Tyrannosaurus rex, commonly known as T. rex, is a large carnivorous dinosaur that lived during the Late Cretaceous period. Its name means “tyrant lizard king” in Greek, referring to its dominant position as the largest and most fearsome predator of its time.

T. rex was a theropod, a group of dinosaurs characterized by their large jaws and sharp teeth. It had a massive skull, with powerful jaws that could exert a bite force of up to 12,800 pounds.

The T. rex was also one of the largest land predators, measuring up to 42 feet in length and weighing up to 15-20 tons. It was a bipedal animal, walking on two legs, and probably hunted in packs. T. rex fossils have been found in North America, Asia and Europe.