65 million years ago, dinosaur species completely disappeared from the earth. However, in Triassic and early Jurassic, dinosaurs still did not become a very powerful species, and almost completely dominated the evolution of the whole animal. At the end of Jurassic, giant sauropods became the largest creatures on earth. When is the end of Jurassic? At the peak of the "golden age" when scientists ruled the earth, they were far superior to other creatures at the same time in diversity, intelligence and size. How did the most legendary species appear and rise in the history of the earth?

Before dinosaurs appeared, there were lizard species on the earth. Although they were not as big as dinosaurs, they had certain advantages over other animals at that time. Paleontologists think? They are the archetypes of dinosaurs that appeared later. Lizards appeared in Carboniferous in several geological ages before Triassic (363 million to 290 million years ago). At that time, people thought that the earliest reptile appeared in the world: west lothian lizard. By Permian, a geological period before the appearance of dinosaurs, the species of reptiles gradually diversified and their shapes began to approach the earliest dinosaurs. Permian is a relatively dry era. Deserts are common. At the same time, gregarious lizards like pterosaurs and Allosaurus are also active in desert oases. In the late Permian, there were two different trends in biological evolution, both of which had a far-reaching impact on the history of the earth. One trend is called dinosaurs, and the other is called mammals.

Just as the evolution of the earth was in full swing, an asteroid larger than the meteorite that ended the dinosaur era 65 million years ago hit the earth at the end of Permian. The impact caused the extinction of most species, but it also became a catalyst for the emergence of dinosaurs. In Permian, real dinosaurs will officially appear. Heiruilong is one of the earliest dinosaurs, with small size and very agile skills. It quickly became a big winner in the survival game. At the end of Permian, there was an empty bone dragon, which was the prototype of many carnivorous dinosaurs and birds. Soon after the Jurassic, herbivorous dinosaurs began to evolve in size in the early Jurassic, and the advantages of size could help them get rid of the pursuit of carnivorous dinosaurs. So sauropods appeared. Giant sauropods pushed the evolution of dinosaurs to the highest peak. Another reason for the appearance of giant sauropods is the climate. According to geological records, dinosaurs were warm and humid in the late Jurassic and could grow to more than 30 meters long. In addition, carnivorous dinosaurs became bigger, more aggressive and threatening. Like Allosaurus in North America. In addition, very special dinosaurs, such as the feathered China arowana, began to embark on the road of bird evolution. Under the influence of climate and living conditions, the late Jurassic was the heyday of the dinosaur era.