"World's Largest Dinosaur", a 4-times-life-size replica of Tyrannosaurus rex. Tyrannosaurus, meaning 'tyrant lizard', is a genus of theropod dinosaur. The famous species Tyrannosaurus rex ('rex' meaning 'king' in Latin), commonly abbreviated to T. rex, is a fixture in popular culture around the world. It lived throughout what is now western North America. Fossils of T. rex date to the last three million years of the Cretaceous Period, approximately 68 to 65 million years ago; it was among the last non-avian dinosaurs to exist prior to the Cretaceous-Tertiary extinction event. 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, though unusually powerful for their size. Tyrannosaurus was one of the largest known land predators, measuring up to 13 metres (43 ft) in length, up to 4 metres (13 ft) tall at the hips, and up to 6.8 metric tons (7.5 short tons) in weight. This replica is a tourist attraction in Drumheller, Alberta, Canada.