Wild geese, swans arrive at Hongjiannao Wetland Reserve in NW China (4)

Aerial photo taken on Nov. 3, 2021 shows a flock of swans swimming on the lake of the Hongjiannao Wetland Reserve in Shenmu, northwest China's Shaanxi Province. Flocks of wintering wild geese and swans have arrived at the Hongjiannao Wetland Reserve on their route of migration. (Xinhua/Tao Ming)