Albertosaurus was a pretty advanced tyrannosaur despite its smaller stature. It possessed the general tyrannosaur form and is thought to have run at speeds 8 and 13 miles per hour thanks solidly built leg and foot with long third digit (middle toe) on its feet and average sized second and fourth digits (first and third toes) with toe number one being held behind the foot and not in contact with the ground. Another interesting bit of Albertosaurus anatomy is an ampulla (a round hole) built into its teeth that helped to prevent them from cracking when great tearing forces were exerted on the thin serrated fronts of the teeth. This design is even used in airplanes to help prevent important parts of the planes from cracking while under duress during flight. One mystery we will have to visit is the relationship to Gorgosaurus libratus, an animal that many think is the second Albertosaurus species incorrectly named (Phil Currie is an important opponent of this idea and many side with his research on the matter).