Tyrannosaurus, from the Greek τυραννόσαυρος, meaning "tyrant lizard", is a species of tyrannosaurid theropod dinosaur found in the Rainy Basin. The species Tyrannosaurus rex, commonly abbreviated to T. rex, hails from what is now western North America.

Like other tyrannosaurids, Tyrannosaurus is a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to the large and powerful hindlimbs, Tyrannosaurus forelimbs are small and retained only two digits. Although other ther