Geographical distribution of Canvasback.    Breeding  Migration  Year-round  Nonbreeding
Mowbray, T. B. (2002). Canvasback (Aythya valisineria), version 2.0. In The Birds of North America (A. F. Poole and F. B. Gill, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi-org.acces.bibl.ulaval.ca/10.2173/bna.659
Cephas