Subspecies
Puffinus yelkouan (Sibley and Monroe 1990, 1993) has been split into Yelkouan Shearwater (Puffinus yelkouan) and Balearic Shearwater (Puffinus mauretanicus) following Brooke (2004).
Considered by some authors to be a subspecies of Manx Shearwater (Puffinus puffinus).
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