All About Birds - Bird Guide. 2006. Cornell Lab of Ornithology.

Bird Identification Tips. 4 April 2007. United States Geological Service.

Peterson, Roger Tory and Virgina Marie Peterson. A Field Guide to the Birds of Eastern and Central North America, Fifth Edition. Boston: Houghton Mifflin Co., 2002

Sibley, David Allen. The Sibley Guide to Birds. Chanticleer Press, 2000.




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