Bird Biomechanics (IMAGE) American Physical Society Caption An analysis of a bird species' unique rasps shows how sound fluctuations in birds' songs might reveal details about birds' body sizes. Credit Uribarri et al. <em>Physical Review Letters</em> (2020) 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.