Hoverfly Quickly Falters without Halteres (VIDEO) Case Western Reserve University This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption All flies need halteres for stability and to maneuver during flight. Credit Jessica Fox Usage Restrictions please give proper 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.