Funding for this research was provided by:
National Natural Science Foundation of China (NSFC, 31971413)
Natural Science Foundation of Hebei Province (C2020205038, NSFHB)
Second Tibetan Plateau Scientific Expedition and Research Program (2019QZKK0501, STEP)
Received: 19 April 2021
Accepted: 1 September 2021
First Online: 9 September 2021
: The present study complies with the current laws of China. Fieldwork was carried out under permission from the Department of Wildlife Conservation (Forestry Bureau) of Hebei Province and Qinghai Province. Experimental procedures were permitted by the approval of the Institutional Animal Care and Use Committee (HEBTU2013-7) and the Ethics and Animal Welfare Committee (No. 2013-6) of Hebei Normal University, China.
: Not applicable.
: The authors declare that they have no competing interests.