Fierce, carnivorous Albertosaurus sarcophagus is almost identical to its cousin Tyrannosaurus rex, but not as large. Like other tyrannosaurs, it walked on two legs and had a large head. It had two-fingered hands on short arms. Its long tail gave it balance and quick turning. It had powerful back legs with clawed, three-toed feet. The lower jaw of Albertosaurus had from 14 and 16 teeth; the upper jaw had 17-19 teeth. It had one row of teeth in each jaw with a replacement layer growing up beneath.