Geographical distribution of American Wigeon Mareca americana.   Breeding summer visitor  Breeding resident  Nonbreeding winter visitor
BirdLife International. 2016. Mareca americana. The IUCN Red List of Threatened Species 2016: e.T22680163A92846924. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22680163A92846924.en. Downloaded on 30 June 2018.
Cephas