Ancient species: Call me Uncle Tyrannosaurus Rex!

Wu Yu transmigrated to a parallel world with an online game called Earth Online. The rules of Earth Online were that one person was randomly selected from each country to participate. The selected person had to choose a creature as their "natal species" and earn points through daily competitions such as knowledge quizzes and species races, nurturing their natal species and hoping to revert it to its ancient form. Every seven days, Earth Online would also hold a national species duel competition where the participants' chosen natal species would fight each other. The winner would receive rewards, while the loser would suffer natural disasters as punishment. ... In this world where the "survival of the fittest" philosophy permeated the globe, everyone else chose powerful carnivores like tigers and lions, believing that creatures strong now would remain strong in their ancient form. But Wu Yu knew that nature wasn't about "survival of the fittest," but rather "survival of the fittest." Nature didn't always favor the strong; creatures strong now might not have been strong tens of millions of years ago, and creatures weak now might have been the dominant species on Earth tens of millions of years ago. Instead of choosing powerful carnivores like everyone else, Wu Yu focused his attention on the neglected rooster. At first, people didn't take the rooster seriously, but as the competition began, they noticed that the rooster's size was getting bigger and bigger. What the heck is a weight of 14 tons? What's with a body length of 13 meters? A bite force of 6 tons, how are we supposed to compete with that? You're telling me that such a terrifying creature is a rooster transformed? Before the ancient times, you could call me Brother Chicken and I wouldn't mind, but after the ancient times, what should you call me?