PhysOrg Posted August 28, 2019 Share Posted August 28, 2019 On many evenings during spring and fall migration, tens of millions of birds take flight at sunset and pass over our heads, unseen in the night sky. Though these flights have been recorded for decades by the National Weather Services' network of constantly scanning weather radars, until recently these data have been mostly out of reach for bird researchers. View the full article Link to comment Share on other sites More sharing options...
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