Hundreds of thousands of years passed unconsciously, and Zhang Jun's Jurassic date came to an end, followed by the Cretaceous era, which lasted about 70 million years and ended 65 million years ago, about 140 million years ago from the 21st century.

During the Cretaceous period, the global climate warmed slightly, the arid zone was expanding, Zhang Jun's original habitat in North America has gradually evolved to arid, so he took the dragon group again for several large migrations, once he chose a direction, that is, the direction of ancient Africa, which was once the birthplace of human ancestors, no matter what caused the emergence of intelligent humans in ancient Africa, it must also be a place with a lot of aura.

Another reason for Zhang Jun's migration to Africa is that in the next few years, the world will gradually appear five continents and four oceans, he does not know the specific age of the formation of the Pacific Ocean, which is inconclusive to the scientific community, but he knows that once the Pacific Ocean is formed, he and the dragon group will be isolated in the Americas, and it will be difficult to enter the broader Eurasian continent and the African savannah.

So Zhang Jun decided to migrate to Africa, and Zhang Jun remembered that in the Cenozoic era after the Cretaceous, there was a Quaternary ice age on the earth, during which most of the world was covered by glaciers, so the closer to the north, the colder the climate, the African continent is closer to the equator, so after the arrival of the distant ice age, the temperature here is helpful for the reproduction of dragons.

At this time, Africa and Eurasia were not completely separated, and in the years that followed, the Indian Ocean and the Atlantic Ocean would slowly take shape, and then the modern contour of Africa would gradually take shape.

When Zhang Jun arrived in Africa, the climate here was warm and humid, and most of the area was covered by jungles, where many types of dinosaurs lived, and this time the dragons settled in a primeval jungle in central Africa, which was also about 100 or more migrations that Zhang Jun carried out.

After this migration, Zhang Jun stayed in ancient Africa for a long time, the long Cretaceous period began, the Cretaceous dinosaurs were more colorful, dinosaurs, a species that was in the dominant position of the earth, underwent a great degree of evolution, there were many branches, large-scale carnivorous dinosaurs gradually increased, and more powerful opponents slowly appeared, such as carnivorous Taurosaurus, Tyrannosaurus rex, velociraptor and other famous killers, all began to appear one after another, competing with Allosaurus for the Cretaceous jungle.

Zhang Jun only wanted to preserve some of the dragons' civilization achievements before the mass extinction time of the Cretaceous period, and further advanced the dragons' ability to use tools and language, so that their brain capacity could slowly expand, and after the mass extinction era, they could retain the low-level wisdom that had begun to take shape.

Countless dinosaurs appeared in the Cretaceous period, all failed to pose a substantial threat to Zhang Jun's huge dragon group, the dragon group with a huge number of strong killers is still the strongest in the world, almost invincible force, only they occupy other people's territory in history, no other dinosaur has the ability to drive them away, even if it is the terrifying killer Tyrannosaurus rex, is also oppressed by the mighty power of the dragon group, unable to raise its head.

During the long Cretaceous period, Zhang Jun taught the dragons from generation to generation, teaching them the skills of using tools, and now all the dragons have begun to eat cooked food, and the use of fire has been promoted, which can greatly reduce the probability of them being infected with parasitic diseases and other diseases, of course, those Allosaurus populations that have been separated from the dragon group, many of them have begun to give up eating cooked meat, and have begun to live a life of drinking blood, the ability to use language and tools, and the degree of civilization has even degraded, which is beyond Zhang Jun's control. He can only keep the more than 100 Allosaurus he leads, and he can inherit some of his wisdom.

After a long period of practice, the dragon group of tools has reached a certain height, the most typical is the construction of the dragon's nest, now the dragon group has known how to use reasonable terrain, build a suitable dragon nest, know how to select materials, understand some basic building techniques.

The long 70 million years have passed in a flash, and the time has reached the late Cretaceous period, during this time, the earth is relatively calm, there are no serious geological disasters, and animals and plants have been reproduced to a great extent.

In the location of Zhang Jun's dragon's nest, the recent heavy rain caused a little collapse of the mountain near the dragon's nest, destroying part of the original dragon's nest.

This time the whole team was mobilized, and they were all busy near the dragon's den, Bald and Blackskin each took a team of Allosaurus to the nearby mountains to carry the rocks, and they had to find enough rocks to replenish the rocks that had slid down the mountain due to the collapse.

Qili, Big Al and Little Al are piling up the dragon's nest in front of the dragon's nest and repairing the damaged parts, while Feige is digging dirt in the nearby mountains with dozens of dragons to fill the gaps between the stones, which already has a preliminary architectural concept, and Zhang Jun plays the role of the commander-in-chief before the dragon's nest and assigns tasks to the detachment.

Before the Dragon's Den, most of the Allosaurus were chattering and screaming, but now their dragon language has become quite mature, and they are able to communicate in simple sentences, except for those small dragons that have not yet grown up, and the communication between the big dragons has become smoother.

"Feige, get your wyvern up to speed, you need more dirt here." When Fei Ge took a dozen flying dragons, bags made of crocodile skin, ankylosaurus skin, python skin and other animal skins, and carried bags of soil on his back to the dragon's den, Zhang Jun said a word to the sky.

"Okay, Chief, there's more dirt over there, I'll lead the Wyvern over there." Fei Ge blinked his clear eyes, waved his paw at Zhang Jun, indicating that it was no problem, and then flew away with the dragon group and continued to be busy.

Qili and Big Al and Little Al are busy, directing a team of Allosaurus to carry stones, piling them on both sides of the cave, repairing the collapsed mountain, the stones they pile up are very neat, symmetrical on the left and right, although there is no exquisite construction technology, but it is very strong and used, one and the other are stacked together at a suitable angle, which can be compared with the self-built earthen houses in the countryside.

"Over there, over there, pay attention to the height, don't make the stones crooked."

"Young man over here, your rocks are at the wrong angle, you need to move a little more to the right."

Qili is directing several teenage dinosaurs to pile up rocks on one side, they are young and inexperienced, so they often do things wrong, and Qili has to correct them frequently. ps: Today's update is a little late, and there will be more in the evening.