Dolphins are cetacean
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 and 40 kg, up to 9.5 m and 10 tonnes (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 order Cetacea, evolved relatively recently, about ten million years ago
during the Miocene. Source
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