Songbird (VIDEO) Penn State This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption In this short video, associated with other avian research conducted by Paul Bartell, assistant professor of avian biology, a golden warbler exhibits wing-whirring behavior, showing the bird is in a migratory state, similar to behavior shown by white-throated sparrows. Credit Paul Bartell Penn State Usage Restrictions non commercial use only 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.