A porpoise found widely in coastal and offshore waters of the North Pacific, including around Japan. Its markings vary by region and life stage.
It has a dark body with white markings, a small head and a robust build. Its pattern varies by region and life stage.
It often feeds at night on small fish and squid and sometimes eats crustaceans. It surfaces briskly while swimming.
An extinction-risk assessment has not been added yet.