Tyrannosaurus rex lived around 68 to 66 million years ago during the Late Cretaceous period and was one of the largest land predators ever. It could grow up to 12 meters (40 feet) long and weigh about 9 tons. T. rex had massive jaws filled with teeth up to 15 cm (6 inches) long and could bite with over 6 tons of force—strong enough to crush bone. Its short but powerful arms had two fingers, and its strong legs helped it move quickly for its size. Credits Walking with Dinosaurs Follow to see the