The Albertosaurus is a species of tyrannosaurid dinosaur that can grow up to an average length of 9 meters, so was smaller than other tyrannosaurids such as the Tarbosaurus and the Tyrannosaurus. They travel in packs of 22 Albertosauruses to find and eat smaller dinosaurs. Very large openings in their skulls make their head lighter, and their jaws posess 60 teeth. Other dinosaurs of this family posess fewer teeth. The name "Albertosaurus" means "Alberta lizard," and was named after Alberta, which is the place where its first remains were found.