Tyrannosaurus rex dinosaur head, computer artwork. This dinosaur lived in North America and Asia from about 70 million years ago until the mass extinction of the dinosaurs some 5 million years later. The head is heavily built, probably to allow it to withstand its impact with a prey animal. It has the sharp teeth of a predator, although T. rex is thought to have been a scavenger as well as an active hunter. One of the largest carnivorous dinosaurs, T. rex measured 6 metres in height and weighed up to 7 tonnes.
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