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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.
They are often called marine mammals. Dolphins and porpoises are small whales. There are around 80 different kinds or species of whales and dolphins. Whales can be divided into two groups: those with teeth, called toothed whales, and those without called baleen whales.