Phocoena phocoena

Although commonly mistaken for each other, porpoises have flat spade-shaped teeth, a more triangular dorsal fin, and a rounder snout than dolphins. Harbor porpoises are less social than other species, with most pods containing fewer than ten individuals.

   Fish, octopus, and squid make up the diet of this active swimmer. Averaging 130 lbs (60 kg), harbor porpoise may consume 10 percent of their body weight daily. Harbor porpoise typically live only 8-10 years, although they may live up to 20. Their predators include sharks, orca, and in some places, humans.