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USFWS: An 'Irruption' of Snowy Owls


Bureau: Fish and Wildlife Service

Look out, East Coast — already there have been many more sightings of snowy owls this season and much farther south than expected. And the sightings continue.

snowy
There have been numerous snowy owl sightings at national wildlife refuges. This photo was taken at Edwin B. Forsythe National Wildlife Refuge. Photo by Don Freiday, USFWS.

An irruption, in birding, is when a species of bird moves into an area where it doesn’t normally winter. Snowies have been spotted in North Carolina this year, in what’s being considered one of the most dramatic snowy irruptions witnessed in recent years. This wintering season, one was even spotted in Bermuda — certainly a warm weather destination far from the upper latitudes where they typically make their home.

Snowy owl sightings this year

While some species of birds winter in unorthodox areas because of a lack of food in their normal wintering grounds, many believe these snowies are moving south this winter for another reason. It might suggest that prey was abundant this summer in the eastern Arctic, leading to excellent breeding conditions. Some biologists believe that after an initial boom in the lemming population ended, high numbers of these young owls took flight to find resources elsewhere.

Snowies like open areas, like shorelines and open fields, and unlike most owls, are diurnal — that is, they’re active both in the day and night. That said, these owls still hunt at night and remain relatively sedentary during daylight. But as awesome (in the original sense of the word) as seeing one of these birds is, take care not to disturb or get to close to them! As a migratory bird, snowies are protected under the Migratory Bird Treaty Act of 1918. The recent interest in snowy owls is perhaps thanks to the popular “Harry Potter” franchise of books and movies. In the films, the protagonist’s pet owl is played by the male snowy owl Gizmo.

These Arctic nomads are capable of crisscrossing continents in search of abundant prey, sometimes flying more than 600 miles each summer. They can cross oceans or even hunt on of ice flows. So, I hope you have the good fortune to spot a snowy owl this winter.

By: Tom Barnes, intern, USFWS
Jan 23, 2014


A version of this article was posted Dec. 27 on the USFWS Northeast Region's blog.