Panda Baiyun and Xiao Liwu are seen at Qingchengshan base of the China Conservation and Research Center for the Giant Panda in Southwest China's Sichuan province, Jun 27, 2019. The pandas now adapt to the conditions in China and are in good health after a month-long quarantine. Twenty-seven-year-old female giant panda Bai Yun and her son, six-year-old Xiao Liwu, arrived in Sichuan province in May this year, after the San Diego Zoo's conservation loan agreement with China ended. (Photo: China News Service/ An Yuan)

Panda Baiyun and Xiao Liwu are seen at Qingchengshan base of the China Conservation and Research Center for the Giant Panda in Southwest China's Sichuan province, Jun 27, 2019. The pandas now adapt to the conditions in China and are in good health after a month-long quarantine. Twenty-seven-year-old female giant panda Bai Yun and her son, six-year-old Xiao Liwu, arrived in Sichuan province in May this year, after the San Diego Zoo's conservation loan agreement with China ended. (Photo: China News Service/ An Yuan)

Panda Baiyun and Xiao Liwu are seen at Qingchengshan base of the China Conservation and Research Center for the Giant Panda in Southwest China's Sichuan province, Jun 27, 2019. The pandas now adapt to the conditions in China and are in good health after a month-long quarantine. Twenty-seven-year-old female giant panda Bai Yun and her son, six-year-old Xiao Liwu, arrived in Sichuan province in May this year, after the San Diego Zoo's conservation loan agreement with China ended. (Photo: China News Service/ An Yuan)

Panda Baiyun and Xiao Liwu are seen at Qingchengshan base of the China Conservation and Research Center for the Giant Panda in Southwest China's Sichuan province, Jun 27, 2019. The pandas now adapt to the conditions in China and are in good health after a month-long quarantine. Twenty-seven-year-old female giant panda Bai Yun and her son, six-year-old Xiao Liwu, arrived in Sichuan province in May this year, after the San Diego Zoo's conservation loan agreement with China ended. (Photo: China News Service/ An Yuan)