Geographical distribution of Eurasian wigeon.    Breeding  Nonbreeding
BirdLife International. 2017. Mareca penelope (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2017: e.T22680157A111892532. https://dx.doi.org/10.2305/IUCN.UK.2017-1.RLTS.T22680157A111892532.en. Downloaded on 30 June 2018.
Cephas