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The Cooper Ornithological Society (COS) commemorates an early western naturalist, Dr. James G. Cooper, and grew from a small band of naturalists in 1893 to an internationally recognized scientific society. COS has always been committed to the conservation and management of bird species by applying high-quality science, grounded in natural history, to our understanding of avian biology. The society merged with the American Ornithologists' Union in 2016 (effective 11 October) to form the American Ornithological Society.

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