Floppy Skin with Muscle Power (VIDEO) Brown University 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 As bats fly the air pushes their compliant skin around. A new study provides evidence that they control wing stiffness and shape using muscles embedded in their skin. Credit Swartz & Breuer labs / Brown University Usage Restrictions With credit. 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.