A pika (a small mammal)-expelling ritual (IMAGE) Xi'an Jiaotong-Liverpool University Caption A pika (a small mammal)-expelling ritual at a grassland restoration site on the Qinghai-Tibetan Plateau in the northwest of China. Credit Li Li Usage Restrictions Credit author 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.