Ruffed grouse foot (IMAGE) Penn State Caption Male ruffed grouse grow modified scales on their feet which may help to increase surface area during the winter months. Credit Julian Avery, Penn State Usage Restrictions Educational use only License Original 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.