Flocks of snow geese fly over a field near Fraser River in Richmond, British Columbia, Canada, Oct. 29, 2021. (Photo by Liang Sen/Xinhua) 

Flocks of snow geese fly in the sky near Fraser River in Richmond, British Columbia, Canada, Oct. 29, 2021. (Photo by Liang Sen/Xinhua)

Flocks of snow geese fly over a field near Fraser River in Richmond, British Columbia, Canada, Oct. 29, 2021. (Photo by Liang Sen/Xinhua)

Flocks of snow geese fly over a field near Fraser River in Richmond, British Columbia, Canada, Oct. 29, 2021. (Photo by Liang Sen/Xinhua)