ROGER HARRIS / SCIENCE PHOTO LIBRARY ROGER HARRIS / SCIENCE PHOTO LIBRARY
Tyrannosaurs mating. Computer illustration of two tyrannosaurid dinosaurs mating in a prehistoric landscape. Tyrannosaurs were bipedal carnivorous theropods that lived from the Jurassic Period (around 200 to 145 million years ago) to the end of the Cretaceous Period (around 145 to 66 million years ago), in what is now North America, Europe, Asia, South America and Australia.
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