Pho­coena pho­coena, also known as the "Com­mon" or "Har­bor" Por­poise, is a small cetacean that is 1.5 to 2 me­ters long and weighs from 45 - 65 kilo­grams. The fe­male of the species is usu­ally slightly larger than the male.

The harbour porpoise (Commonwealth English), or harbor porpoise (American English) (Phocoena phocoena) is one of eight extant species of porpoise. It is one of the smallest species of cetacean. As its name implies, it stays close to coastal areas or river estuaries, and as such, is the most familiar porpoise to whale watchers.

Phocoena phocoena Description: The harbour porpoise is one of six species of porpoises. It is the most abundant cetacean species in the North Sea and the only native species inhabiting the Baltic Sea and is the flagship species of ASCOBANS.