Parrot Fish in the Maldives (IMAGE) University of Exeter Caption Parrot grind up coral during feeding and, after digesting the edible content, excrete the rest as sand, which can then be used in island building. Credit Chris Perry, University of Exeter 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.