came an end to an era in biological history.
Two. Comet Collision says:
The "comet collision theory" is based on the paleontologist - David?? Laup and John?? Sepkowski's argument that the extinction of paleontology occurs every 26 million years was born out of the beginning. Louis?? Albarez gave this argument and his theory to the astrophysicist, Charlie? Mula, later believed that it was due to the gravitational pull of the Sun's half-star Vengeance Goddess, which periodically pushed the comet toward Earth.
Three. Orogeny says:
The orogeny that occurred at the end of the Cretaceous period dried up the swamps, and many of the dinosaurs that made the swamps their home could not survive. Because of the change after the gas, the plant also changed, and the herbivorous dinosaurs could not adapt to the new food, and went extinct one after another. Herbivorous dinosaurs went extinct, carnivorous dinosaurs also lost their attachment, and as a result, they also went extinct. This extinction process lasted 10 million to 20 million years. At the end of the Cretaceous period, it eventually became extinct on Earth.
Four. Climate change says:
As a result of plate movements, the currents change, causing dramatic changes in the climate. The harsh climate caused the plants to die, and the lack of food for the dinosaurs led to their demise.
Five. Volcanic eruptions say:
Because of the eruption of the volcano, carbon dioxide was spewed out in large quantities, causing the earth's acute greenhouse effect, causing food to die. Moreover, volcanic eruptions cause a large amount of salt to be released, the ozone layer is broken, and harmful ultraviolet rays illuminate the earth's surface, causing the extinction of living things.
Six. Ocean tide receding says:
According to Buck, when the oceans receded and the land bordered, organisms came into contact with each other, resulting in the extinction of some kinds of organisms. For example, kangaroos, kangaroos can survive on the island continent of Europe, but they are extinct when they encounter other animals on the South American continent.
In addition to this relationship between eating and being eaten, there are also infectious problems such as diseases and parasites.