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Dolphin Whale Ocean Fauna Marine Life Souvenir Sheet of 2 Stamps Mint NH Soccer Guiné-Bissau Wild Horses Brown MustangsChad Dolphin Whale Ocean Fauna Marine Life Souvenir Sheet of 2 Stamps Mint NH Dolphins are a widely distributed and diverse group of aquatic mammals. They are an informal grouping within the order Cetacea, excluding whales and porpoises, so to zoologists the grouping is paraphyletic. The dolphins comprise the extant families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the new world river dolphins), and