![]() Its long and powerful back legs suggest it was a fast runner across short distances and its tiny arms were surprisingly powerful for their size. It would have hunted a wide variety of other dinosaurs, including hadrosaurs, as evidenced by bones showing healed wounds from a tyrannosaur attack. Tyrannosaurus rex lived during the Cretaceous period across what is now western North America. Despite its large size, Tyrannosaurus rex is more closely related to smaller theropods like Velociraptor than to comparable-sized dinosaurs like Allosaurus. Tyrannosaurus rex and other close relatives featured extremely powerful jaws capable of crushing bone and extremely acute senses of sight and smell, making them effective predators. One of the largest specimens, nicknamed "Sue", was 12.8m (42ft) long and may have weighed up to 14 tonnes. Perhaps the most famous dinosaur of all time, Tyrannosaurus rex was one of the largest theropods, a group of largely carnivorous dinosaurs.
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