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Tyrannosaurus (pronounced /tɨˌrænɵˈsɔːrəs/ or /taɪˌrænɵˈsɔːrəs/, meaning 'tyrant lizard') was a genus of theropod dinosaur. The species Tyrannosaurus rex ('rex' meaning 'king' in Latin), commonly abbreviated to T. rex, is a fixture in popular culture. It lived throughout what is now western North America, with a much wider range than other tyrannosaurids. Fossils are found in a variety of rock formations dating 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.
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Allosaurus vs T-Rex, 
