Tyrannosaurus rex, also known as Tyrannosaurus rex, is a type of theropod dinosaur and the most representative large theropod dinosaur. Tyrannosaurus rex once roamed an island continent called Laramidia (now located on the eastern foothills of the Rocky Mountains in western North America). The distribution range of tyrannosaurs is wider than other members of the tyrannosauridae family. Its fossils were discovered in various strata of the Late Cretaceous Maastrichtian stage (approximately 68 to 66 million years ago). Tyrannosaurus is the last known member of the Tyrannosauridae family before the Cretaceous Paleogene extinction event, and is also one of the latest non avian dinosaurs to go extinct. Tyrannosaurus rex is currently the heaviest known carnivorous dinosaur.

Tyrannosaurus (Tyrannosaurus) is a genus under Tyrannosauridae. The only effective species is the model species Tyrannosaurus rex or Rexosaurus rex. It is a large carnivorous dinosaur with a length of about 15 meters, a hip height of about 5 meters, and a weight of about 8 metric tons to 13 tons. The Maastricht order, which lived at the end of the Cretaceous, was about 67 million to 66 million years ago. It was one of the last dinosaur populations before the Cretaceous-Tertiary extinction event. Fossils are distributed in the United States and western Canada in North America, and the distribution range is wider than that of other Tyrannosauridae. Western North America in the late Cretaceous period is an independent continent of Larramidia.

Tyrannosaurus rex, also known as Tyrannosaurus rex, is a type of theropod dinosaur and the most representative large theropod dinosaur. Tyrannosaurus rex once roamed an island continent called Laramidia (now located on the eastern foothills of the Rocky Mountains in western North America). The distribution range of tyrannosaurs is wider than other members of the tyrannosauridae family. Its fossils were discovered in various strata of the Late Cretaceous Maastrichtian stage (approximately 68 to 66 million years ago). Tyrannosaurus is the last known member of the Tyrannosauridae family before the Cretaceous Paleogene extinction event, and is also one of the latest non avian dinosaurs to go extinct. Tyrannosaurus rex is currently the heaviest known carnivorous dinosaur.