Black-capped chickadees Poecile atricapillus sing at higher pitches with elevated anthropogenic noise, but not with decreasing canopy cover

Proppe, D. S., Avey, M. T., Hoeschele, M., Moscicki, M., Farrell, T., St Clair, C. C., & Sturdy, C. B. (2012). Black-capped chickadees Poecile atricapillus sing at higher pitches with elevated anthropogenic noise, but not with decreasing canopy cover. doi:https://doi.org/10.1111/j.1600-048X.2012.05640.x