The harbor porpoise, Phocoena phocoena, is among the smallest of the six porpoise species in the Family Phocoenidae, with an adult length of 1.4 m to 1.9 m (4.6–6.2 ft). They are rotund, have a stubby beak with small, spade-shaped teeth, and a triangular-shaped dorsal fi n (Fig. 1). In general, their dorsal surface is dark gray, becoming lighter gray on the sides, with a white under-belly. The sounds they make when breathing have earned them the nickname “puffi ng pig.” This species is rarely active at the surface but instead presents a low profi le when surfacing and often travels alone (Leatherwood et al., 1982). They generally forage on small, pelagic schooling fish in waters less than 200 m (656 ft) deep (Bjørge and Tolley, 2008).