AOU and COS Complete Merger

The American Ornithological Society (AOS) is official! The American Ornithologists’ Union and Cooper Ornithological Society officially merged to form AOS in October 2016.

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The American Ornithological Society

Explore the American Ornithological Society (AOS). Become a member; get involved!

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American Ornithology: Photo of Baltimore Oriole - (c) Lloyd Spitalnik

AOS-SCO Annual Meeting 2017

Birds of the Anthropocene. July 31–August 5, 2017.

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AOS-SCO 2017 Meeting Logo

Contribute to Citizen Science

Get involved! Participate in bird surveys; contribute your data.

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American Ornithology: Photo of Canada Goose chick - (c) Paul Marto

Teaching or Studying Ornithology?

Access scientific, photographic, and other information about birds.

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American Ornithology: Photo of the Common Nighthawk - (c) Shawn Billerman

Access Scientific Resources

Get current information on bird taxonomy, biodiversity, populations, sounds, and references.

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American Ornithology: Photo of the Green Honeycreeper - (c) Morgan Tingley

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

© 2017 American Ornithological Society