Three snowy owls (Bubo scandiacus formerly Nyctea scandiaca) rest on an old stump along Boundary Bay in southern British Columbia, Canada. The bay, located along border of the United States and Canada, is well south of the typical snowy owl range. Once or twice a decade, owls migrate farther south in an event known as an irruption. Irruptions happen when the snowy owl population is too large for the available food supply on the Arctic tundra.
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