Fly Larvae in a Gall (IMAGE) University of Zurich Caption The biologists collected about 600 galls and checked if the fly larvae had survived. Credit Matthew Barbour / UZH Usage Restrictions With credits 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.