MILLARD H. SHARP / SCIENCE PHOTO LIBRARY MILLARD H. SHARP / SCIENCE PHOTO LIBRARY
Triceratops (triceratops horridus) dinosaur. This was one of the largest of the ceratopsians, and one of the last to evolve before the extinction of the dinosaurs. It roamed the wetlands of Late Cretaceous North America. It had a characteristic neck frill and horns.
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