Aerial photo taken on Sept. 8, 2022 shows a scenery of the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province. (Xinhua/Zhang Tao)

Aerial photo taken on Sept. 8, 2022 shows a scenery of the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province. (Xinhua/Zhang Tao)

A waterbird swims in the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province, on Sept. 9, 2022. (Xinhua/Wang Jianwei)

Waterbirds are seen in the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province, on Sept. 9, 2022. (Xinhua/Wang Jianwei)

Aerial photo taken on Sept. 8, 2022 shows a scenery of the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province. (Xinhua/Wang Jianwei)

Waterbirds are seen in the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province, on Sept. 8, 2022. (Xinhua/Wang Jianwei)

A waterbird wades in the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province, on Sept. 1, 2022. (Xinhua/Zhang Tao)

Aerial photo taken on Sept. 8, 2022 shows a scenery of the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province. (Xinhua/Zhang Tao)

Waterbirds forage in the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province, on Sept. 9, 2022. (Xinhua/Wang Jianwei)

A waterbird flies in the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province, on Sept. 1, 2022. (Xinhua/Wang Jianwei)

Aerial photo taken on Sept. 8, 2022 shows a scenery of the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province. (Xinhua/Wang Jianwei)

Waterbirds are seen in the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province, on Sept. 9, 2022. (Xinhua/Zhang Tao)

A waterbird flies in the Fujin National Wetland Park in Fujin City of northeast China's Heilongjiang Province, on Sept. 1, 2022. (Xinhua/Zhang Tao)