Triceratops: The huge head of this prehistoric beast was adorned with three horns and a clashing beak, and a large bony frill shielded the animal's neck. The horns may have been a defense against predatory dinosaurs, but like the antlers of a deer they may also have been used to battle rivals for mates or territory. 

Genus Name: Triceratops ("three horns face")
Type Species: * T. horridus (Marsh, 1889)
Length: 26-33 feet (8-10 meters)
Weight: 5-9 tons
Time: 72-65 million years ago (Late Cretaceous)
Place: Colorado, Montana, S. Dakota, Wyoming, Alberta, Saskatchewan 
Diet: plant-eater (herbivore)