A snowy owl (Bubo scandiacus, formerly Nyctea scandiaca) flies low over the coastline along Boundary Bay in southern British Columbia, Canada. Snowy owls, the largest birds to reside in the Arctic, rarely winter as far south as the Canadian/United States border, but do so once or twice a decade when the owl population is too large for the food supply in their usual winter range. These extended migrations are known as irruptions. Boundary Bay was the winter home for an especially large number of snowy owls during the winter 2011-2012 irruption.
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