JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
Confuciusornis prehistoric birds, illustration. Confuciusornis sanctus is an extinct bird that was common in the Cretaceous (146 to 65 million years ago). It was seen by riversides in what would later become Asia. This bird had 'finger claws' on its wings, and used these to climb on the bark of trees. It fed on nuts and seeds with its toothless beak. Males (one at left) had twin tail feathers.
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