Whale is the common name for various marine mammals of the order Cetacea. The term whale sometimes refers to all cetaceans, but more often it excludes dolphins and porpoises, which belong to the suborder Odontoceti. This suborder also includes the sperm whale, killer whale, pilot whale, and beluga whale. The other Cetacean suborder, Mysticeti, comprises filter feeders that eat small organisms caught by straining seawater through a comblike structure found in the mouth called baleen.
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Whales belong in the ocean, right? That may be true today, but cetaceans (whales, dolphins, porpoises) actually descended ...