Bighorn sheep in the Sierra Nevada (IMAGE) American Geophysical Union Caption Even as snow becomes less consistent in the Sierra Nevada mountain range, climate change could be making deadly avalanches more common, threatening the recovery of bighorn sheep there. Credit California Department of Fish and Wildlife/Steve Yaeger Usage Restrictions All rights reserved 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.