Male Big Brown Bat's Call (video) University of Maryland Loading video... Caption In this animated graphic of bats' calls in flight, two bats are represented by different colors, red and blue. The bats' movements and vocalizations have been slowed by a factor of 10. The top graph in the movie traces the bats' movements around a flight room where the study took place. Each circle on the bats' paths indicates a vocalization. The frequency-modulated bout vocalizations are in green. The prey is a tethered mealworm in the center of the room, represented by a yellow circle. The bottom bars show characteristics of the bats' calls -- from top to bottom: pulse interval (the amount of time between calls), duration, and frequency. Again, the frequency-modulated bout calls are in green. Credit Genevieve S. Wright, University of Maryland Usage Restrictions None 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.