Albertosaurus was a large, meat-eating dinosaur from the late Cretaceous period about 68 to 65 million years ago. It was a theropod related to T. rex but smaller in size. Albertosaurus was about 8.6 m long and weighed about 2500 kg. This replica is cast from a specimen found in Alberta, Canada. The original fossil is in the Royal Ontario Museum.
As a tyrannosaurid,Albertosauruswas abipedalpredatorwith tiny, two-fingered hands and a massive head that had dozens of large, sharp teeth. It may have been at the top of thefood chainin its localecosystem. WhileAlbertosauruswas large for a theropod, it was much smaller than its larger and more famous relativeTyrannosaurus rex, growing nine to ten meters long and possibly weighing less than 2 metric tons.
Since the first discovery in 1884,fossilsof more than 30 individuals have been recovered, providing scientists with a more detailed knowledge ofAlbertosaurusanatomy than is available for most other tyrannosaurids. The discovery of 26 individuals at one site provides evidence ofpackbehaviour and allows studies ofontogenyandpopulation biology, which are impossible with lesser-known dinosaurs.