Giant panda Gong Gong feeds on bamboo at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Aug. 18, 2019. Giant pandas Gong Gong and Shun Shun celebrated their sixth birthday here on Sunday. They moved to Haikou on Nov. 10, 2018 from the China Conservation and Research Center for Giant Pandas in Sichuan. (Xinhua/Guo Cheng)