Sources
Bent, Arthur Cleveland. 1964. Life Histories of North
American Jays, Crows and Titmice. Part II.
Dover Publishing, Inc. New York, NY.
"Passeriformes." Encylopaedia Britannica. vol 13.
1983.
Peterson, Robert Troy. 1980. Peterson Field Guides:
Eastern Birds. Houghton Mifflin Company. New York, NY.
Smith, Susan M. 1991. The Black-capped Chickadee: Behavior
and Natural History. Cornell University Press. Ithaca, NY.
Terres, John K. 1982. The Audobon Encyclopaedia of North
American Birds. Alfred Knopf, Inc. New York, NY.
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