Caching (IMAGE) University of Vienna Caption Ravens hid their food only well when dominant conspecifics were visible and audible at the same time. Credit Copyright: Jana Müller, Universität Wien Usage Restrictions The image may only be used with appropriate caption or 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.