Tremblay, Junior A., Rita D. Dixon, Victoria A. Saab, Peter Pyle, and Michael A. Patten. 2016. “Black-backed Woodpecker (Picoides arcticus).” 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/bkbwoo doi: 10.2173/bna.509