Triceratops

Triceratops was a plant-eating dinosaur that lived during the late Cretaceous Period, 65 million years ago. It was a descendant of Styracosaurus, with horns on its snout and eyes, and a spiked neck frill. Triceratops could open its jaws sideways to gather foliage by rotating the joint between its head and neck. Fossil evidence indicates that the underside of the neck frill contained a dense network of blood vessels that was used to cool the dinosaur in much the same way elephants transport blood to their ears to radiate heat.