Losing Feathers Negatively Affects Flight (IMAGE) Society for Experimental Biology Caption The researchers used a trained jackdaw in a wind tunnel to study flight. Credit Aron Hejdström Usage Restrictions None 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.