Male Bluebird (IMAGE) University of Exeter Caption This image shows a male bluebird. The innovative study, led by an expert from the University of Exeter, looked at how bluebirds altered their songs in response to increases in nearby background noise caused, in many cases, by human activities such as traffic. Credit Dr Caitlin Kight Usage Restrictions please credit Dr Caitlin Kight 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.