Whale (origin Old English hƿæl) is the common name for various marine mammals of the order Cetacea.[2] The term whale is sometimes used to refer to all cetaceans, but more often it excludes dolphins and porpoises, which are also cetaceans[3] but belong to the suborder Odontoceti (toothed whales). This suborder also includes the sperm whale, killer whale, pilot whale, and beluga whale. The suborder Mysticeti (baleen whales), are filter feeders that feed on small organisms caught by straining seawater through a comblike structure found in the mouth called baleen. This suborder includes the blue whale, the humpback whale the bowhead whale and the minke whales. All Cetacea have forelimbs modified as fins, a tail with horizontal flukes, and nasal openings on top of the head. Text taken from Wikipedia article on Whale.

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