A giant panda plays on a tree at the Research and Conservation Center for Giant Panda in the Wolong Nature Reserve in southwest China's Sichuan Province, October 30, 2019. (Photo/China News Service)

Giant pandas play on a tree at the Research and Conservation Center for Giant Panda in the Wolong Nature Reserve in southwest China's Sichuan Province, October 30, 2019. (Photo/China News Service)

Giant pandas play on a tree at the Research and Conservation Center for Giant Panda in the Wolong Nature Reserve in southwest China's Sichuan Province, October 30, 2019. (Photo/China News Service)

Giant pandas play on a tree at the Research and Conservation Center for Giant Panda in the Wolong Nature Reserve in southwest China's Sichuan Province, October 30, 2019. (Photo/China News Service)