There is only one recognized species its scientific name means “tyrant reptile king.” This theropod was widespread across North America, with known fossil sites including the Hell Creek Formation (Montana, South Dakota, and North Dakota), the Livingston Formation, Ferris Formation, and Lance Formation (all in Wyoming), the Laramie Formation and Denver Formation (both in Colorado), the Javelina Formation (Texas), the McRae Formation (New Mexico), and North Horn Formation (Utah), all in the United States, as well as the Scolland Formation (Alberta) and Frenchman Formation (Saskatchewan), both in Canada.
Tyrannosaurus rex represents perhaps the most well-known group of dinosaurs, the tyrannosaurids. Tyrannosaurus is a genus of very large theropod dinosaur that lived in the Late-Cretaceous Period about 68 to 65.5 million years ago.
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