A newly discovered species of dinosaur with a unique winglike formation on the back of its skull has been described in a study. Mercuriceratops gemini was a plant eater that lived about 77 million years ago in the Late Cretaceous Period. "The butterfly-shaped frill, or neck shield, of Mercuriceratops is unlike anything we have seen before," said Royal Ontario Museum curator David Evans, who co-authored the study.

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