Dolphins are a widely distributed and diverse group of fully aquatic
marine mammals. They are an informal grouping within the order Cetacea,
excluding whales and porpoises, so to zoologists the grouping is paraphy
letic. There are 40 extant species of dolphins. Dolphins, alongside other
cetaceans, belong to the clade Cetartiodactyla with even-toed ungulates,
and their closest living relatives are the hippopotamuses, having diverged
about 40 million years ago.
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