If there were major road systems marked in the skies for waterfowl, then flyways would be those routes.  Used by migratory birds as a result of evolutionary history and genetic programming, and layered with some learned experiences, these routes vary from the simple and uncomplicated to the extremely complex.  No two bird species follow the exact same path from beginning to end.  And flyways can be greatly affected from year to year by weather conditions, predators, hunting pressure and available food and water sources.  Too, the waterfowl populations that use these preferred migratory routes differ greatly in their numbers, travel speeds, travel distances, breeding ground origins and final destination points. 

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