Geographical distribution of Razorbill.    Breeding  Nonbreeding
BirdLife International. 2017. Alca torda (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2017: e.T22694852A110637027. https://dx.doi.org/10.2305/IUCN.UK.2016.RLTS.T22694852A110637027.en. Downloaded on 06 August 2018.
Cephas