Tyrannosaurus rex dinosaurs. Artwork of two Tyrannosaurus rex dinosaurs feeding on a Parasaurolophus dinosaur. T. rex was a large bipedal (two-legged) reptile that lived during the Upper Maastrichtian stage (67 to 65 million years ago). It was one of the largest carnivorous dinosaurs, measuring 12.4 metres long and up to 6 metres tall.
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