Depending on the species, birds may migrate hundreds, thousands or even tens of thousands of miles every year. They travel between their winter range and breeding range and back again, always arriving at the same geographic region at very nearly the same dates annually, and many young birds undertake this journey without parental guidance or any prior experience. Storms, predators, lack of food and other obstacles stand in birds' way, but they persevere in this annual cycle. How? - See more at: http://www.agway.com/know_how/wild_birds/bird_watching/how_birds_migrate.html#sthash.PUQ5SguG.dpuf
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