Cornell University
arXiv.org e-Print archive
Online bird guide, bird ID help, life history, bird sounds from Cornell
Project EUCLID Mathematics and Statistics Online
eBird - Discover a new world of birding...
Macaulay Library – A scientific archive for research, education, and conservation, powered by you
NestWatch
FeederWatch - Count Feeder Birds for Science
Explore | Birds of North America Online
Hacking, Distributed