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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.
Six species of baleen whales are found in Antarctica, including the huge blue whale which is the largest animal that has ever lived. It grows up to 24 metres and can weigh 84 tonnes. Other baleen species are the fin, southern right whale, sei, minke and humpback. Four species of toothed whales are found in Antarctica. Except for the sperm whale, they are much smaller than the baleen whales and weren't widely hunted. The other species are the southern bottlenose whale, the orca whale and the southern fourtooth whale.