Dinosaur

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Tyrannosaurus rex (meaning 'tyrant lizard') is a species of tyrannosaurid theropod dinosaur. Commonly abbreviated to T. rex, it is one of the dinosaurs most often featured in popular culture around the world. It lived in what is now western North America.

Tyrannosaurids were bipedal carnivores with massive skulls balanced by long, heavy tails. Relative to the large and powerful hindlimbs, Tyrannosaurus forelimbs were small and retained only two digits. Although other theropods rivaled or exceeded T. rex in size, it was the largest known tyrannosaurid and one of the largest known land predators, measuring over 12 metres (40 feet) in length and up to 7.5 tons in weight.

Fossils of some T. rex have been found in North American rock formations dating to the very end of the Cretaceous Period (approximately 65 million years ago); it was among the last dinosaurs to exist prior to the Cretaceous-Tertiary extinction event. More than 30 specimens of T. rex have now been identified, some nearly complete, which have allowed significant research into many aspects of the species' biology, including its life history and biomechanics. The feeding habits and potential speed of T. rex remain controversial.

For more details, see the original Wikipedia article.