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Acknowledgments
Data on clutch size provided by Lloyd F. Kff of the Western Foundation of Vertebrate Zoology. Breeding Bird Survey data provided by Jeff T. Price, computed from BBS census data. Drawings in Figures 3 and 5 by Julie Zickefoose. Original field studies by SMS were supported by the National Science Foundation. Further field studies by LMR, DJM, JRF were supported by the Natural Sciences and Engineering Research Council of Canada.
Thanks to Paul Lehman for help revising the Distribution section.
Foote, Jennifer R., Daniel J. Mennill, Laurene M. Ratcliffe and Susan M. Smith. 2010. Black-capped Chickadee (Poecile atricapillus), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/039
