Firefly (IMAGE) Tel-Aviv University Caption New study reveals: fireflies produce strong ultrasonic sounds that might deter bats, potentially serving as a kind of 'musical armor' against these predators. Credit BRANDON ALMS 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.