Patuxent Wildlife Research Center
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Herb Wilson’s Home Page http://www.colby.edu/personal/w/whwilson/
USA National Phenology Network http://www.usanpn.org/
Journey North: A Global Study of Wildlife Migration and Seasonal Change http://www.learner.org/jnorth/
Project Budburst http://www.windows.ucar.edu/citizen_science/budburst/
The American Ornithologist’s Union http://www.aou.org/
AOU: South American Classification Committee http://www.aou.org/checklist/south.php3
Maryland Yellow Book 1968 Version http://www.mdbirds.org/publications/yellowbook/yellowbook.html
NBII Bird Conservation Node http://birdcon.nbii.gov/
International Migratory Bird Day http://www.birdday.org/