DOLPHIN
دلفين are marine
mammals closely related to whales and porpoises. There are almost forty species of dolphin in 17 genera. They vary in size from 1.2 m (4 ft) and
40 kg (90 lb) (Maui's
dolphin), up to 9.5 m (30 ft) and 10 tonnes (9.8
long tons; 11 short tons) (the orca or killer whale). They
are found worldwide, mostly in the shallower seas of the continental shelves and are carnivores, eating mostly fish and squid. The family Delphinidae, the largest in the Cetacean order, evolved
relatively recently, about ten million years ago during the Miocene. Dolphins frequently leap above the water surface, this
being done for various reasons. When travelling, jumping can save the dolphin
energy as there is less friction while in the air. This type of travel is
known as porpoising. Other
reasons include orientation, social displays, fighting, non-verbal communication, entertainment and attempting to dislodge parasites.
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