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Image: Serge Melki - CC BY 2.0, via Wikimedia Commons
Geese flying high above, heading south in V-shaped flocks is perhaps the classic picture of migration—the annual, large-scale movement of birds between their summer, breeding homes and their winter ranges. But geese are far from our only migratory birds. Of the more than 650 species of North American birds, more than half are migratory species.
Birds migrate with the seasons, following food resources and nest locations, moving northward in the spring to take advantage of burgeoning food resources and an abundance of of nesting locations.
As winter arrives and the availability of food resources begin to decline, birds move south again, escaping the oncoming cold.
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