NYLON – The shallow dust called Nations Road is buried under sweeping drifts. The snow glides lazily in the open, sometimes curling in the shadow of a leaning fence post. Just as the sun crests the head of a hill, two brilliant golden eyes open and blink.
The wind folded over the owl’s shoulders. The sun poured over him and faint scratchings and peeps of the mice and voles floated to him from all around. He crouched and leaped into a puff of bitter Arctic air. Imperceptibly, a small black box on his back pinged a signal to unseen human researchers many miles away, and told them that ‘Geneseo’ the snowy owl was on the move.
That was in 2015, when ‘Geneseo’ rode the wind up and down the crusted fields on Nations Road. His last signal pinged from a beach in Long Point National Wildlife Area near Old Cut, Ontario, at 7:12 a.m. on April Fool’s Day, 2015. The little transmitter, installed by Tom McDonald with Project SNOWstorm on Feb. 21, 2015, had ridden with ‘Geneseo’ for over a month, after having mapped a tightly woven line of his routes throughout Geneseo, York and Avon, then far west across Lake Erie to southern Ontario.
Project SNOWstorm continues to this day, actively tracking eight snowys across the US and Canada and preserving tracking data on a further 45.
Project SNOWstorm says that an irruption has brought exceptional numbers of snowys into the region and the United States in general, as the owls for unknown reasons flood down from the high north. Project SNOWstorm’s extensive information on irruptions on their website is as follows:
Snowy owl migration is complex; some birds migrate south predictably and regularly, while others remain on the breeding grounds or actually move north, onto the Arctic sea ice, hunting in perpetual winter darkness. But every once in a while, for reasons that are not fully understood, snowy owls come flooding down from the north in a phenomenon known as an irruption.
Smaller irruptions happen, on average, every four or five years, but once or twice in a lifetime a mega-irruption occurs, when snowy owls show up much farther south, and in vastly greater numbers, than usual.
The winter of 2013-14 was one such extraordinary event, the largest irruption in the Northeast and Great Lakes regions perhaps a century. Snowy owls were reported as far south as Florida and Bermuda. In 2014-15, another sizeable irruption occurred in the Great Lakes and East, and farther west than the previous year’s. Another large irruption is occurring in the winter of 2017-18.
Most people assume that hunger has driven these owls south, and that they are doomed to slowly starve to death in this unfamiliar southern landscape. Both assumptions are generally wrong.
It appears it’s not hunger that produces these mega-flights, but an absurd abundance of food during the summer breeding season. High populations of lemmings, voles, ptarmigan and other prey lead to large clutches of owl eggs. There is growing evidence that snowy owls from many parts of the Arctic may congregate to nest in areas where prey is abundant.
Of the three active owls in New York State, all three have camped out on the shores of Lake Ontario, and two have cruised through the Rochester Region.
That happened during the summer of 2013 in northern Quebec, where lemming populations were booming and snowy owls enjoyed a banner nesting season. That autumn, thousands of those young owls moved south.
During the summer of 2014, snowy owls had a banner breeding season on Bylot Island in the Canadian Arctic. That may have been responsible for the unusually large number of irrupting snowy owls that moved in the Northeast and Great Lakes the following winter. Another major breeding event in northern Quebec in the summer of 2017 may have been at least partially responsible for an irruption six months later.
Far from starving, most of these Arctic migrants are perfectly healthy – in fact, researchers have found that snowy owls in major irruption years tend to be fatter and heavier than those in non-flight years. Only occasionally do food shortages appear to prompt southerly movements of snowy owls (as happens routinely with species like great gray and northern hawk owls). In those cases, many of the owls are adults, not juveniles.
Not all of the snowy owls that come south in winter will survive, of course – the mortality rate for young raptors of any species is very high. But most will succumb to vehicle collisions, rodenticide poisoning and electrocution on power lines, to name three common causes. Starvation is fairly rare, and often the result of other, underlying causes, although starving birds are more likely to be found and taken to rehabilitators.
NYLON is the New York Local Online News section of the GeneseeSun.com, dedicated to uniting communities outside of Livingston County.