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Tyrannosaurus means "tyrant lizard." This dinosaur probably traveled alone or in pairs to hunt and eat other dinosaurs. Its 6-inch high steak-knife teeth were its main weapon, while its powerful forearms served as grappling hooks. There are several species of Tyrannosaurus are known, but Tyrannosaurus rex is the most famous.

Length: 39 feet
Weight: 6.5 tons
Time: 75 - 65 million years ago
Where Found: Western Canada, western U.S. and Southwest Texas.

Think About It: Tyrannosaurus had a huge, 4-foot long head and walked on two legs. Why would it be helpful for this dinosaur to have a big, heavy tail?