In most winters great gray owls remain in their great north woods home in Canada, the mountains of the western U.S., northern Europe, and Siberia. But every four years or so, apparently motivated by a shortage of food (primarily voles), many of these owls will move southward in search of food.
In northeastern North America, the owls usually stay just north of the border, apparently finding suitable vole populations in southern Quebec and Ontario, but a handful of individuals will sometimes move further south into northern New York and New England. This is one such winter with a number of great gray owls being reported in southern Quebec, two reports from central Maine, and reports of several great gray owls in northern New York. » Continue Reading.