I'm pretty sure you guys all know about the Tyrannosaurus Rex. Here are facts about it. It's name means "tyrant lizard king." There are about 20 skeletons that are about 90 percent complete. It can grow up to be 12 meters (40 feet) long. It weighed up to 5 tons. Rexes bites were so powerful it could eat a 10th grader in one bite. Its tail wasn't used for just decoration, It was used to balance its massive head. Rex had a brain twice the size of other carnivores. It was faster, and it had better vision. It lived 65 million years ago in the late Cretaceous. In 1990, a complete Rex was found and sold for 8.36 million dollars! If T-Rex was around today, it would dent the metal on a car. It could rip hundreds of pounds of meat in just one bite. It's teeth were 5 inches long! If it were to trip and fall, it would probably die because it's so big and has tiny arms so it wouldn't be able to catch itself.