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The captivating, little-known true story of a group of scientists and the methods and technology they developed to uncover the secrets of avian migration.For the past century, scientists and naturalists have been steadily unravelling the secrets of bird migration. How and why birds navigate the skies, traveling from continent to continent - flying thousands of miles across the earth each fall and spring - has continually fascinated the human imagination, but only recently have we been able to fully understand these amazing journeys. Although we know much more than ever before, even the most enthusiastic birdwatcher may not know how we got here, the ways that the full breadth of scientific disciplines have come together to reveal these annual avian travels.