Albertosaurus was a relative of Tyrannosaurus. Although they both are of the same species, Albertosaurus was smaller than the Tyrannosaurus. Albertosaurus lived a few million years earlier than Tyrannosaurus. Albertosaurus was a bipedal dinosaur. It had two-fingered hands,(as most of the carnivores have) on short arms. It had powerful back legs with clawed, three-toed feet. Albertosaurus was about 30 feet (9 m) long, about 11 feet (3.4 m) tall at the hips, and up to 3 tons in weight (2500 kg). 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 but had at least one replacement tooth growing up from under each tooth. Albertosaurus lived in the late Cretaceous period, about 76-74 million years ago, toward the end of the Mesozoic era. Albertosaurus was a carnivore (a meat eater). It probably ate plant-eating dinosaurs, mainly consisting of hadrosaurs, such as Lambeosaurus and Corythosaurus. Albertosaurus walked on two muscular legs, which makes this carnivore a bipedal carnivore. Albertosaurus had a very strong bite force, as many of the Tyrannosaurids have, even stronger than Giganotosaurus.