Species:Tyrannosaurus rex Pronunciation: Tie-ran-oh-sore-us rex Meaning: "Tyrant lizard king" What: Tyrannosaurid dinosaur Where: Canada (Alberta and Saskatchewan) and United States (Colorado, Montana, North Dakota, South Dakota, Texas, Utah, and Wyoming) When: ~ 68,000,000 B.C.E. to 65,500,000 B.C.E. Size: 12 to 13 meters (40 to 43 feet) long Diet: Carnivore Reconstruction: Tyrannosaurus rex Fun Fact: Contrary to what a certain movie may have told you, T. rex had amazing vision, and yes, he could see you if you were standing still.