No seals are common in the Bay of Biscay and Iberian Atlantic waters. Twelve species of cetacean occur commonly or are resident in the Celtic Seas: minke whale Balaenoptera acutorostrata, fin whale Balaenoptera physalus, harbour porpoise, short-beaked common dolphin Delphinus delphis, striped dolphin Stenella coeruleoalba, sperm whale Physeter macrocephalus, long-finned pilot whale Globicephala melas, northern bottlenose whale Hyperoodon ampullatus, Cuvier’s beaked whale Ziphius cavirostris, Sowerby's beaked whale Mesoplodon bidens, Risso’s dolphin Grampus griseus, and bottlenose dolphin Tursiops truncatus. There is no information on trends in the abundance of marine mammals in this region.
Threatened and declining marine mammals species in the Bay of Biscay and Iberian Coast ecoregion according to OSPAR:
Balaenoptera musculus Blue whale
Eubalaena glacialis Northern right whale
Phocoena phocoena Harbour porpoise