Canada (B), Greenland (B) (NB), Russia (Asian) (B), Russia (European) (B), Svalbard and Jan Mayen Islands (B), USA (B).
Vagrant to Belgium, Czech Republic, Denmark, Faroe Islands, Finland, France, Germany, Iceland (NB), Ireland, Italy, Japan, Netherlands Antilles, Norway, Poland, Russia (Central Asian), St Pierre and Miquelon (NB), Sweden, Switzerland, United Kingdom.
Population
Estimated population is 15,000 - 25,000 (2010) and decreasing.
The Reader's Digest Book of British Birds 1980, 3rd Edition, Drive Publications Ltd ISBN 0 340 25308 8
Birds in Colour Campbell, B., 1960, Penguin Books Ltd
The Pocket Guide to Nest and Eggs Fitter, R.S.R., 1954, Collins
RSPB Handbook of British Birds Holden, P., Cleeves, T., 2002, A & C Black ISBN 0 7136 5713 8
Birds of Britain and Europe Sterry, P., et al., 2001, AA Publishing ISBN 0 7495 3068 5
The Popular Handbook of British Birds Hollom, P.A.D., 1973, H.F. & G. Witherby Ltd ISBN 0 85493 002 7