Photo taken on Nov. 2, 2016 shows giant panda Wu Wen in the Wolong National Nature Reserve, southwest China's Sichuan Province. Two giant pandas Xing Ya and Wu Wen, left for the Netherlands on 15-year research mission. (Xinhua/Xue Yubin)

Photo taken on April 10, 2017 shows giant panda Xing Ya in the Wolong National Nature Reserve, southwest China's Sichuan Province. Two giant pandas Xing Ya and Wu Wen, left for the Netherlands on 15-year research mission. (Xinhua/Xue Yubin)