Geographical distribution of Bufflehead.    Breeding  Migration  Year-round  Nonbreeding
BirdLife International. 2016. Bucephala albeola. The IUCN Red List of Threatened Species 2016: e.T22680462A92863192. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22680462A92863192.en. Downloaded on 28 June 2018.
Cephas