The holotype of Tyrannosaurus rex was discovered in Montana in 1902. The partial skull and skeleton took 3 years to excavate. The jaw alone of these large dinosaurs was 4 feet long with teeth measuring up to 12 inches. Its name derives from the Greek words for "tyrant" and "lizard" and the Latin word for "king." Depicted these stud earrings is the skull of the tyrant lizard king, one of the most ferocious predators to ever walk the earth.