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  Dolphin Information

There are 56 informational link matches for 'Dolphin'.
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Dolphin
Dolphin
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More About Dolphins ...
Dolphins are certain aquatic mammals related to whales and porpoises.

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

any member of the family Delphinidae (oceanic dolphins),
any member of the families Delphinidae and Platanistoidae (oceanic and river dolphins),
any member of the suborder Odontoceti (toothed whales; these include the above families and some others),
laypeople often use the term synonymously with Bottlenose Dolphin, the most common and familiar species of dolphin.
In this encyclopedia, definition two is used.

Porpoises (suborder Odontoceti, family Phocoenidae) are thus not dolphins in our sense. Killer Whales 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 1.2 metres and 40 kg (Heaviside's Dolphin), up to 7 metres and 4.5 tonnes (the Killer Whale). Most species weigh between about 50 and about 200 kg. They are found worldwide, mostly in the shallower seas of the continental shelves, and all are carnivores, mostly taking 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.

Dolphins are widely believed to be amongst the most intelligent of all animals, although the difficulties and expense of doing experimental work with a large marine animal, with a very different sensory apparatus from our own, mean that many of the tests required to confirm this belief have not yet been done, or have been carried out with inadequate sample sizes and methodology. See the Dolphin intelligence article for more details.

Dolphins often leap above the water surface, sometimes performing acrobatic figures (e.g. the spinner dolphin). This and other behaviour is interpreted as playing. They are capable of diving up to 260 m deep and 15 min long, but rarely stay underwater longer than few minutes.
Frequently dolphins will accompany boats, riding the bow waves. They are also famous for their willingness to occasionally approach humans and interact with them in the water. In return, in some cultures like in Ancient Greece they were treated with welcome; a ship spotting dolphins riding in their wake was considered a good omen for a smooth voyage.

Dolphins are social animals, living in so called schools of up to a dozen animals. In places with high abundance of food, schools can join temporarily forming aggregations of over 1000 dolphins. The individuals communicate using a variety of klicks, whistles and other vocalizations. They also use ultrasonic sounds for echolocation.

Membership in schools is not rigid, interchange is common. However, the animals can establish strong bonds between each other. This leads to them staying with injured or ill fellows for support.

Dolphins are predators, chasing their prey at high speed. The dentition is adapted to the animals they hunt: Species with long beaks and many teeth forage on fish, whereas short beaks and lesser tooth count are linked to catching squid. Some dolphins may take crustaceans. Usually, the prey is swallowed as a whole. The bigger species are capable of eating marine mammals, especially the orca, which kills even large whales.
Taxonmony
Phylum: Chordata
Class: Mammalia
Order: Cetacea
Family: Delphinidae
Source: Wikipedia Read more about Dolphins
INFO LINKS
Bottlenose Dolphin
Searworld.Org
Interesting facts about dolphins like "they have been seen jumping as hight as 16 ft from the surface of the water" Read More
Amazon River Dolphin
Searworld.Org
This specieis is found in the Amazon and Onnoco river and it is considered a vulnerable species Read More
Dolphin
Whale and Dolphin Conservation Society
Oganization committed to the protection of whales, dolphins and their environments Read More
La Plata River Dolphin
The Wild Ones
These are also called franciscana Read More
Bottlenose Dolphin
National Geographic - Creature Feature Archive
Bottlenose Dolphin fun facts Read More
Amazon river dolphin
BBC Nature: Wildfacts
"As with most river dolphins, this species has poor eyesight and relies on echolocation to find prey in the muddy rivers that it inhabits" Categorized information on physical description, distribution, diet, behavior, consevation status, etc. Read More
Atlantic spotted dolphin
BBC Nature: Wildfacts
Atlantic spotted dolphin: Facts and Pictures Read More
Atlantic white-sided dolphin
BBC Nature: Wildfacts
Atlantic white-sided dolphin: Facts and Pictures Read More
Bottlenose dolphin
BBC Nature: Wildfacts
Bottlenose dolphin: Facts and Pictures Read More
Burmeister's porpoise
BBC Nature: Wildfacts
Burmeister's porpoise: Facts and Pictures Read More
Chilean dolphin
BBC Nature: Wildfacts
Chilean dolphin: Facts and Pictures Read More
Chinese river dolphin
BBC Nature: Wildfacts
Chinese river dolphin: Facts and Pictures Read More
Commerson's dolphin
BBC Nature: Wildfacts
Commerson's dolphin: Facts and Pictures Read More
Common dolphin
BBC Nature: Wildfacts
Common dolphin: Facts and Pictures Read More
Dall's porpoise
BBC Nature: Wildfacts
Dall's porpoise: Facts and Pictures Read More
Dusky dolphin
BBC Nature: Wildfacts
Dusky dolphin: Facts and Pictures Read More
Finless porpoise
BBC Nature: Wildfacts
Finless porpoise: Facts and Pictures Read More
Fraser's dolphin
BBC Nature: Wildfacts
Fraser's dolphin: Facts and Pictures Read More
Ganges river dolphin
BBC Nature: Wildfacts
Ganges river dolphin: Facts and Pictures Read More
Gulf porpoise
BBC Nature: Wildfacts
Gulf porpoise: Facts and Pictures Read More
Harbour porpoise
BBC Nature: Wildfacts
Harbour porpoise: Facts and Pictures Read More
Heaviside's dolphin
BBC Nature: Wildfacts
Heaviside's dolphin: Facts and Pictures Read More
Hector's dolphin
BBC Nature: Wildfacts
Hector's dolphin: Facts and Pictures Read More
Indo-Pacific hump-backed dolphin
BBC Nature: Wildfacts
Indo-Pacific hump-backed dolphin: Facts and Pictures Read More
Indus river dolphin
BBC Nature: Wildfacts
Indus river dolphin: Facts and Pictures Read More
La Plata dolphin
BBC Nature: Wildfacts
La Plata dolphin: Facts and Pictures Read More
Northern right whale dolphin
BBC Nature: Wildfacts
Northern right whale dolphin: Facts and Pictures Read More
Pacific white-sided dolphin
BBC Nature: Wildfacts
Pacific white-sided dolphin: Facts and Pictures Read More
Peale's dolphin
BBC Nature: Wildfacts
Peale's dolphin: Facts and Pictures Read More
Risso's dolphin
BBC Nature: Wildfacts
Risso's dolphin: Facts and Pictures Read More
Rough-toothed dolphin
BBC Nature: Wildfacts
Rough-toothed dolphin: Facts and Pictures Read More
Southern right whale dolphin
BBC Nature: Wildfacts
Southern right whale dolphin: Facts and Pictures Read More
Spectacled porpoise
BBC Nature: Wildfacts
Spectacled porpoise: Facts and Pictures Read More
Spinner dolphin
BBC Nature: Wildfacts
Spinner dolphin: Facts and Pictures Read More
Spotted dolphin
BBC Nature: Wildfacts
Spotted dolphin: Facts and Pictures Read More
Striped dolphin
BBC Nature: Wildfacts
Striped dolphin: Facts and Pictures Read More
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