Tyrannosaurus Rex, a Tyrannosaurus Rex, lived in the late Cretaceous, about 68.5 million to 65 million years ago, and was one of the last non-avian dinosaur species before the Cretaceous-Tertiary extinction event. Fossils are distributed in North America, the United States and Canada, and are among the latest dinosaurs to become extinct.

Tyrannosaurus rex is the largest kind of Tyrannosaurus rex. The body length is about 1 1.5- 14.7 meters. The average hip height is about 4 meters. The highest hip height can reach about 5.2 meters, and the highest head height is nearly 6 meters. The average weight is about 9 tons (the ecological average is about 7.6 tons), the heaviest weight is 14.85 tons, and the head length is about 1.55 meters. The bite force is generally 90,000 Newton-1.20,000 Newton, and the maximum at the end of the mouth can reach about 200,000 Newton. It is also the strongest carnivorous dinosaur.

Near the place where Tyrannosaurus rex was found, there are conifers and their close relatives in the era of Tyrannosaurus rex. The scenery at that time was similar to Florida or South Georgia. There are some small trees in this area, the height of which is about1525m, and the diameter of the trunk is less than 0.3m. In the time when it lived, modern plants of all families appeared. Compared with the Jurassic period, there are fewer kinds of dinosaurs, so the environment in which Tyrannosaurus Rex lived is not as strange as expected.