|Scientific name :||Triceratops horridus|
|Time period :||Late Cretaceous|
|Primary diet :||Herbivore|
|In the documentary|
A herd mixed with Triceratops, Edmontosaurus, and Ornithomimus are seen grazing in the fern plain. A young male T. rex charges out of the forest in an ambush, prompting the Triceratops herd to assume a defensive position by surrounding the baby Triceratops in an impenetrable circular position. The Tyrannosaurus backs off in response and decides to instead chase a Quetzalcoatlus who was feeding on a dead Triceratops, but the pterosaur escapes, and so the tyrant prince retreats back into the forest. Later, multiple Triceratops were seen running from the meteor shower that the asteroid impact unleashed upon their world, and are shown to have gone extinct alongside all other dinosaurs, with the exception of birds.
- Triceratops may have had feather-like quills on its back, something the When Dinosaurs Roamed America Triceratops doesn’t have. It should be noted however that this theory was proposed long after the documentary’s debut, and it is only a theory in any case.
- Triceratops may have possessed a keratin covering over its skull in life, which could potentially have caused the horns to appear even larger and differently shaped than the animal is generally depicted.