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Dolphins
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 paraphyletic.
Elephants
Elephants are large mammals of the family Elephantidae and the order Proboscidea. Two species are traditionally recognized, the African elephant and the Asian elephant, although some evidence suggests that African bush elephants and African forest elephants are separate species.