Tyrannosauridae

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Tyrannosauridae (or tyrannosaurids, meaning "tyrant lizards") is a family of coelurosaurian dinosaurs that comprises two subfamilies containing up to fifteen genera, including the eponymous Tyrannosaurus. The exact number of genera is controversial, with some experts recognizing as few as three. All of these animals lived near the end of the Cretaceous period and their fossils have been found only in North America and Asia. Well-known genera include Tyrannosaurus, Albertosaurus, Gorgosaurus, Daspletosaurus, Tarbosaurus, and Dynamoterror. Although descended from smaller ancestors, tyrannosaurids were almost always the largest predators in their respective ecosystems, putting them at the apex of the food chain. The largest species was Tyrannosaurus rex, one of the most massive known terrestrial predators of all time, which measured over 13 metres (43 ft) in length and according to most modern estimates up to 8.87 metric tons (9.78 short tons) in weight. Tyrannosaurids were bipedal carnivores...

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