Albertosaurus arm and hand-cast replica reproduction.

Albertosaurus arm and hand cast replica reproduction.

Albertosaurus, the dinosaur of Cretaceous Alberta, Canada.

Royal Ontario Museum skeleton specimen.

Measures: Arm length. 42in/1.1 m

Albertosaurus was a large, meat-eating dinosaur from the Late Cretaceous period. 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.

Albertosaurus (/ælˌbɜːrtəˈsɔːrəs/; meaning "Alberta lizard") is a genus of tyrannosaurid theropod dinosaurs that lived in western North America during the Late Cretaceous Period. The type species, A. sarcophagus, was apparently restricted in range to the modern-day Canadian province of Alberta, after which the genus is named. Scientists disagree on the content of the genus, with some recognizing Gorgosaurus libratus as a second species.

As a tyrannosaurid, Albertosaurus was a bipedal predator with tiny, two-fingered hands and a massive head that had dozens of large, sharp teeth. It may have been at the top of the food chain in its local ecosystem. While Albertosaurus was large for a theropod, it was much smaller than its larger and more famous relative Tyrannosaurus rex, growing nine to ten meters long and possibly weighing less than 2 metric tons.

Since the first discovery in 1884, fossils of more than 30 individuals have been recovered, providing scientists with a more detailed knowledge of Albertosaurus anatomy than is available for most other tyrannosaurids. The discovery of 26 individuals at one site provides evidence of pack behavior and allows studies of ontogeny and population biology, which are impossible with lesser-known dinosaurs.

Kingdom: Animalia

Phylum: Chordata

Clade: Dinosauria

Clade: Saurischia

Clade: Theropoda

Family: †Tyrannosauridae

Subfamily: †Albertosaurinae

Genus: †Albertosaurus

Theropods Theropoda

Rental

Dinosauria

Dinosaur Skull

Dinosaur

Albertosaurus

Gorgosaurus and Albertosaurus are extremely similar, distinguished mainly by subtle differences in the teeth and skull bones. Some experts consider G. libratus to be a species of Albertosaurus; this would make Gorgosaurus a junior synonym of that genus.

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