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Dolphins 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 is the largest in the Cetacean order, and evolved relatively recently, about ten million years ago, during the Miocene. Dolphins are among the most intelligent animals, and their often friendly appearance, an artifact of the "smile" of their mouthline, and seemingly playful attitude have made them very popular in human culture.
The pink dolphin, more commonly known as the pink dolphin of the Amazon or the Boto , is a marine mammal of the family Odontocetes (cetaceans that have teeth and not baleen). Scientists even consider him from the family of platanistids. Its particularity, apart from its pink color , is that it is a freshwater dolphin that lives mainly in the river.
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