Jeholornis, Prehistoric Bird of the Cretaceous (image) University of Chicago Share Print E-Mail 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. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.