Frei, Barbara, Kimberly G. Smith, James H. Withgott, Paul G. Rodewald, Peter Pyle, and Michael A. Patten. 2017. “Red-headed Woodpecker (Melanerpes erythrocephalus).” 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/rehwoo