Tyrannosaurus rex, lived in the Maastricht order (MAA) at the end of the Cretaceous period, 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 found in the United States and Canada in North America and are among the last dinosaurs to become extinct. Tyrannosaurus rex is the largest of the family Tyrannosaurus rex. The body length is about 11.5-14.7 meters. The average hip height is about 4 meters. The highest hip height can reach about 5.2 meters, and the head height is nearly 6 meters. The average weight is about 9 tons, (ecological average is about 7.6 tons), the maximum weight is 14.85 tons, and the head length is about 1.55 meters. The bite force is generally 90,000 Newtons to 120,000 Newtons, and the maximum end of the mouth can reach about 200,000 Newtons, and it is also the thickest carnivorous dinosaur. The genus name of Tyrannosaurus rex means "cruel lizard king" in ancient Greek, and the species name means king in Latin.
Near the site where T. rex was found, there are still coniferous plants and their relatives of the T. rex era, which are similar to Florida or southern Georgia, and there are some small trees in this area, about 15 to 25 meters high, and the trunk diameter is less than 0.3 meters. In the era in which it lived, modern plants of all families have appeared. And the number of dinosaurs is reduced compared to the Jurassic, so the environment in which Tyrannosaurus rex lives is not as strange as imagined.
Flowering plants that appeared in the early Cretaceous Period, the Tyrannosaurus rex lived during the period dominated the world's ecosystem, 90% of the leaf fossils were found in North Dakota, and of the more than 30,000 leaf fossils collected, 90% of the fossils belonged to broad-leaved plants.
Tyrannosaurus rex
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![This strange creature is preparing to make a move on the two young dragons below. When it came close and saw Hart's teeth like a light, he immediately turned on reverse mode and fled. Hart looked hidden[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)