Key Selection 1 (image) University of Vienna Share Print E-Mail Caption The animals had to choose the correct 'key' out of five. Credit Copyright: Bene Croy Usage Restrictions The image may only be used with appropriate caption or credit. 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.