Yak and sheep (IMAGE) Washington University in St. Louis Caption Yak and sheep near Siling Lake, at an elevation of 4,560 meters above sea level. Credit Xinyi Liu Usage Restrictions For editorial purposes 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.