beak. Their flippers are positioned at the front of the body and a triangular dorsal fin sits mid-body. Patterns of coloration are highly variable, but Dall's porpoises are mostly black, have white to grey patches on the flank and belly, and frosting on the dorsal fin and trailing edge of the fluke.

They are the largest living porpoise species, growing up to 2.3 m in length and weighing 130-220 kg. Sexual dimorphism is apparent in body size and shape, with mature males being larger, developing