The porpoises are small cetaceans of the family Phocoenidae; they are related to whales and dolphins. They are however distinct from dolphins, although the word "porpoise" is often used to refer to any small dolphin, especially in North America. A key difference is the shape of the teeth and of the head.
Porpoises, divided into six species, live in all oceans, mostly near the shore. Probably best known is the Harbour Porpoise, which can be found across the Northern Hemisphere.

All About Dolphins: Index of Questions - Observe dolphins in their natural habitat with expert research biologists.
Meta Description: [ Observe dolphins in their natural habitat with expert research biologists ]
All You Need to Know About Dolphins - Basic information and pictures about several types of dolphins.
Bottlenose Dolphin - Includes information about the habitat, life span, diet, and size of the bottlenose dolphin.
Common Dolphin ACS Cetacean Fact Sheet - Information a dolphin's physical descriptions, typical weight and length, and mating habits.
Meta Description: [ ACS common dolphin fact sheet - concise, scientifically reviewed basic information on the common dolphin, including physical description, prey, range, and status, from the American Cetacean Society ]
Dolphin's World - Pictures, animations, facts, games and coloring books about all varieties of dolphin.
Dolphins - Includes information on the different types of dolphins, fun facts, dolphin behavior, and a photo gallery.
Meta Description: [ Lots of facts and photos of the Dolphins ]
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My Dolphin Facts - Anatomy, reproduction, surfacing, diet, size, swimming speed, life span, sleeping, and traveling characteristics of the dolphin.
Nature: Wisdom of the Wild - Dolphin Dichotomy - Find out how dolphins can actually help humans through the process of 'dolphin healing.'
Spinner Dolphins - Contains anatomy, behavior, and research on dolphins.
Meta Description: [ Hawaiian spinner dolphin behaviors, pictures, video, information, volunteer ]
The Dolphin Institute - Dedicated to dolphins and whales through education, research, and conservation. Browse an educational area to learn about marine mammals. Offers student internships for those interested.
Meta Description: [ The Dolphin Institute and the Kewalo Basin Marine Mammal Laboratory: Dedicated to Dolphins and Whales through Education, Research, and Conservation. Over 20 years Dolphin Research and Humpback Whale Research, based in Honolulu, Hawaii. Browse our extensive educational area to learn about marine m... ]
Whale Songs: The Common Dolphin - Discovered in 1758, the dolphin has been a species known to most who know anything about the sea. Learn more about this creature, including the habitat it lives in, its life cycle, and behavior.
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