Bird's Playlist Could Signal Mental Strengths and Weaknesses (image) Duke University Share Print E-Mail Caption Male song sparrows may reveal mental strengths and weaknesses when they sing. Credit Robert Lachlan, Duke Usage Restrictions Please give proper credit. 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.