Alex Clark with fossil (IMAGE) Field Museum Caption Alex Clark, a PhD student at the Field Museum and the University of Chicago, examining the fossil he helped describe, Imparavis attenboroughi. Credit Courtesy of Alex Clark Usage Restrictions Please include credit License Original content 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.