<P> Killer whales are found in all oceans and most seas . Due to their enormous range, numbers, and density, distributional estimates are difficult to compare, but they clearly prefer higher latitudes and coastal areas over pelagic environments . Areas which serve as major study sites for the species include the coasts of Iceland, Norway, the Valdes Peninsula of Argentina, the Crozet Islands, New Zealand and parts of the west coast of North America, from California to Alaska . </P> <P> Systematic surveys indicate the highest densities of killer whales (> 0.40 individuals per 100 km2) in the northeast Atlantic around the Norwegian coast, in the north Pacific along the Aleutian Islands, the Gulf of Alaska and in the Southern Ocean off much of the coast of Antarctica . They are considered "common" (0.20--0.40 individuals per 100 km2) in the eastern Pacific along the coasts of British Columbia, Washington and Oregon, in the North Atlantic Ocean around Iceland and the Faroe Islands . High densities have also been reported but not quantified in the western North Pacific around the Sea of Japan (from Rebun Island and vicinity in north to Primorsky Krai and Korean Peninsula in west, coasts of Honshu in east to Tsushima Strait and Kyushu) in south), Shiretoko Peninsula and off Kushiro (Resident and Transient groups began colonizing in these areas possibly after in 2000s), Sea of Okhotsk, Kuril Islands, Kamchatka and the Commander Islands and in the Southern Hemisphere off the coasts of South Australia, off the coast of northern to southern Brazil and the tip of southern Africa . They are reported as seasonally common in the Canadian Arctic, including Baffin Bay between Greenland and Nunavut, and around Tasmania and Macquarie Island . The northwest Atlantic population of at least 67 individuals ranges from Labrador and Newfoundland to New England with sightings to Cape Cod and Long Island . </P> <P> Information for offshore regions and warmer waters is more scarce, but widespread, if not frequent, sightings indicate the killer whale can survive in most water temperatures . They have been sighted, for example, in the Mediterranean, the Arabian Sea, the Gulf of Mexico and the Indian Ocean around the Seychelles . In the Mediterranean, killer whales are considered "visitors" with the exception of one small population which lives in the Strait of Gibraltar . Except for northeastern basins from Black Sea, records have been among almost entire basin including Aegean and Levantine basins such as off Israel . A distinct population may also exist in Papua New Guinea . Distributions and abundances in other Asian waters are very unclear, only with sightings time to time have been reported, such as off Phuket and Mergui Archipelago . </P> <P> Population structure in mid to lower latitudes of the North Pacific is unclear especially in coastal waters . Large concentrations are known to occur north of the Northern Mariana Islands and in the Gulf of Sendai, and repeated sightings are reported off Bali, the east coast of Taiwan, Ryukyu Islands, Izu Islands, in Tsushima Strait, and Izu Peninsula . The modern status of the species along coastal mainland China and its vicinity is unknown . Recorded sightings have been made from almost the entire shoreline; from Bohai and the Yellow Sea in the north to Ningbo and the Zhoushan Islands in the east and the Vietnam coast in the south . </P>

How long does a killer whale live for