Birds
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All About Birds(Cornell Lab of Ornithology) - for the bird watcher
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AvibaseThe World Bird Database
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Bird IdentificationFill out a form to identify a bird; emphasis on northeastern & central US & Canada
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Birds of North America OnlineAlso in paper SCIENCE QL681 .B625
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The Internet Bird CollectionThousands of videos of the world's birds
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Ornithology ExchangeAn online community forum of individuals and organizations interested in ornithology
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Xeno-canto: bird sounds from around the worldSearch through the growing collection, identify or discuss unknown sounds and download freely.
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SORA - Searchable Ornithological Research ArchiveOpen Access ornithological publications archive
Surveys and Counts
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eBirdPremier citizen science database
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Bird Monitoring in North AmericaTrack changes in North American bird populations.
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Breeding Bird SurveyUSGS Patuxent Wildlife Research Center
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Check-list of North American Birds (AOU)Official source on the taxonomy of birds found in North and Middle America
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Christmas Bird Count100 + years of data from the National Audubon Society
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Partners in FlightIncludes databases: Species Assessment Database, and Population Estimates Database
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State of the World's BirdsBirdLife International
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U.S. Fish & Wildlife Service Migratory Bird ProgramSee the Surveys & Data link