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Mystery of Migration

Many of our summer birds -- the neotropical migrants -- travel thousands of miles twice each year between their winter homes in the south and breeding grounds in the north. And even scientists who have spent years trying to solve the mystery of migration don't have all the answers.

Some birds migrate north to south, others east to west. Then there's the wandering albatross, which breeds only every other year. So it can stay at sea for as long as two years at a time, following the ocean currents and prevailing winds in an unending circular migration route around Antarctica...


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