All About Birds [ http://www.birds.cornell.edu/programs/AllAboutBirds ]

Patuxent Bird Population Studies [ http://www.mbr-pwrc.usgs.gov ]

BirdSource [ http://www.birdsource.org ]
Partnership between citizens and scientists where the enthusiasm of birders combines with technology to promote conservation. Birders contribute data that helps scientist define birds ranges, populations, migration pathways, and habitat needs.

Birder.com [ http://www.birder.com ]
New photos, quizzes and bird songs appear almost daily. Rare bird alerts, scientific discoveries, checklists of birds, it's all here.

About.com: Birding/Wild Birds [ http://birding.about.com ]
Offers articles about bird songs, field guides, a chat room, instructions for constructing a birdhouse, and more.

Fat Birder [ http://www.fatbirder.com ]
Linking birders worldwide. Includes news, sights and sounds, and guides to birding by continent.

WildBirds.com [ http://www.wildbirds.com ]
Provides information for backyard birders.

Birds and Birding in India [ http://www.birding.in ]
Learn about bird watching and avifauna in India and South Asia. Includes resources for ornithologists.

Birdingonthe.Net [ http://www.birdingonthe.net ]
Rare bird alerts, art galleries, and a worldwide directory of birds and related sites.

Better View Desired [ http://betterviewdesired.com ]
Reviews/evaluations of the best in birding optics inspiration/instruction for birders at all levels.

World Bird Guide [ http://www.mangoverde.com/birdsound ]

Birding Guide [ http://www.birdingguide.com ]
Features a directory of United States birding clubs, bird watching trips, binocular reviews, and a photo gallery.

SurfBirds.com [ http://www.surfbirds.com ]
Offers photos quizzes, life list rankings, identification articles, and more.