Preferred places of three threatened dolphin and porpoise species, only found in the Black Sea, named as Important Marine Mammal Areas
Harbor porpoise Washington Department of Fish & Wildlife
Bottlenose Dolphins & Harbour Porpoise Form An Unlikely Friendship While Swimming & Playing In The Waters Off Cornwall, England - World Animal News
Scientific literature - River Dolphins
Freshwater Dolphins and Porpoises - Marine Mammal Commission
Decorating the dolphin: why a marine mammal deserves the crown
Dolphin Species Goes Extinct Due to Humans
Marine Protected Areas for Whales, Dolphins and Porpoises: A World Handbook for Cetacean Habitat Conservation and Planning (Earthscan Oceans): Hoyt, Erich: 9781844077625: : Books
Whales, Dolphins and Porpoises Oregon Department of Fish & Wildlife
Vaquita porpoise: Extinction alert issued for critically endangered marine mammal
Extinction alert issued for vaquita porpoise, Environment News
How to rescue a beached dolphin, whale or porpoise - Reader's Digest
Only 10 vaquita porpoises are left, but hope remains for their survival
Whales, Dolphins and Porpoises Oregon Department of Fish & Wildlife