Photograph of Northern Parula - (c) David Speiser

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Welcome to the American Ornithological Society (AOS), formed in 2016 with the merger of the American Ornithologists' Union and Cooper Ornithological Society. Access information about the society, our activities, and how you can contribute.

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Welcome to the American Ornithological Society (AOS)
Advancing Scientific Knowledge and Conservation of Birds

© 2017 American Ornithological Society