Triceratops, with its three horns and bony frill around the back of its head, is one of the most recognizable dinosaurs. Its name is a combination of the Greek syllables tri-, meaning "three," kéras, meaning "horn," and ops, meaning "face." The dinosaur roamed North America about 67 million to 65 million years ago, during the end of the Cretaceous Period. It plodded around on all fours and was a herbivore. It probably used its formidable arsenal for defense rather than hunting live prey. Triceratops could reach up to 9 m (30 feet) in length and 3 m (10 feet) in height.