Bird Biomechanics (image) American Physical Society Share Print E-Mail 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. Physical Review Letters (2020) Usage Restrictions None Share Print E-Mail 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.