=Geographical distribution of Trumpeter swan.    Breeding  Year-round  Nonbreeding
BirdLife International. 2016. Cygnus buccinator. The IUCN Red List of Threatened Species 2016: e.T22679859A92832376. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22679859A92832376.en. Downloaded on 01 July 2018.
Cephas