MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Tyrannosaurus rex. Computer enhanced image of the upper part of a fossilised Tyrannosaurus rex dinosaur skeleton. Tyrannosaurus (tyrant reptile) was a large carnivore, being about 14 metres (m) long, 5m tall and weighing about 7 tonnes. Its sharp, doubly-serrated teeth were up to 15 centi- metres long. Its skull had a thick, bony framework to help it resist damage from struggling prey. Tyrannosaurus rex's front legs were tiny in comparison to its body and it walked on its two hind legs. It first appeared about 70 million years ago before becoming extinct at the end of the Cretaceous period (65 million years ago) along with the other dinosaurs.
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