A Pika Sits among Rocks and Moss (IMAGE) U.S. National Science Foundation Caption A pika sits among rocks and moss; on high peaks, pikas are threatened by global warming. Credit Jo Varner Usage Restrictions None 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.