Bird Fossil (image) Yale University Share Print E-Mail Caption Bird fossil from the Oligocene epoch, approximately 30 million years old. Credit M.Marsland/Yale Usage Restrictions May be used with acknowledgment given. 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.