The Complete Works of Wei Zi Dinosaurs

Birds and mammals were badly hit, but they survived. Warm-blooded animals with long hair eventually replaced dinosaurs as masters of the earth, laying the foundation for the birth of mankind.

In the past, all scientists thought that dinosaurs were cold-blooded or warm-blooded like all reptiles, but with the increasing number of fossil data, people's understanding has also changed. Some people think that some dinosaurs may be warm-blooded animals. First of all, they think that some dinosaurs are extremely agile, and they don't crawl on the ground like snakes, but run on the ground with two hind legs, which can reach 20 to 90 kilometers per hour. This requires a strong heart and a high metabolism, which is obviously impossible for cold-blooded animals.