Contact: Steve Koppes
University of Chicago
Caption: Jeholornis, an early bird, lived during the early Cretaceous period approximately 120 million years ago. The evolution of Jeholornis and other Cretaceous birds is the subject of a new paper published in the Proceedings of the Royal Society B.
Credit: Allison Elaine Johnson
Usage Restrictions: News organizations may use this image in connection with reports about the research of Jonathan Mitchell and Peter Makovicky.
Related news release: Prehistoric birds lacked in diversity