Giant panda "Shunshun" enjoys a mooncake at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

Giant panda "Shunshun" enjoys a mooncake at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

Giant panda "Gonggong" enjoys a mooncake at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

Giant panda "Gonggong" enjoys a mooncake at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

Photo taken on Sept. 12, 2019 shows mooncakes made for giant pandas at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

Staff members make mooncakes for giant pandas at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

A staff member displays mooncakes made for giant pandas at the Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

Giant panda "Shunshun" eats a mooncake at the Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

Giant panda "Gonggong" eats a mooncake at the Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

Tourists take pictures of giant panda "Gonggong" at the Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

A tourist poses for a photo with giant panda "Gonggong" at the Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

A tourist takes a picture of giant panda "Gonggong" eating a mooncake at the Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

Staff members make mooncakes for giant pandas at the Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)

A staff member prepares a mooncake dish for giant pandas at the Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, Sept. 12, 2019. The moon cakes were specially made by the staff of Hainan Tropical Wildlife Park and Botanical Garden for giant pandas "Gonggong" and "Shunshun" to greet the upcoming Mid-Autumn Festival, which falls on Sept. 13 this year. (Xinhua/Yang Guanyu)