Geographical distribution of Great blue heron.    Breeding  Year-round  Nonbreeding
BirdLife International. 2016. Ardea herodias. The IUCN Red List of Threatened Species 2016: e.T22696998A93597223. https://dx.doi.org/10.2305/IUCN.UK.2016-3.RLTS.T22696998A93597223.en. Downloaded on 01 August 2018.
Cephas