American Ornithologists' Union  
   The oldest and largest organization in the New World devoted to the scientific study of birds. Includes the authoritative Check-List of North American Birds.
   http://www.aou.org/

Association of Field Ornithologists  
   Society of professional and amateur ornithologists with a focus on the Western Hemisphere, particularly the Neotropics. Journal of Field Ornithology, banding supplies, organizational info, awards program, Neo-Ornithological literature citations, and guide
   http://www.afonet.org/

Cooper Ornithological Society  
   Professional organization whose goal is to advance the scientific study of birds and their habitats, and support their conservation. Includes full archive for journal The Condor.
   http://www.cooper.org/

Neotropical Ornithological Society  
   Information about the society and its journal Ornitologia Neotropical.
   http://www.neotropicalornithology.org/

Western Field Ornithologists  
   The ornithological society for western North America, Hawaii, and the Northeastern Pacific Ocean. Western Birds tables of contents, meetings and events, and the California Bird Records Committee.
   http://www.wfo-cbrc.org/

Wilson Ornithological Society  
   The Wilson Society, founded in 1888, is a world-wide organization of nearly 2500 people who share a curiosity about birds. Named in honor of Alexander Wilson, the Father of American Ornithology, the Society publishes a quarterly journal of ornithology, T
   http://www.ummz.lsa.umich.edu/birds/wos.html