A Snowy Owl Sequel?

By Pat Leonard
January 16, 2015
Snowy Owl by Missy Mandel/GBBC.
                    State of North America's Birds 2016 report            

Last year’s blizzard of Snowy Owls in the Great Lakes states, the Northeast, and down the Atlantic Coast was epic, an unprecedented irruption.

Now some birders are asking, is it happening again?

Snowy Owls are being seen and reported on eBird this winter across the northern-third of the Lower 48 states from Washington state to Maine, with some reports of snowies as far south as Oklahoma and Maryland.

Scientists surmise that last year’s large southward sweep of Bubo scandiacus east of the Mississippi River was triggered by a record nesting season among the breeding population in northern Quebec.

map of Snowy Owl sightings via eBirdThis winter Snowy Owl reports are lighting up eBird maps for the Northeast and Great Lakes. ( See a larger map.)

When it came time for fledglings to disperse, some among the bumper crop of young snowies had to travel far south to find food. The majority of Snowy Owls seen in the Lower 48 states last year were young males.

This past summer, there was another bumper crop—this time in Nunavut. Researchers from Canada’s Laval University reported record numbers of Snowy Owls nesting on Bylot Island. The previous high found in and around their research plot was 33 nests in 2010; this year they found 116 nests.

So this winter’s Snowy Owls could be returnees from northern Ontario, new birds from Nunavut, or a mix of both. A Snowy Owl geotracking effort called Project SNOWstorm may help answer that question. (See Science from a Snowstorm below.)

Comparing the frequency of Snowy Owls reported on eBird checklists in the Northeast shows that so far this has been a good winter for snows…but nothing like last year. Graph from The Cornell Lab’s Birdcast article, Species on the move: Snowy Owl.

According to Marshall Iliff, a project leader on the Cornell Lab of Ornithology’s eBird team, this year’s winter Snowy Owl flight into the Lower 48 is impressive but not at the scale of last year’s irruption. For comparison, last winter a 5-state block in the Northeast had more than 8,000 reports of Snowy Owls from November to January. This winter that same block has had 1,200 snowy reports so far.

Still, Iliff says, it’s an above-average winter for snowies.

“This flight can be thought of as an echo flight,” said Iliff. “Echo flights are above average flight years following a very above average year. The exact cause is unknown and might be related to good summer food resources [lemmings] continuing from the previous year, another region with above average food resources, or possibly one-year-old birds returning south via last year’s route.”

For up-to-date reports on where snowies are being seen this winter, check out this custom eBird Snowy Owl map. You can also sign up for eBird’s Snowy Owl alert service.


Science from a Snowstorm

Very little is known about where Snowy Owls go when they travel back north after an irruption. So with snowies in spades last winter, noted naturalist/author Scott Weidensaul helped organize a scientific effort called Project SNOWstorm to put solar-powered data loggers on Snowy Owls and track their movements.

A Snowy Owl with a Project SNOWstorm solar-powered data logger on its back is helping scientists learn more about where Snowy Owls go when they travel back north after an irruption. Photo by Alan Richard.

Last winter the project tagged 22 owls in 7 states. Now they’re waiting for some of these owls to return. Their data loggers will download automatically once they’re within cellular signal range.

So far this winter three tagged owls have flown back within cell range in southern Ontario. The downloaded data from one owl showed that it flew 1,200 miles north from where it was tagged in Erie, Pennsylvania, to spend summer in the subarctic tundra near the Hudson Strait. This may be where this owl was born, since it’s the area of northern Quebec that had a record Snowy Owl nesting season. By October, the owl had flown back south to the St. Lawrence River Valley along the Ontario–New York border.

The SNOWstorm team hopes to tag another eight to 10 owls this winter. If they do, scientists may be able to determine if this winter’s owls return to Ontario, Nunavut, or somewhere else during the breeding season.

To see project updates, visit the Project SNOWstorm blog.

For more about Snowy Owls:

Comments

  • There was a snowy owl last Winter in Tybee Island, Georgia for several days. Don’t know if anyone here reported it or not. I have not heard of any sightings this year.

  • Jim Sweeney

    So this then begs the question, “why has the lemming population spiked in Canada” causing the irruptions to the lower 48?

  • Eeleonore Zimermann

    Do tey come from Antartica? What aut Iceland, Faraoe or northern China?

  • William Fogerty

    Very interesting info on the snowy owl. The map is really good and well done.

    Was wondering is there an app for MacBook laptops yet? Mine is the MacBook Air. I have the app for the iPhone and I know it has not been available for the operating systems with Apple computers.

    Thanks

  • Joy Rudd

    Snowy owls have been sighted in the Sudbury, Ontario region. A photograph was printed on the front page of our newspaper, “Northern Life”, last week.

  • victoria

    Thanks William!
    At the moment, the Merlin app is not available on the Mac App Store, only for iPhone and iPad, but we are working on a web version so people can use Merlin in their web browser. We don’t have an estimated release date for the web version yet. In the meantime, check out eBird on your laptop to find dynamic range maps of hundreds of species.

  • victoria

    Snowy Owls are only found in the Northern Hemisphere. You can find a good map here. Also, here is description of their distribution from the Birds of North America online: “In North America in the w. Aleutians (Attu, Buldir), Hall Island (Bering Sea), and from n. Alaska and throughout the Canadian Arctic Islands south to coastal w. Alaska (Hooper Bay), n. Yukon, n. Mackenzie, s. Keewatin, ne. Manitoba (Churchill), n. Quebec and n. Labrador. Europe/Asia: From n. Greenland, n. Scandinavia, n. Russia, s. Novaya Zemlya, and n. Siberia south to the limits of tundra in Eurasia and the Commander Islands. Rarely in British Isles. (SeeCramp 1985 for details).” I hope this helps.

  • Victoria Cumberland

    When food is plentiful there is more breeding. The offspring have to travel further from the home nest to find a new territory to live.

  • Laura Bode

    Can snowy owls still on found on Long Island at this time of year?

  • victoria

    Thanks for asking. Yes, it is possible to see Snowy Owls on Long Island in March, but they will soon be leaving to head back up north. Check out our Snowy Owl eBird map to find where they are and where they have been.

  • Carol

    I’m in California central coast and up until a day or two ago had to fill my feeder every day, there were so many hummingbirds eating from it.. Then I ran out of the usual food, and bought Perky Pet HB food mix. Since then they won’t go near my feeder. I’m wondering if it’s that particular brand they don’t like?

    [This comment has been migrated from an earlier post version by Cornell Lab staff.]

  • Barbara Teeter

    It is late April in East Central Alberta and there are 1 maybe 2 pairs of Snowy Owls that appear to have remained from Winter. Interesting sidebar, there are also thousands of Snowy Geese and Ross Geese still feeding on the ag land. Could it be possible that these species will stay?

    [This comment has been migrated from an earlier post version by Cornell Lab staff.]

  • M BH

    I observed a Snowy Owl at Salisbury Beach in MA on 12/11/15, and there is a SNOWY OWL at Rye Beach, NH that seems to have staked territory for itself at this site. It’s been observed daily for a good week or more. I observed it today (12/17/15).