Albertosaurus is a Tyrannosaurus type dinosaur. It is smaller than its southern counter part. Like T Rex they have small but powerful arms with two fingers. A large head and a long tail. Albertosaurus lived in pairs and hunt in packs or gangs. They are the first dinosaur found in Alberta, Canada. At the time in the region they where Canada's top predator. They went extinct due to the arrival of Tyrannosaurus rex.