According to Yun Lei's assumption, these dinosaurs who are still in the primitive period of ignorance need food most in this space! Because Yun Lei can basically determine that these dinosaurs, whose whole body has grown feathers, should have gradually transformed from the most primitive cold-blooded animals of dinosaurs, like birds, into warm-blooded animals.

There was a time when almost all paleontologists deduced that all dinosaurs were cold-blooded based on some of the remaining branches of dinosaurs, such as lizards and crocodiles.

However, after discovering the extremely strong inheritance relationship between birds and dinosaurs, this original prejudice was broken!

Since all modern birds are endostatics, it is highly likely that their closest common ancestor, dinosaurs, is also very likely! Some paleontologists even believe that the origin of avian thermometabolism is more likely to have occurred between dinosaurs and master dinosaurs, rather than from dinosaurs to birds.

According to paleontologists, current fossil evidence suggests that egg-hatching was present in oviraptorosaurs, suggesting that its body temperature should have been higher than the ambient temperature, and that this small dinosaur should have been an endothermian.

This point of view has caused heated debate.

Of course, this kind of controversy is really just a kind of detailed timing determination. When the dinosaurs began to grow feathers, this part of the feathered dinosaurs had already become homeothermic animals!

Modern bird plumage has two functions, flying, as well as keeping warm. Therefore, the presence of feathers can already be regarded as a reliable sign of homeothermic animals. Especially for dinosaurs, the early original feather structure, such as the feathers of the Chinese dragon bird and the Chinese bird dragon, did not have the function of flying at first, and according to the research of the feather color, it did not have the function of showing off and attracting the opposite sex. Then, the biggest use of these feathers is to keep warm.

As for the aerodynamic structure that these feathers gradually evolved, these dinosaurs could learn to glide. In addition, gradually learning to fly and evolve into a bird is a function of feathers.

Once the phonophobic evolved into a homeothermic animal, the amount of food needed began to increase dramatically.

In contrast to homeothermic animals, cold-blooded animals do not need to use their own energy to warm or cool down. So, a cold-blooded animal of the same weight only needs about one-tenth to one-third of its energy to survive.

Moreover, because cold-blooded animals are more likely to accumulate enough energy, their breeding period is also shorter!

Moreover, because cold-blooded animals only need less energy to maintain body temperature and physiological functions, the energy obtained by cold-blooded animals from food can be used more for growth, that is, cold-blooded animals are more efficient at converting food into body growth than hot-blooded animals.

This is not the case with homeothermic animals, which have a heat-insulating structure such as hair, feathers, and subcutaneous fat, and at the same time, the body itself produces heat. Therefore, the metabolism of homeothermic animals itself is high and fast. In order to maintain body temperature, homeothermic animals have a higher demand for food.

However, according to Yun Lei, these are only the first to learn to use tools, and they don't have such a strong ability to obtain food at all.

According to paleontologists, studies of the odontosaurus found that the saurodontosaurus itself was a carnivorous species, but there were many odontosaurs with small, rough edged teeth and U-shaped jaws, which means that these odontosaurs, without enough prey, had learned to eat grass. Thus becoming an omnivorous species.

This is similar to the distant ancestor of mankind, the mammals that survived the catastrophe of heaven and earth.

The leader of the dinosaur in front of him, although he looked very serious, wielding a spear in his hand, hanging a bow and arrows from his waist, and grinning his teeth, was actually a little timid. The mouth is full of teeth, although there are some sharp teeth, but more of them are molars with rough edges like those of herbivores.

It seems that the dinosaurs that evolved into these odontosaurs have completely become omnivorous.

And the food that Yun Lei took out itself exudes the aroma of Chinese foodies, who have tried their best to concoct from the food after thousands of years. It's very tempting.

Not to mention these terrifying people in the underground world, even those foreigners on the outside world, after smelling and tasting the aroma of these traditional Chinese delicacies, they can only kneel.

Therefore, when these dinosaurs evolved into dinosaurs, they couldn't help but stir their noses when they smelled the fragrance of these foods that Yun Lei took out, revealing a salivating expression.

As Yun Lei guessed, these civilizations were still in their primitive state, although they had broken away from the category of beasts and had wisdom. However, there hasn't been much progress in the ability to get food. Moreover, being trapped in this place, which is not much larger than Bowl Island, is unable to develop further after the population has expanded to a certain extent.

Even the leader of the terror, who took the lead, smelled the aroma of the food, and his eyes involuntarily lit up.

His expression was ready to move.

Yun Lei smiled secretly, it seems that no matter what civilization, or even any race, in the primitive stage, food is the best gift, enough to express goodwill.

The leader of the terrorists who took the lead let out a cry at the cloud thunder, and stretched his neck forward. Although Yun Lei still couldn't understand the bird's language, the actions of this terrifying leader were not much different from the rooster who saw the corn kernels.

This cry is nothing more than asking Yun Lei - did you give me this thing to eat?

Yun Lei then stepped back. This thing is for you to eat!

So, the leader of the terrorists who took the lead picked out a large piece of spiced beef jerky that he thought was the most fragrant from the large pile of food that Yun Lei had left on the ground. I put it in my mouth, bit it twice, and swallowed it.

Yun Lei noticed that when this terrifying leader fed from the ground, he did not use the slightly protruding beak, which looked like a bird's beak, but with the hand with feathers on his arms and like chicken feet.

It seems that it has become a habit to fear people to use their hands to eat, and to use their hands as a universal tool. Just like the Australopithecus man, after walking upright, he removed the burden of walking with both hands and used it to grasp the tools.

And this huge piece of spiced beef jerky is obviously very much in line with the appetite of this terrifying leader. Yun Lei and Rao Ya actually saw a taste of enjoyment from the face of this terrifying leader. After eating a large piece of spiced beef jerky, the attitude of this terrifying leader was obviously eased a lot.