A dolphin is a common name used for some of the aquatic mammals in the
cetacean clade Odontoceti, the toothed whales. Dolphins belong to the
families Delphinidae (the oceanic dolphins), along with the river
dolphin families Platanistidae (the Indian river dolphins), Iniidae (the
New World river dolphins), Pontoporiidae (the brackish dolphins), and
probably extinct Lipotidae (baiji or Chinese river dolphin).
There are 36 species of marine dolphins - living in nearly all aquatic
environments, including oceans, coastal, estuarine and freshwater - and
in temperatures ranging from less than 0°C to more than 30°C. In
Britain, bottlenose dolphins are concentrated around west Wales and
eastern Scotland - with the coasts of Devon and Cornwall also having
pods. Scotland is home to the most northerly pod of bottlenose dolphins
in the world.
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