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Migratory schedule of swallows uncovered

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The study is the first to track the timing of 12 geographically distinct breeding populations of tree swallows across the continent. Researchers measured how long birds spent at breeding grounds to raise their young, when they began migration and stopped to refuel, and when they arrived at wintering grounds. Understanding when birds move between breeding and wintering sites, and how different populations move, can help identify the greatest threats to survival.O9o1bdOzw80

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