Harbor Porpoise: Until the end of the 19th century, these porpoises were hunted in Denmark for meat and blubber. In prehistoric times, it was hunted in Sweden. Today, it is hunted for food and Greenland. Fishing nets, overfishing, and pollution are the biggest threat to this species. Fortunately, it is listed as Least Concern on the IUNC Red List.
Dall's Porpoise: Many of these species are killed as bycatches in fishing nets. They are harpooned each year by Japanese whalers. The number of species killed in 1988 was 40,000. Today, 16,000 are still killed in Japan in hand harpoon hunts, but it is listed as Least Concern on IUNC Red List.
Vaquita: This species has never been hunted directly. Many are killed in fishing nets each year though. They are said to be the most endangered marine mammal, and is listed as Critically Endangered on the IUNC Red List.