Krill (image) Virginia Institute of Marine Science Caption These krill -- recovered from a penguin's stomach through a non-invasive procedure called lavage -- show the importance of these shrimplike crustaceans to the penguin diet. Credit Photo courtesy of Donna Patterson-Fraser. Usage Restrictions One-time use only. 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.