Sources
National Audubon Society Field Guide to Birds Eastern Region, 16th edition, revised by John Bull and John Ferrand Jr. (Alfred A. Knopf, Inc.: New York, 2007)
The Audubon Society Guide to Attracting Birds: Creating Habitats for Properties Large and Small, 2nd edition, by Stephen W. Kress (Cornell University Press: Ithaca and London, 2006).
Cornell Lab of Ornithology: All About Birds, http://www.birds.cornell.edu/AllAboutBirds
Enature.com, http://www.enature.com
Special thanks to Craig Tufts, chief naturalist with the Natural Wildlife Federation