Beetle-Killed Forest (IMAGE) University of Wyoming Caption Downed trees resulting from a bark beetle epidemic pose a significant obstacle for elk in southern Wyoming's Sierra Madre Mountains. Credit Wyoming Cooperative Fish and Wildlife Research Unit 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.