1 College of Life Sciences, Northwest University, Xi'an, 710069, China. Shaanxi Key Laboratory for Animal Conservation, Shaanxi Institute of Zoology, Shaanxi Academy of Sciences, Xi'an, 710032, China.
2 Department of Psychology, Kyoto University Graduate School of Letters, Kyoto, 606-8501, Japan.
3 Martin Hall, School of Sociology and Anthropology, Sun Yat-Sen University, Guangzhou, 510275, China.
4 Shaanxi Key Laboratory for Animal Conservation, Shaanxi Institute of Zoology, Shaanxi Academy of Sciences, Xi'an, 710032, China. baoguoli@nwu.edu.cn.