Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 3, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 3, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 4, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 4, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 4, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 3, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 4, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 3, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 3, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 3, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 3, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 3, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 3, 2019. [Photo/Xinhua]

Qizai, a rare brown and white giant panda, is seen at Qinling Research Base of Giant Panda Breeding of Shaanxi Academy of Forestry in Xi'an, Northwest China's Shaanxi province, Dec 3, 2019. [Photo/Xinhua]