The Albertosaurus is a tyrannosaurid from the late cretaceous period (the period just before the mass extinction of the dinosaurs). The Albertosaurus looks similar to a Tyrannosaurus Rex, though much smaller. It’s name is literally from the province in which it was discovered. A co-worker of mine happens to own a fossilized Albertosaurus tooth, as you see me holding below. That tooth (now rock) is over 65 million years old!