Pika Haying (image) University of California - Santa Cruz Share Print E-Mail Caption Pikas spend the summer gathering grasses and wildflowers to store in "haypiles" for winter subsistence. When summer temperatures are too high, they are forced to stay underground. Credit Chris Ray Usage Restrictions For use only with news coverage of this research. 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.