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New Study Finds U.S. and Canada Have Lost More Than One in Four Birds in the Past 50 Years | Smithsonian's National Zoo and Conservation Biology Institute
https://nationalzoo.si.edu/news/new-study-finds-us-and-canada-have-lost-more-one-four-birds-past-50-years
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Data show that since 1970, the U.S. and Canada have lost nearly 3 billion birds, a massive reduction in abundance involving hundreds of species, from beloved backyard songbirds to long-distance migrants.
