 ASCOBANS covers all species of toothed whales ("Odontoceti") in the Agreement Area, with the exception of the sperm whale ("Physeter macrocephalus").Numerous species of small cetaceans live in the Baltic, Irish and North Seas and the North East Atlantic, including dolphins, whales and harbour porpoises.The harbour porpoise is the most common small cetacean species in the North Sea and the only cetacean species native to the Baltic Sea and therefore is the flagship species of the Agreement.