Geographical distribution of Cackling goose.    Breeding  Migration  Nonbreeding  Vagrant
BirdLife International. 2016. Branta hutchinsii. The IUCN Red List of Threatened Species 2016: e.T22733619A95060484. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22733619A95060484.en. Downloaded on 18 July 2018.
Cephas