Experimental Situation (IMAGE) University of Würzburg Caption The research team used a 3D Helmholtz coil system to manipulate the earth's magnetic field around the nest entrance. Credit Robin Grob Usage Restrictions None 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.