Wasp Stalks Aphids (IMAGE) University of Arizona Caption A parasitoid wasp, Aphidius ervi, stalks pea aphids so she can lay eggs in them. The wasp is a tad bigger than 0.01 inches long. Credit © 2005 Kerry M. Oliver Usage Restrictions This photo may only be used to illustrate a story about the research described in this news release. Please make sure to credit the photo as requested. Do not post this photo independent of the story. 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.