Giant pandas eat bamboo leaves at the Chengdu Research Base of Giant Panda Breeding in Chengdu, capital of southwest China's Sichuan Province, Jan. 1, 2020. Many tourists came to see the giant pandas during the New Year holiday. Photo:Xinhua

Giant pandas eat bamboo leaves at the Chengdu Research Base of Giant Panda Breeding in Chengdu, capital of southwest China's Sichuan Province, Jan. 1, 2020. Many tourists came to see the giant pandas during the New Year holiday. Photo:Xinhua

Giant pandas eat bamboo leaves at the Chengdu Research Base of Giant Panda Breeding in Chengdu, capital of southwest China's Sichuan Province, Jan. 1, 2020. Many tourists came to see the giant pandas during the New Year holiday. Photo:Xinhua

A giant panda is seen at the Chengdu Research Base of Giant Panda Breeding in Chengdu, capital of southwest China's Sichuan Province, Jan. 1, 2020. Many tourists came to see the giant pandas during the New Year holiday. Photo:Xinhua

Giant pandas eat bamboo leaves at the Chengdu Research Base of Giant Panda Breeding in Chengdu, capital of southwest China's Sichuan Province, Jan. 1, 2020. Many tourists came to see the giant pandas during the New Year holiday. Photo:Xinhua

A giant panda is seen at the Chengdu Research Base of Giant Panda Breeding in Chengdu, capital of southwest China's Sichuan Province, Jan. 1, 2020. Many tourists came to see the giant pandas during the New Year holiday. Photo:Xinhua

Giant pandas eat bamboo leaves at the Chengdu Research Base of Giant Panda Breeding in Chengdu, capital of southwest China's Sichuan Province, Jan. 1, 2020. Many tourists came to see the giant pandas during the New Year holiday. Photo:Xinhua

Giant pandas eat bamboo leaves at the Chengdu Research Base of Giant Panda Breeding in Chengdu, capital of southwest China's Sichuan Province, Jan. 1, 2020. Many tourists came to see the giant pandas during the New Year holiday. Photo:Xinhua