Tethered Fruit Fly (IMAGE) Howard Hughes Medical Institute Caption Experiments with flies tethered to thin metal rods helped researchers see how nerve cells in the doughnut-shaped ellipsoid body interact to create a reliable compass. Credit Courtesy of Igor Siwanowicz Usage Restrictions Must use credit 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.