The name Triceratops means “three-horned face,” and in real life it was anything but small. This massive four-legged herbivore could grow up to around 8–9 meters long and weigh several tons. It lived in western North America at the very end of the Late Cretaceous, about 68–66 million years ago, making it one of the last non-avian dinosaurs before the mass extinction. One of its most distinctive features was its enormous skull, among the largest known for any land vertebrate, equipped with three impressive horns and a solid bony frill. Those features may have helped with defense, display, or both. Triceratops was also a highly successful and widespread ceratopsian, and it likely moved in herds.