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A membership institution interpreting and conserving the earth's biological diversity through research, education, and citizen science focused on birds.
http://www.birds.cornell.edu/
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The RSPB is the UK charity working to secure a healthy environment for birds and all wildlife, helping to create a better world for everyone. We depend on the goodwill and finan...
http://www.rspb.org.uk/
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eNature: Your Guide to America's Wildlife -- Comprehensive, Accurate, and Local
http://www.enature.com/home/
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http://www.hummingbirds.net/index.html
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Birds in Backyards is a research, education and conservation program.
http://www.birdsinbackyards.net/
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http://digital.library.pitt.edu/a/audubon/
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http://www.birdsource.org/gbbc
