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Free Dolphin Mammal Pictures
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Fish

Mammals

Dolphin Information and Characteristics Courtesy of
Wikipedia, the free encyclopedia

This article is about the dolphin mammal. It is confusing because the name is applied to both fish and mammals. For the fish, see http://fishingsociety.org/DolphinFpics.html .

Dolphins are aquatic mammals related to whales and porpoises. The name is from Ancient Greek delphis meaning "with a womb", viz. "a 'fish' with a womb".

The word is used in a few different ways. It can mean:

1. any member of the family Delphinidae (oceanic dolphins),

2. any member of the families Delphinidae and Platanistoidae (oceanic and river dolphins),

3. any member of the suborder Odontoceti (toothed whales; these include the above families and some others),

4. laypeople often use the term synonymously with Bottlenose Dolphin, the most common and familiar species of dolphin. In this article, the second definition is used. Porpoises (suborder Odontoceti, family Phocoenidae) are thus not dolphins in our sense. Orcas and some related species belong to the Delphinidae family and therefore qualify as dolphins, even though they are called whales in common language.

There are almost 40 species of dolphin in 17 genera. They vary in size from 4 ft (1.2 m) and 88 lb (40 kg) (Maui's Dolphin), up to 31 ft (9.5 m) and 10 tonnes (the Orca). Most species weigh about 110 to 440 lb (50 to 200 kg). They are found worldwide, mostly in the shallower seas of the continental shelves, and all are carnivores, mostly eating fish and squid.

The family Delphinidae is the largest in the Cetacea, and relatively recent: dolphins evolved about 10 million years ago, during the Miocene.

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