Thousands of snowy owls are flying south this winter in a mass migration that scientists say is highly unusual. The majestic creatures, which can grow up to two feet tall and have a wingspan of nearly five feet, call the Arctic home. But recently, bird-watchers have reported sightings across the U.S., from Maine to Washington. Although it is normal for some snowy owls to head south every few winters, this year's migration has been widespread. Get a close look at these white owls from the north through video and photographs captured by the Cornell Lab of Ornithology's Gerrit Vyn.

Learn more about the Lab's work and conservation efforts at www.birds.cornell.edu. (Video courtesy Cornell Lab of Ornithology)