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September 2019 - Denver Audubon

Billions of Birds Lost Since 1970

Study Estimates Nearly 3 Billion Birds Gone Since 1970 On September 19, 2019, Science published a study that estimated North American bird populations have decreased by approximately 2.9 billion since 1970, which represents a 29% loss over 48 years. The study: Was co-authored by Cornell Laboratory of Ornithology, American Bird Conservancy, National Wildlife Research Centre,

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