Figure 1. (IMAGE) Queen Mary University of London Caption Experimental procedures involved training a tortoise to approach a sound source for a food reward, followed by a test where the tortoise had to choose between two flapping doors with different sized discs based on high or low-pitch sounds. Credit M. Loconsole et. al./Biology letters Usage Restrictions None 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.