Reconstruction of T. rex, a large carnivore theropod from the Cretaceous period. — Reconstruction, not a photograph

Theropoda › Tyrannosauridae › Tyrannosaurus

T. rex

Tyrannosaurus rex

CretaceousCarnivoreTheropodLarge

Length 12.4 m
Mass 8800 kg

Tyrannosaurus is a genus of large theropod dinosaur. The type species Tyrannosaurus rex, often shortened to T. rex or colloquially T-Rex, is one of the best represented theropods. It lived throughout what is now western North America, on what was then an island continent known as Laramidia. Tyrannosaurus had a much wider range than other tyrannosaurids. Fossils are found in geological formations which have been dated to the late Maastrichtian age of the late Cretaceous period, 69 to 66 million years ago, with isolated specimens possibly indicating an earlier origin in the middle Campanian age. It was one of the last known members of the tyrannosaurids and among the last non-avian dinosaurs to exist before the Cretaceous-Paleogene extinction event.