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There are about 86 species of whales, dolphins and porpoises in the Order Cetacea, which is further divided into two sub-orders, the Odontocetes, or toothed whales and the Mysticetes, or baleen whales. Cetaceans can differ greatly in their appearance, distribution, and behavior.
There are about 65 different species of toothed whales. Toothed whales, including all dolphins and porpoises, have teeth, only one blowhole (baleen whales have two) and are generally smaller than most baleen whales. The only toothed whale longer than 13 metres is the sperm whale (they can measure up to 18 metres). Toothed whales are hunters.