There were 5 dinosaurs in total and each of them was around 20 feet tall. They had small arms hanging from their body and a slightly round head.
Zhou Fan decided to name them tyrannosaurus rexes, or T-rex for short. The T-rexes were clearly excited when they saw the gigantosaurus. They looked at him as if he was nothing but prey, similar to the way that the gigantosaurus looked at the ankylosauruses.
Looking at them, Zhou Fan felt that the gigantosaurus would win in a 1v1, but with 5 t-rexes, it stood no chance. Apparently, the gigantosaurus thought so too as it started to slowly back away from the group of t-rexes.
Of course, the t-rexes didn't let it go far before surrounding it. Sensing its entrapment, the gigantosaurus roared into the air and charged towards one of the t-rexes.
ROAR!
Once the gigantosaurus reached the t-rex, it bit at its face. Unfortunately, the t-rex wasn't as helpless as all of its other victims. It fought back without much trouble and seemed fairly equal to the gigantosaurus.
It only had to 1v1 the gigantosaurus for a few seconds before the rest of the t-rexes showed up.
There was no suspense or unexpectedness as the gigantosaurus soon fell. The t-rexes had killed it without sustaining any major injuries.
As they ate at its body, Zhou Fan moved on. The t-rexes were likely the peak predators around the area, so he decided to move on to other areas and see what other existences there were.
After leaving the forest, Zhou Fan soon arrived at a swamp. Two foot deep water covered the ground. It was stinky, moldy, and dirty. Zhou Fan truly couldn't imagine what dinosaurs would choose to live there.
After traveling around the area for a few days, Zhou Fan was surprised to discover that many of the dinosaurs he saw in the forest also existed in the swamp.
The only dinosaurs he didn't see were the brontosauruses and t-rexes. Zhou Fan assumed that the brontosauruses didn't live in the swamp because it didn't fit their habitat, while the t-rexes didn't live in it because there was another apex predator more suited to the environment.
As for what the predator was, Zhou fan looked forward to finding out. After journeying through a fair amount of the swamp, Zhou Fan finally discovered the apex predator.
There was a dinosaur that walked on four legs yet still was 30 feet tall. It had what seemed like a semi-circle fin on its back, however, Zhou Fan could tell that it was actually its spine.
Zhou Fan only took one look before he called it a spinosaurus.
He watched it hunt with efficiency, despite not living in a pack. Even with its size, it moved faster than any land dinosaur Zhou Fan had seen.
Zhou Fan continued to look through the swamp for another day before he left it. Without a doubt, the spinosaurus was the apex predator of that area.
Zhou Fan continued to move around the 10,000 miles surrounding the mountain for many days before he found an incredible environment.
It looked like a mesh of the many terrains he had seen before, and everything was much bigger. There were rocky areas, mountainous areas, swampy areas, plains, forests, redwood tree areas, and many more.
If there was ever a dinosaur haven, this would be it. With the size of the environment, there were sure to be many more dinosaurs and many new species. Perhaps there would even be an apex apex predator.
Zhou Fan traveled around the big area, seeing many more apex predators than before. There were t-rexes and spinosaurus fighting each other, and even a much bigger gigantosaurus than the one he had seen before.
He also saw many new species of dinosaurs, some big and some small. By the time he had combed through half of the area, he had already named enough dinosaurs to fill up a book.
Just as he was crossing through the exit of the redwood area and entering the mountainous/rocky area, Zhou Fan felt the ground tremble beneath his feet. It wasn't fast as if a big animal was running, but slow as if a mountain was taking a step.
Zhou Fan could tell that the source of the sound was behind the mountain that stood in front of him. He quickly climbed up it and reached the peak. The sight he saw over the mountain was something he would never forget.
There was a huge oasis surrounded by mountains. In the distance, Zhou Fan could see a dinosaur as big as a mountain itself. It was hundreds of feet tall and covered with what seemed to be a rocky pattern.
It somewhat resembled a brontosaurus, but was much much bigger. Even a dragon would find it hard to match up to such a giant being in terms of size. With a single glance, Zhou Fan could tell that it was the true king of dinosaurs.
He named it the titanosaurus due to its titanic size. Zhou Fan looked in the rest of the oasis and spotted many different species. He then set off on an adventure to discover every dinosaur species and create a book detailing them.
The entire thing took almost a year before Zhou Fan finished. He had enjoyed it thoroughly.
After he finished, Zhou Fan silently left the dinosaur area and returned to the skies. Since a year had passed, the expansion of the world would be completed in a few days.
Zhou Fan had planned on creating more opportunities, but the dinosaur book had taken up too much time.
He planned to go into seclusion soon, but he first decided to publish his book in one of the celestial libraries.
He arrived in the celestial lands quickly, where he published the book of dinosaurs and where to find them under the name That_Dinosaur_guy.
He didn't sit around and wait for the results and instead started to look around the new and improved central city.
After about a year, the city had been repaired and improved to a much better state than before.