Caddisfly larvae (IMAGE) University of York Caption For the study, the researchers presented larvae with pieces of plastic film cut from a commercially available biodegradable plastic bag, alongside pieces of oak leaf. Credit Katey Valentine, University of York Usage Restrictions For editorial use License Original 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.