Foote, Jennifer R., Daniel J. Mennill, Laurene M. Ratcliffe, and Susan M. Smith. 2010. “Black-capped Chickadee (Poecile atricapillus).” The Birds of North America, edited by Paul G. Rodewald. Ithaca: Cornell Lab of Ornithology. Retrieved from the Birds of North America: https://birdsna.org/Species-Account/bna/species/bkcchi doi: 10.2173/bna.39