In the fall, Snow Geese migrate some 3,000 miles (4,800 km) from the northernmost reaches of Canada to as far South as Mexico. In the Spring they do it in reverse, and so we get to see them twice a year, in flocks of a few hundreds to as many as hundreds of thousands of them. In the latter case, they cover the ground like snow, and the sight of them lifting up to fly is a wonder of nature.
The above photos were taken at Merrill Creek Reservoir on a bright sunny day three years ago. The following photos are more recent close ups of Snow Geese in flight. They were taken at the Edwin B Forsythe National Wildlife Refuge on an overcast day.