- ABA - American Birding Association
The American Birding Association is a non-profit 501(c)(3) organization that provides leadership to birders by increasing their knowledge, skills, and enjoyment of birding.
- Birds of North America Online
Birds of North America (BNA) is the most comprehensive reference for the life histories of over 760 bird species that breed in the United States and Canada. Species accounts are written by ornithologists and other experts and are an essential reference for anyone with an advanced interest in birds.
- National Audubon Society,
National Audubon Society. Audubon protects birds and the places they need, today and tomorrow.
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