Jackdaw in Wind Tunnel (IMAGE) Lund University Caption The air vortexes behind the wings has been processed. Work is done Marco Klein Heerenbrink. Credit Photographer 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.