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A series of radar images was taken around sunrise show changes in migrating birds' activity.
Credit: K. Archibald, with data from NOAA
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Migrating birds pile up along Great Lakes' shores: Birds prefer to migrate at night -- so much so that if day breaks while they're over water, they'll turn back toward the nearest shore rather than pressing on, concludes a new study that used weather radar to examine the behavior of birds crossing the Great Lakes.
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