At one time, Canada Geese nested mainly in northern regions, and the vast majority were migratory. When captive-reared geese were released to establish new populations across the lower 48 states (most of those birds being of the giant Canada Goose subspecies, which were already short-distance migrants) the introduced birds became very common year-round residents. Meanwhile, Canada Geese nesting in far northern regions of the United States and Canada still migrate long distances as they did historically. ~ National Audubon Society
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