海豚..............

Dolphins are aquatic mammals which are closely related to whales and porpoises. There are almost forty species of dolphin in seventeen genera. They vary in size from 1.2 metres (4 ft) and 40 kilograms (88 lb) (Maui's Dolphin), up to 9.5 m (30 ft) and ten tonnes (the Orca). They are found worldwide, mostly in the shallower seas of the continental shelves, and are carnivores, mostly eating fish and squid. The family Delphinidae is the largest in the Cetacea, and relatively recent: dolphins evolved about ten million years ago, during the Miocene. Dolphins are considered to be amongst the most intelligent of animals and their often friendly appearance and seemingly playful attitude have made them popular in human culture.





Contents[hide]

1 Origin of the name
2 Taxonomy

2.1 Hybrid dolphins
3 Evolution and anatomy

3.1 Evolution
3.2 Anatomy
3.3 Senses
4 Behaviour

4.1 Social behaviour
4.2 Feeding
4.3 Jumping and playing
5 Human-dolphin relationships

5.1 Mythology
5.2 Therapy
5.3 Entertainment
5.4 Military
5.5 Literature
6 Human threats to dolphins

6.1 2007: Year of the Dolphin
7 References
8 External links http://en.wikipedia.org/wiki/Dolphin

Cetaceans

There are 81 currently recognized species of cetaceans ­ whales, dolphins, and porpoises. Cetaceans are mammals, meaning they have hair (though you might have a hard time finding it), bear live young and suckle them, are warm-blooded, and breathe air with lungs.

While people divide cetaceans into whales, dolphins, porpoises, and blackfish according to size and superficial resemblances, the most important scientific distinction is between the suborders Mysticeti (baleen whales) and Odontoceti (toothed whales). All dolphins and porpoises are odontocetes, though they belong to a number of different families: Delphinidae (oceanic dolphins), Iniidae (Amazon River dolphins), Pontoporiidae (Baiji and Franciscana dolphins), Platanistidae (Indus and Ganges River dolphins), and Phocoenidae (porpoises). These families are further divided into genera and species.

Sousa chinensis

Sousa chinensis, or the Indo-Pacific Humpback Dolphin, is a coastal dolphin found from South Africa to China and northern Australia. Compared with other species of dolphin, it is not very well studied. Sources differ on basic facts, such as colouration, and whether or not they're found in the Philippines. In fact, until recently they were considered to be several different species

我中六果陣做過一個海豚ge研究
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2007-05-03 17:00:13 補充：
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