The American Ornithologists' Union (AOU) was established in 1883, making it "the oldest and largest organization in the New World devoted to the scientific study of birds." Although primarily "a professional organization, its membership of about 4,000 includes many amateurs dedicated to the advancement of ornithological science." The AOU website contains information about membership, upcoming meetings, awards, a variety of publications, and more. The site also offers access to a comprehensive checklist for birds of North America; a preliminary classification of the bird species of South America; and online copies of the Ornithological Societies of North America's _Ornithological Newsletter_. Notably, the AOU site links to an online job board featuring a range of ornithological opportunities including tenure-track faculty positions, research assistantships, and internships.