rex was found in 1900 by Barnum Brown, the assistant curator of the American Museum of Natural History. The first partial skeleton confirmed to be T. Hatcher realized in 1907 that they actually were theropod remains. However, he initially thought they belonged to a ceratopsid dinosaur, which he named Manospondylus gigas.
Paleontologist John Bell Hatcher discovered some postcranial remains during the 1890s, and in 1892, Edward Drinker Cope of Bone Wars fame found vertebrae belonging to it. The earliest finds now attributed to Tyrannosaurus were isolated teeth found by geologist Arthur Lakes near Golden, Colorado in 1874.
Evidence of predation include part of the caudal vertebrae (tail bones) of an Edmontosaurus being bitten off and healed, as well as Triceratops horns being broken off and healed. It mainly hunted ceratopsians and hadrosaurs. rex was the apex predator of its environment.
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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