Panpan, the world's oldest male panda, is seen at the China Conservation and Research Center in Dujiangyan, Southwest China's Sichuan province, on July 15, 2016. The center, established in 2013, now is taking care of eight giant pandas who are over 20 years old. It is the first of its kind in China and has numerous facilities to provide the best care possible. [Photo/Xinhua]