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Tyrannosaurus is a famous dinosaur genus and a fixture in popular culture. Known colloquially as T. rex, the species Tyrannosaurus rex hails from what is now western North America. Some scientists consider the slightly older Tarbosaurus bataar from Asia to represent a second species of Tyrannosaurus, while others maintain Tarbosaurus as a separate genus. Like other tyrannosaurid theropods, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to the large and powerful hindlimbs, Tyrannosaurus forelimbs were small, and retained only two digits. Although other theropods rivaled or exceeded T. rex in size, it was the largest known tyrannosaurid and one of the largest known land predators, measuring over 12 meters (40 feet) in length and weighing as much as an elephant. Fossils of T. rex have been found in North American rock formations dating to the very end of the Cretaceous Period; it was among the last dinosaurs to exist prior to the Cretaceous-Tertiary extinction event. More than 30 specimens of T. rex have now been identified, some nearly complete, which has allowed significant research into many aspects of its biology, including its life history and biomechanics. However, the feeding habits and potential speed of T. rex remain controversial. (see more...)