Triceratops was a large herbivorous dinosaur that lived during the late Cretaceous period, around 65-72 million years ago. It had two main horns above its eyes and a smaller horn on its snout. Triceratops could grow up to 26 feet long and weigh between 6-12 tons. It lived in herds in marshy, forested areas of western North America and used its horns and bony frill for defense, dominance displays, and courtship rituals. Triceratops had complex teeth that allowed it to eat leaves, stems, and branches, with up to 800 teeth at once that were continuously replaced as they wore down from chewing.