• [Wiki] http://en.wikipedia.org/wiki/Poecile_atricapillus.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=B1F0CC82E34E4541&sec=lifehistory.
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• [Smit1991] Smith, S. M. (1991). The Black-Capped Chickadee. Behavioral Ecology and Natural History. Comstock Publishing Associates, Ithaca.