 An exceptional map that provides peak migration dates as birds migrate north across the continental United States was produced by BirdCast researchers (graphic by Audrey Carlsen; BirdCast data analysis by Adriaan Dokter).
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An exceptional map that provides peak migration dates as birds migrate north across the continental United States was produced by BirdCast researchers (graphic by Audrey Carlsen; BirdCast data analysis by Adriaan Dokter).
Photo 1
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