Drosophila 02 (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Three male flies of different body sizes are undergoing special body-size training. A computer screen in the background artificially reduces the parallax motion and, as a result, the flies learn that their body size is smaller than it actually is. Credit photo/©: T. Hermanns, H.H. Huber, AG Strauss, JGU Usage Restrictions This image may only be used in connection with the press release "Memory research: Fruit flies learn their body size once for an entire lifetime", issued by Johannes Gutenberg University Mainz on August 21, 2019. 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.