Giant panda "Shun Shun" eats at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, June 1, 2020. Hainan Tropical Wildlife Park and Botanical Garden on Monday prepared special food and toys for giant pandas "Gong Gong" and "Shun Shun" during an event to celebrate the International Children's Day. (Xinhua/Yang Guanyu)

Giant panda "Gong Gong" eats at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, June 1, 2020. Hainan Tropical Wildlife Park and Botanical Garden on Monday prepared special food and toys for giant pandas "Gong Gong" and "Shun Shun" during an event to celebrate the International Children's Day. (Xinhua/Yang Guanyu)

Giant panda "Shun Shun" eats in a pool at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, June 1, 2020. Hainan Tropical Wildlife Park and Botanical Garden on Monday prepared special food and toys for giant pandas "Gong Gong" and "Shun Shun" during an event to celebrate the International Children's Day. (Xinhua/Yang Guanyu)

Giant panda "Gong Gong" eats at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, June 1, 2020. Hainan Tropical Wildlife Park and Botanical Garden on Monday prepared special food and toys for giant pandas "Gong Gong" and "Shun Shun" during an event to celebrate the International Children's Day. (Xinhua/Yang Guanyu)

Giant panda "Gong Gong" rests in a pool at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, June 1, 2020. Hainan Tropical Wildlife Park and Botanical Garden on Monday prepared special food and toys for giant pandas "Gong Gong" and "Shun Shun" during an event to celebrate the International Children's Day. (Xinhua/Yang Guanyu)

Giant panda "Gong Gong" plays with a toy at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, June 1, 2020. Hainan Tropical Wildlife Park and Botanical Garden on Monday prepared special food and toys for giant pandas "Gong Gong" and "Shun Shun" during an event to celebrate the International Children's Day. (Xinhua/Yang Guanyu)

Visitors take photos of giant panda "Shun Shun" at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, June 1, 2020. Hainan Tropical Wildlife Park and Botanical Garden on Monday prepared special food and toys for giant pandas "Gong Gong" and "Shun Shun" during an event to celebrate the International Children's Day. (Xinhua/Yang Guanyu)

Giant panda "Shun Shun" rests at Hainan Tropical Wildlife Park and Botanical Garden in Haikou, south China's Hainan Province, June 1, 2020. Hainan Tropical Wildlife Park and Botanical Garden on Monday prepared special food and toys for giant pandas "Gong Gong" and "Shun Shun" during an event to celebrate the International Children's Day. (Xinhua/Yang Guanyu)