This article is from the Birds FAQ, by Lanny Chambers with numerous contributions by others.
Here is a sampling.
Jack Siler's page: http://www-stat.wharton.upenn.edu/~siler/birding.html
http://www.im.nbs.gov
http://www.im.nbs.gov/bbs/bbs.html
http://www.audubon.org/
http://www.fws.gov/~r9endspp/endspp.html
http://www.interlog.com/~gallantg/ontario.html
 
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