Illustration showing a pair of Tyrannosaurus rex in a forest. Tyrannosaurus was one of the largest known land predators, measuring up to 13 metres (43 ft) in length, up to 4 meters (13 ft) tall at the hips, and up to 6.8 metric tons (7.5 short tons) in weight. It lived throughout what is now western North America. Fossils of T. rex date to the last three million years of the Cretaceous Period, approximately 68 to 65 million years ago.
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