A total of 28 species of cetacean have been recorded in the ecoregion. There are nine species that are common or regular: harbour porpoise, common dolphin, striped dolphin (Stenella coureoalba), bottlenose dolphin (Tursiops truncates), Risso's dolphin (Grampus griseus), long-finned pilot whale (Globicephala melas), Cuvier's beaked whale (Ziphius cavirostris), sperm whale (Physeter microcephalus), and fin whale (Balaenoptera physalus). Very few seal species occur in the Bay of Biscay and Iberian Atlantic waters.
