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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 17 different whale species (including dolphins and porpoises) in the Arctic. 1  Some of these live in the Arctic all year round, such as the narwhal and beluga, and some, such as the humpback whale and gray whale, migrate to the cooler Arctic waters during the northern summer to give birth.