Geographical distribution of Double-crested cormorant.    Breeding  Migration  Year-round  Nonbreeding
BirdLife International. 2016. Phalacrocorax auritus. The IUCN Red List of Threatened Species 2016: e.T22696776A93586016. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22696776A93586016.en. Downloaded on 24 June 2018.
Cephas