1. Shaanxi Key Laboratory for Animal Conservation, Shaanxi Institute of Zoology , Xi’an 710032 , China
2. Shaanxi Key Laboratory for Animal Conservation, College of Life Sciences, Northwest University , Xi’an 710069 , China
3. Bio-Agriculture Institute of Shaanxi , Xi’an 710043 , China
4. Department of Psychology, Kyoto University Graduate School of Letters , Kyoto 606-8501 , Japan
5. Research Center of Qinling Giant Panda, Shaanxi Academy of Forestry , Xi’an 710402 , China
6. Department of Management and Marketing, School of Business and Economics, Universiti Putra Malaysia, Serdang , Selangor 43400UPM , Malaysia