All About Birds – Comprehensive and accessible resource about North American birds, bird watching, and bird conservation from Cornell Lab of Ornithology.
eBird – Online birding checklist program that allows users to record bird sightings, create bird lists, view data from others, and contribute to science and conservation.
Birdingonthe.net – Comprehensive compilation of state and regional birding email lists. Perfect for seeking info and advice when planning your next birding trip.
Sibley Guide – The Sibley Guide to Birds is a reference work and field guide for the birds found in the North American region as defined by the American Birding Association.
American Birding Association – The American Birding Association (ABA) is a non-profit organization, founded in 1969, dedicated to recreational birding in Canada and the United States.
American Bird Conservancy – The American Bird Conservancy (ABC) is a non-profit membership organization with the mission of conserving native birds and their habitats throughout the Americas.