Cretaceous Bird Track (IMAGE) Emory Health Sciences Caption A drag mark made by the rear toe on one of the Cretaceous bird tracks indicates that it was a flight landing track. Credit Photo by Anthony Martin Usage Restrictions Must include photo credit License Licensed 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.