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A detailed identification guide to the nine pinniped species (seals) and 41 cetacean species (whales, dolphins, and porpoises) that have been recorded in the region.
Still, Robert / Harrop, Hugh / Dias, Luís / Stenton, Tim
Europe's Sea Mammals Including the Azores, Madeira, the Canary Islands and Cape Verde
A field guide to the whales, dolphins, porpoises and seals
PRINCETON UNIVERSITY PRESS