Acoustic Camera Image (IMAGE) University of California - Riverside Caption An acoustic camera image shows how Costa's hummingbirds dive to the side of a caged female to minimize an audible Doppler sound. The color represents loudness. Credit Christopher Clark, UC Riverside 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.