Billion bird night recorded this week as 1.25B birds flew across U.S.
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Autumn bird migration typically peaks in the northern United States in late September and early October. On Wednesday night, around 9:40 p.m. EDT, scientists estimated that 1.25 billion birds were in flight, mostly in the Southeast, where a northerly breeze behind a cold front helped birds move south for the winter. BirdCast , a research consortium consisting of scientists from The Cornell Lab of Ornithology, Colorado State University and UMass Amherst, said on Facebook this was a new record ,
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