Birdwatchers gather before dawn at Middle Creek in Pennsylvania to witness thousands of migrating snow geese lifting off from the reservoir in a swirling mass. The display lasts only minutes before the birds fan out to nearby farm fields to feed as they continue their annual spring migration north toward New York and Quebec. For a few short weeks each year, the migration draws crowds of nature lovers to the refuge, which was created decades ago to attract waterfowl and now welcomes about 150,000 visitors annually.
___
This is a photo gallery curated by AP photo editors. Read the full story here.
