Migration forecasts could help prevent wind turbines and buildings from killing millions of birds.
Van Doren and Horton calculated the number of migratory birds on a massive scale. They analyzed radar images from 143 sites across the continental United States, examining the same half-hour period each night between March and May, the migration season. By looking at records from 1995 to 2017, they also were able to estimate for the first time the average number of birds migrating on any given night across the entire United States: about 200 million, they report on the preprint server bioRxiv. The mass movement peaks at 520 million birds, typically in early May.
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