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Killer Whale largest member of the dolphin family Killer whales occur in more parts of the world than probably any other cetacean see Whale They occur in all oceans both in the open ocean and close to shore but are more common in the colder more productive waters of both hemispheres than in the Tropics Resident populations may cover an area of several hundred square kilometers Transient populations often move through an area rapidly swimming more than 1000 km more than 600 mi along a shoreline in a matter of days Killer whales are black or deep brown overall with striking white patches above the eye and from the lower jaw to the belly and a fainter grayish-white saddle patch just under and behind the dorsal fin Males are somewhat larger than females with mature females reaching lengths of up to 85 m up to 28 ft and mature males reaching lengths of up to 98 m up to 32 ft All killer whales have a prominent triangular dorsal fin in the middle of the back but that of the adult male may grow to 18 m 59 ft tall The flippers of both sexes are large and oval unlike those of any other toothed whale Killer whales may be solitary or live in groups of 2 to more than 50 animals They feed on fish squid marine birds pinnipeds see Seal and even other cetaceans They generally cooperate during hunting especially when feeding on large warm-blooded animals such as penguins seals and porpoises Killer whales have even been known to prey on blue whales the largest species on earth In most areas killer whales have specialized feeding habits In the Pacific Northwest of the United States and the Pacific Provinces of Canada for example resident populations feed mainly on salmon and other near-shore fishes while transient populations feed primarily on harbor seals and porpoises In several places in the southern hemisphere they
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