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Biography

Daspletosaurus (/dæsˌpliːtəˈsɔːrəs/ das-PLEET-o-SAWR-əs; meaning "frightful lizard") is a genus of tyrannosaurid dinosaur that lived in western North America between about 79.5 and 74 million years ago, during the Late Cretaceous Period. The genus Daspletosaurus contains two species. Fossils of the earlier type species, D. torosus, have been found in Alberta, while fossils of the later second species, D. horneri, have been found only in Montana. A possible third species, also from Alberta, awaits formal identification and another possible species D. degrootorum, also exists, but it may belong to the separate genus Thanatotheristes instead. Daspletosaurus is closely related to the much larger and more recent tyrannosaurid Tyrannosaurus rex. Like most tyrannosaurids, Daspletosaurus was a multi-tonne bipedal predator equipped with dozens of large, sharp teeth. Daspletosaurus had the small forelimbs typical of tyrannosaurids, although they were proportionately longer than in other genera. As an apex predator, Daspletosaurus was at the top of the food chain, probably preying on large dinosaurs like the ceratopsid Centrosaurus and the hadrosaur Hypacrosaurus. In some areas, Daspletosaurus coexisted with another tyrannosaurid, Gorgosaurus, though there is some evidence of niche differentiation between the two. While Daspletosaurus fossils are rarer than other tyrannosaurid fossils, the available specimens allow some analysis of the biology of these animals, including social behavior, diet and life history.