Vote on Proposed AOU-COS Merger

Calling all members of COS to cast your vote on whether to merge with the AOU. The voting period for COS members closes on 2 August 2016. Your vote matters—take action today!

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American Ornithology: Photo of Burrowing Owl - (c) Matt Bango

The American Ornithologists' Union and Cooper Ornithological Society

A  gateway to information about the AOU and COS and resources for the scientific study and conservation of birds. Become a member; get involved!

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

NAOC Conference 2016

Join us in Washington, DC, August 16–20, 2016 for the largest-ever North American Ornithological Conference (NAOC), with experts from all over the Western Hemisphere.

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Logo for the 2016 North American Ornithological Conference.

Contribute to Citizen Science

Participate in bird surveys and submit your bird observations. Join the American Ornithologists' Union and Cooper Ornithological Society, and/or donate to support their many activities.

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

Teaching or Studying Ornithology?

Attend meetings of the American Ornithologists' Union and Cooper Ornithological Society for up-to-date scientific information about birds. Access educational and photographic resources.

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

Access Scientific Resources

Want easy access to resources for the study and conservation of birds? 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 our gateway to ornithology societies and resources
Promoting understanding, appreciation, and conservation of bird species and populations
The American Ornithologists’ Union and Cooper Ornithological Society

© 2016 American Ornithologists' Union
and Cooper Ornithological Society