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These are some of the approximately 1,000 birds that slammed into McCormick Place in Chicago on Oct. 5, 2023. That was a night and morning when especially high numbers of birds were migrating along Lake Michigan. The building's windows have since been treated with a film that makes them visible to birds. Very few birds have hit the windows since then.
Daryl Coldren
/
Field Museum
An ornithologist spent four decades tracking 40,000 bird deaths at a single building. His records paved the way to better scientific and public understanding.
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