The T-Rex is probably the most known dinosaur in history. Almost everyone knows about it, and if you think you know him, I will tell you more! The T-Rex was thought to be the biggest meat eating dinosaur, until the Giganotosaurus was found, but I will tell you more about that later! The T-Rex was a huge meat-eating dinosaur that lived during the late Cretaceous Period, about 85 million to 65 million years ago. He lived in a humid, semi-tropical environment, in open forests with nearby rivers and in coastal forested swamps. T-Rex was up to 40 feet long, about 15 to 20 feet (4.6 to 6 m) tall. The arms were only about 3 feet long. T-Rex was roughly 5 to 7 tons in weight. One T-Rex's jaws were up to 4 feet long and had 50 to 60 thick, conical, bone-crunching teeth that ranged in size from very small to over 9 inches long. Adult had a variety of sizes of teeth in their jaws at one time, as teeth were broken and new ones grew in to replace them. One T-Rex was found with some teeth up to 13 inches long! The amazing T-Rex could eat up to 500 pounds of meat and bones in one bite! T-Rex is a huge an interesting dinosaur, but he isn't the only one. The next dinosaur is the Velociraptor. Read on to find out about that dinosaur, which was also a carnivore.