Physical Statistics: Harbor porpoise are the smallest cetacean species found in this area, reaching only 4-5 feet in length and weighing up to 140 pounds.

Field Marks: Harbor porpoise are the only true porpoise in the North Atlantic. Unlike dolphins, porpoise do not have a pronounced beak. The head tends to be rounder in shape and instead of having conical teeth, the teeth are flat. Harbor porpoise have a very small dorsal fin that is triangular in shape. A pale "wash" of gray can be seen forward of the dorsal fin on both sides of the body which blends into a uniform coloration further back. Like fin whales, harbor porpoise are asymmetrical in coloration, the "wash" less distinctive on one side of the body. Harbor porpoise generally take 4-5 breaths and make short dives, often diving as a group. Pods in this area range from as small as 2-3 animals to about 20, although larger pods have been observed.

Individual Identification: Aside from any scarring on the body, individual identification is difficult. Due to their skittish nature, it is almost impossible to attain a good photograph of a harbor porpoise in the wild (hence our "wonderful" photograph above).