Scientists still debate the purpose of this dinosaur's iconic horns and spiky ... Behind these horns was a head frill made of bone and studded with small spikes called epoccipitals.

Triceratops was one of the most common dinosaurs at the end of the Cretaceous Period. Its most prominent features are on its head: two long brow horns, a nasal horn, and a bony frill. Its frill had no ...