Wood Pigeon (Columba palumbus) flock migrating over the Pyrenees mountains on the border between France and Spain, October.

- Image ID: C71XBF
Wood Pigeon (Columba palumbus) flock migrating over the Pyrenees mountains on the border between France and Spain, October.
Nick Upton / Alamy Stock Photo
Image ID: C71XBF
Millions of pigeons cross the Pyenees from France each autumn to reach Spain for the winter, but must run the gauntlet of thousands of guns trained on them by hunters in blinds and towers along the mountain ridges.
Location: Lindux pass, near Roncesvalles, Spain.