Big Brown Bat in Flight (IMAGE) University of Maryland Caption University of Maryland researchers have learned that male big brown bats in flight use a special call, different from the echolocation calls they use for navigation, to warn other foraging males away from insect prey that they are claiming for themselves. Credit Jessica Nelson, Auditory Neuroethology Laboratory, University of Maryland 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.