American Birding Association
The American Birding Association (ABA) is a nonprofit organization, founded in 1969, dedicated to recreational birding in Canada and the United States. It has been called "the standard-bearer for serious birding in North America." Originally concentrated on finding, listing, and identifying rare birds, the ABA now seeks to serve all birders with a wide range of services and publications.
Source: Wikipedia — American Birding Association (CC BY-SA 4.0)