A Snowy Owl Update, from Mass Audubon

Snowy Owl Update

Reblogged from the Neponset River Watershed Association blog, first posted from a Mass Audubon blog

Currently New England is hosting a major incursion of snowy owls, many of which will likely spend the winter in our area.

Photo © Dave Larson

Typically these Arctic visitors tend to appear most frequently near the coast, but the first report this year was inland at Mount Wachusett in Princeton on November 17. Since then, snowy owls have been showing up all over Massachusetts. See a map of recent sightings on eBird.

Why So Many Snowy Owls?

The snowy owl is considered an “irruptive” species—one that responds to changes in the conditions on its home territory by moving elsewhere in search of food.  Some of the factors that may trigger these irruptions include variations in food supply in the Arctic, severe snow and ice cover in their usual wintering areas, or a superabundance of owls resulting from an exceptional nesting season prior to a southward irruption.

For many years it was assumed that snowy owl irruptions only occurred in years when the lemmings that comprise the snowy owls’ primary food in the Arctic were in short supply, thus forcing the starving owls to move south in search of food.

However, Norman Smith, sanctuary director of Blue Hills Trailside Museum and lead of Mass Audubon’s Snowy Owl Project says “We actually see the most snowy owls in New England after an Arctic lemming population boom, not bust.” High lemming populations improve breeding success, and irruptions typically consist mostly of hatch-year birds (ones born this year).

Where to See Snowy Owls

Snowy owls arriving in Massachusetts tend to seek local habitats that mimic the Arctic tundra where they spend most of their lives, such as large salt marshes, extensive agricultural fields, and even airports. Popular sightings include Westport, New Bedford, Nantucket, Orleans, Duxbury Beach, and of course, Plum Island.

Accordingly, if you are passing a large open field this winter, that white spot in the distance might only be an errant piece of plastic, but it could also be a snowy owl!

Reposted from a Mass Audubon blog, posted December 7, 2013 by Hillary. Text by Marj Rine, Photo © Dave Larson

This post is from the Neponset River Watershed Association’s Neponset Nature Blog. The original post can be found at: http://www.neponset.org/happenings/neponset-nature-blog/snowy-owl-update/.