All Experts Birding: A panel of US birders volunteer to answer questions.
American Bird Conservancy: A not-for-profit dedicated to the conservation of wild birds and their habitats in the Americas.
BBIRD - Breeding Biology Research and Monitoring Database: A national, cooperative program that uses standardized field methodologies for studies of nesting success and habitat requirements of breeding birds.
Bird Checklists of the United States: Hundreds of seasonal occurrence bird checklists for state, federal, and private management areas, nature preserves, and other areas of special interest in the United States.
BirdBrain: A birding portal with learning games, links to news articles, photos, sound files, and links.
BirdCentral: Photo gallery by Jim Rosso; birds in the classroom project.
Birding Tidbits: Crossword puzzles.
BirdingGuide.com: Information, resources, and links for bird watching.
BirdPerch: Photo gallery, magazine photo index, and list of places to bird.
Birds in Nature: Photographs of wild birds by Richard Ditch. Includes an extensive tutorial and information on many aspects of bird photography.
Birds: Bellwethers of Watershed Health: Educational resource on the importance of birds as watershed health indicators and how to improve watershed conditions.
BirdWatch: PBS television series on birds and birdwatching.
Birdwatch America: Supports the business of birding in the US.
Birdwatching in the National Parks: Links to articles and checklists for finding birds on National Park Service land throughout the US.
Identification Issues: Don Roberson's detailed discussions and photos of 10 ID problems, mainly dealing with California birds.
New England Seabirds and Pelagic Birding: Conservation news, checklists of birds and mammals, birding spots, pelagic trips and trip reports, seabird breeding colonies, and tips for a first pelagic trip.
Northern Prairie Wildlife Research Center: Large number of articles with detailed information about United States birds.
Nutty Birdwatcher: Eastern U.S. site with tips for backyard birding, bird migration table, and identification guides.
Robert Winkler - Nature Writing: Excerpts, reviews, bird photos, and links from the author of "Going Wild: Adventures with Birds in the Suburban Wilderness".
Scouting for Birds: Promotes the Boy Scouts' Bird Study Merit Badge, with guides for scouts and teachers.
SEPART-L: Archives and subscription management for the e-mail group for discussion of neotropical migratory birds in the southeastern United States.
State Birds: Official birds for each US state with illustrations and descriptive text by Audubon.
State Birds: The official state birds of every state and tips on how to find them.
Trochilids: Winter western hummingbird reports from Mississippi, Louisiana, and the eastern US.
Ya Know You're a Birder: Bird comics and backyard birding.