Geographical distribution of Caspian tern.    Breeding  Migration  Year-round  Nonbreeding
BirdLife International. 2017. Hydroprogne caspia (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2017: e.T22694524A111757252. https://dx.doi.org/10.2305/IUCN.UK.2017-1.RLTS.T22694524A111757252.en. Downloaded on 03 June 2018.
Cephas