Bechard, Marc J., C. Stuart Houston, Jose H. Sarasola, and A. Sidney England. 2010. “Swainson's Hawk (Buteo swainsoni).” 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/swahaw doi: 10.2173/bna.265