The T-Rex is a giant, carnivorous dinosaur that lived during the late Cretaceous period, approximately 65 million years ago. Its name means "tyrant lizard king", and it was one of the largest and most powerful land predators of its time. Although its exact size is unknown, estimates suggest that it could reach lengths of over 12 meters (40 feet) and weigh up to 8 metric tons (9 short tons). The T-Rex was characterized by its large head, short arms, and massive body. It had a very powerful bite, and its teeth were well-suited for crushing bone. The T-Rex was a top predator, and its main prey were large dinosaurs like the hadrosaur and the ceratopsian.