| American Cetacean Society Fact Sheet - Harbor Porpoise Fact sheet with description of fins and fluke. | |
| Differences between Dolphins and Porpoises Chart illustrating the differences between dolphins and porpoises. | |
| Discovery of Sound in the Sea - Harbor Porpoise Photos and multimedia with audio. | |
| Harbor Porpoise on the Move! Has a great video of a harbor porpoise in action. | |
| Hebridean Whale and Dolphin Trust - Harbor Porpoise Detailed physical description, habitat, distribution, behavior, food and conservation status. | |
| Museum of Zoology -- Animal Diversity Web -- University of Michigan -- Harbor Porpoise Fact sheet, focus on conservation status. | |
| NOAA -- Harbor Porpoise Fact sheet with good links to other websites. | |
| YouTube video -- Harbor Porpoise Video of porpoise breathing at the surface. |