Any member of the family Delphinidae, which includes dolphins, killer whales, and other toothed whales.
From Delphinidae (scientific family name) + -id (member of). Named from Greek delphin- (dolphin) in the 19th century when cetacean taxonomy was formalized.
Delphinids are so intelligent that they recognize themselves in mirrors, mourn their dead, and have complex cultures that vary by region—some dolphins hunt fish differently than others, like regional cuisines.
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