Full Name:Tyrannosaurus Rex (meaning "Tyrant Lizard King") T-Rex lived in North America 68 to 65 million years ago, at the end of the Late Cretaceous Period. With a length of around 13 meters it was an intimidating predator, preying upon Hadrosaurs and Ceratopsians, although some experts have suggested it was primarily a scavenger. Over 30 specimens of T-Rex have been identified, with some nearly complete skeletons. Approximated to live roughly 30 years, T-Rex was rumored to have very slow lateral movement, although it was well capable of running 25mph (40kmh).