Tyrannosaurus rex | Description, Dinosaur, & Facts | Britannica
Tyrannosaurus rex, (Tyrannosaurus rex), species of predatory dinosaurs that lived during the end of the Cretaceous Period (about 66 million years ago) known from fossils found in the United States and Canada dating to between about 80 million and 66 million years ago. Tyrannosaurus rex is the best-known and largest member of a group …
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