This specimen is a cast of a tooth from a Tyrannosaurus rex (T. rex), which is now extinct. This theropod, or two-legged dinosaur, is a well-known carnivore with sharp, cone-shaped teeth like this one to tear into their prey. This entire cast is 4.25 cm thick and measures 20.5 cm x 12 cm. The tooth itself is 17 cm x 6 cm x 4 cm.