DOLPHIN is a toothed WHALE belonging to the family Delphinidae. The largest species is the KILLER WHALE, or orca. Smaller species are distinguished by long, slender bodies, beaks clearly demarcated from their foreheads, and usually a prominent dorsal fin. Dolphins are highly social animals; some species congregate in groups of up to a thousand or more individuals. They may leap playfully and ride the bow waves of vessels. They use an elaborate echolocation system to manoeuvre through the water...

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