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Killer whale[1]
Temporal range: Pliocene to recent[2]
Two killer whales jump above the sea surface, showing their black, white and grey colouration. The closer whale is upright and viewed from the side, while the other whale is arching backward to display its underside.
Transient orcas near Unimak Island, eastern Aleutian Islands, Alaska
Diagram showing a killer whale and scuba diver from the side: The whale is about four times longer than a human, who is roughly as long as the whale's dorsal fin.
Size compared to a 1.80-metre (5 ft 11 in) human

Data Deficient (IUCN 3.1)[3]
CITES Appendix II (CITES)[4]
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Infraorder: Cetacea
Family: Delphinidae
Genus: Orcinus
O. orca
Binomial name
Orcinus orca
A world map shows killer whales are found throughout every ocean, except parts of the Arctic. They are also absent from the Black and Baltic seas.
  Orcinus orca range
  • Delphinus orca Linnaeus, 1758
  • Delphinus gladiator Bonnaterre, 1789
  • Orca gladiator (Bonnaterre, 1789)

The orca or killer whale (Orcinus orca) is a

cosmopolitan species, orcas can be found in all of the world's oceans in a variety of marine environments, from Arctic and Antarctic regions
to tropical seas.

Orcas have a diverse diet, although individual populations often specialize in particular types of prey. Some feed exclusively on fish, while others hunt

matrilineal family groups (pods) which are the most stable of any animal species. Their sophisticated hunting techniques and vocal behaviours, which are often specific to a particular group and passed across generations, have been described as manifestations of animal culture


U.S. Endangered Species list

Wild orcas are not considered a threat to humans, and no fatal attack on humans has ever been documented. There have been cases of

captive orcas killing or injuring their handlers
at marine theme parks. Orcas feature strongly in the mythologies of indigenous cultures, and their reputation in different cultures ranges from being the souls of humans to merciless killers.


Orcas are commonly referred to as "killer whales", despite being a type of dolphin.[6] Since the 1960s, the use of "orca" instead of "killer whale" has steadily grown in common use.[7]

The genus name Orcinus means "of the kingdom of the dead",

Delphinidae, the species is more closely related to other oceanic dolphins than to other whales.[12]

They are sometimes referred to as "blackfish", a name also used for other whale species. "Grampus" is a former name for the species, but is now seldom used. This meaning of "grampus" should not be confused with the genus Grampus, whose only member is Risso's dolphin.[13]


Modern orca skeleton, Naturalis
, Leiden

Orcinus orca is the only recognized

stranded animal in the Bay of Greifswald that had attracted a great deal of local interest.[15]

The orca is one of 35 species in the

sister taxon to the Lissodelphininae, a clade that includes Lagenorhynchus and Cephalorhynchus.[18] In contrast, a 2019 phylogenetic study found the orca to be the second most basal member of the Delphinidae, with only the Atlantic white-sided dolphin (Leucopleurus acutus) being more basal.[19]


The three to five types of orcas may be distinct enough to be considered different

IUCN reported in 2008, "The taxonomy of this genus is clearly in need of review, and it is likely that O. orca will be split into a number of different species or at least subspecies over the next few years."[3] Although large variation in the ecological distinctiveness of different orca groups complicate simple differentiation into types,[22] research off the west coast of North America has identified fish-eating "residents", mammal-eating "transients" and "offshores".[23] Other populations have not been as well studied, although specialized fish and mammal eating orcas have been distinguished elsewhere.[24] Mammal-eating orcas in different regions were long thought likely to be closely related, but genetic testing has refuted this hypothesis.[25]

Four types have been documented in the Antarctic, Types A–D. Two dwarf species, named Orcinus nanus and Orcinus glacialis, were described during the 1980s by Soviet researchers, but most cetacean researchers are skeptical about their status.[21] Complete mitochondrial sequencing indicates the two Antarctic groups (types B and C) should be recognized as distinct species, as should the North Pacific transients, leaving the others as subspecies pending additional data.[26] A 2019 study of Type D orcas also found them to be distinct from other populations and possibly even a unique species.[27]


Orcas are the largest extant members of the dolphin family. Males typically range from 6 to 8 metres (20 to 26 ft) long and weigh in excess of 6 tonnes (5.9 long tons; 6.6 short tons). However, the largest recorded specimen measured 9.8 metres (32 ft) and weighed more than 10 tonnes (9.8 long tons; 11 short tons).[28] Females are smaller, generally ranging from 5 to 7 m (16 to 23 ft) and weighing about 3 to 4 tonnes (3.0 to 3.9 long tons; 3.3 to 4.4 short tons).[29] Calves at birth weigh about 180 kg (400 lb) and are about 2.4 m (7.9 ft) long.[30][31] The skeleton of the orca is typical for an oceanic dolphin, but more robust.[32]

With their distinctive pigmentation,

melanistic orcas have been documented.[32]


pectoral fins are large and rounded, resembling paddles, with those of males significantly larger than those of females. Dorsal fins also exhibit sexual dimorphism, with those of males about 1.8 m (5.9 ft) high, more than twice the size of the female's, with the male's fin more like a tall, elongated isosceles triangle, whereas the female's is shorter and more curved.[37] In the skull, adult males have longer lower jaws than females, as well as larger occipital crests.[38] The snout is blunt and lacks the beak of other species.[32] The orca's teeth are very strong, and its jaws exert a powerful grip; the upper teeth fall into the gaps between the lower teeth when the mouth is closed. The firm middle and back teeth hold prey in place, while the front teeth are inclined slightly forward and outward to protect them from powerful jerking movements.[39]

Orcas have good eyesight above and below the water, excellent hearing, and a good sense of touch. They have exceptionally sophisticated echolocation abilities, detecting the location and characteristics of prey and other objects in the water by emitting clicks and listening for echoes,[40] as do other members of the dolphin family. The mean body temperature of the orca is 36 to 38 °C (97 to 100 °F).[41][42] Like most marine mammals, orcas have a layer of insulating blubber ranging from 7.6 to 10 cm (3.0 to 3.9 in) thick beneath the skin.[41] The pulse is about 60 heartbeats per minute when the orca is at the surface, dropping to 30 beats/min when submerged.[43]

An individual orca can often be identified from its dorsal fin and saddle patch. Variations such as nicks, scratches, and tears on the dorsal fin and the pattern of white or grey in the saddle patch are unique. Published directories contain identifying photographs and names for hundreds of North Pacific animals. Photographic identification has enabled the local population of orcas to be counted each year rather than estimated, and has enabled great insight into life cycles and social structures.[44]

Range and habitat

A killer whale bursts forward out of the water. Its head is just starting to point downward, and is about a body width above the surface.
An orca leaps out of the water when swimming—a behaviour known as porpoising—in Hood Canal

Orcas are found in all oceans and most seas. Due to their enormous range, numbers, and density, relative distribution is difficult to estimate,[45] but they clearly prefer higher latitudes and coastal areas over pelagic environments.[46] 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.[47] Systematic surveys indicate the highest densities of orcas (>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.[45]

In the Antarctic, orcas range up to the edge of the

Migration patterns are poorly understood. Each summer, the same individuals appear off the coasts of British Columbia and Washington. Despite decades of research, where these animals go for the rest of the year remains unknown. Transient pods have been sighted from southern Alaska to central California.[51]


Worldwide population estimates are uncertain, but recent consensus suggests a minimum of 50,000 (2006).[52][3][53] Local estimates include roughly 25,000 in the Antarctic, 8,500 in the tropical Pacific, 2,250–2,700 off the cooler northeast Pacific and 500–1,500 off Norway.[54] Japan's Fisheries Agency estimated in the 2000s that 2,321 orcas were in the seas around Japan.[55][56]


Resident orca pursuing a chinook

Orcas are

sea turtles.[58] Different populations or ecotypes may specialize, and some can have a dramatic impact on prey species.[59] However, whales in tropical areas appear to have more generalized diets due to lower food productivity.[60][61] Orcas spend most of their time at shallow depths,[62] but occasionally dive several hundred metres depending on their prey.[63][64]


Fish-eating orcas prey on around 30 species of fish. Some populations in the Norwegian and Greenland sea specialize in herring and follow that fish's autumnal migration to the Norwegian coast. Salmon account for 96% of northeast Pacific residents' diet, including 65% of large, fatty Chinook.[65] Chum salmon are also eaten, but smaller sockeye and pink salmon are not a significant food item. Depletion of specific prey species in an area is, therefore, cause for concern for local populations, despite the high diversity of prey.[52] On average, an orca eats 227 kilograms (500 lb) each day.[66] While salmon are usually hunted by an individual whale or a small group, herring are often caught using carousel feeding: the orcas force the herring into a tight ball by releasing bursts of bubbles or flashing their white undersides. They then slap the ball with their tail flukes, stunning or killing up to 15 fish at a time, then eating them one by one. Carousel feeding has only been documented in the Norwegian orca population, as well as some oceanic dolphin species.[67]

In New Zealand,

shortfin makos.[68][69] With sharks, orcas may herd them to the surface and strike them with their tail flukes,[68] while bottom-dwelling rays are cornered, pinned to the ground and taken to the surface.[70] In other parts of the world, orcas have preyed on broadnose sevengill sharks,[71] small whale sharks[72] and even great white sharks.[71][73] Competition between orcas and white sharks is probable in regions where their diets overlap.[74] The arrival of orcas in an area can cause white sharks to flee and forage elsewhere.[75][76] Orcas appear to target the liver of sharks.[71][73]

Mammals and birds

Orcas are sophisticated and effective predators of marine mammals. They are recorded to prey on other cetacean species, usually smaller dolphins and porpoises such as common dolphins, bottlenose dolphins, Pacific white-sided dolphins, dusky dolphins, harbour porpoises and Dall's porpoises.[77][35] While hunting these species, orcas usually have to chase them to exhaustion. For highly social species, orca pods try to separate an individual from its group. Larger groups have a better chance of preventing their prey from escaping, which is killed by being thrown around, rammed and jumped on. Arctic orcas may attack beluga whales and narwhals stuck in pools enclosed by sea ice, the former are also driven into shallower water where juveniles are grabbed.[77] By contrast, orcas appear to be wary of pilot whales, which have been recorded to mob and chase them.[78]

Orcas also prey on larger species such as

grey whales and humpback whales.[77] In 2019, orcas were recorded to have killed a blue whale on three separate occasions off the south coast of Western Australia, including an estimated 18–22-meter (59–72 ft) individual.[79] Large whales require much effort and coordination to kill and orcas often target calves. A hunt begins with a chase followed by a violent attack on the exhausted prey. Large whales often show signs of orca attack via tooth rake marks.[77] Pods of female sperm whales sometimes protect themselves by forming a protective circle around their calves with their flukes facing outwards, using them to repel the attackers.[80] There is also evidence that humpback whales will defend against or mob orcas who are attacking either humpback calves or juveniles as well as members of other species.[81]

Prior to the advent of industrial whaling, great whales may have been the major food source for orcas. The introduction of modern whaling techniques may have aided orcas by the sound of exploding harpoons indicating the availability of prey to scavenge, and compressed air inflation of whale carcasses causing them to float, thus exposing them to scavenging. However, the devastation of great whale populations by unfettered whaling has possibly reduced their availability for orcas, and caused them to expand their consumption of smaller marine mammals, thus contributing to the decline of these as well.[82]

Orca beaching to capture sea lion along Valdes Peninsula

Other marine mammal prey includes

beaching temporarily to grab prey before wriggling back to the sea. Beaching, usually fatal to cetaceans, is not an instinctive behaviour, and can require years of practice for the young.[84] Orcas can then release the animal near juvenile whales, allowing the younger whales to practice the difficult capture technique on the now-weakened prey.[83][85] "Wave-hunting" orcas "spy-hop" to locate Weddell seals, crabeater seals and leopard seals resting on ice floes, and then swim in groups to create waves that wash over the floe. This washes the prey into the water, where other orcas lie in wait.[86][87][88]

In the

cannibalism has also been reported based on analysis of stomach contents, but this is likely to be the result of scavenging remains dumped by whalers.[95] One orca was also attacked by its companions after being shot.[24] Although resident orcas have never been observed to eat other marine mammals, they occasionally harass and kill porpoises and seals for no apparent reason.[96]

Orcas do consume seabirds but are more likely to kill and leave them uneaten. Penguin species recorded as prey in Antarctic and sub-Antarctic waters include gentoo penguins, chinstrap penguins, king penguins and rockhopper penguins.[97] Orcas in many areas may prey on cormorants and gulls.[98] A captive orca at Marineland of Canada discovered it could regurgitate fish onto the surface, attracting sea gulls, and then eat the birds. Four others then learned to copy the behaviour.[99]


, often lifting their entire bodies out of the water.

Day-to-day orca behaviour generally consists of

Spyhopping is a behaviour in which a whale holds its head above water to view its surroundings.[100] Resident orcas swim alongside porpoises and other dolphins.[101]

Social structure

Orcas are notable for their complex societies. Only

Resident orcas in the eastern North Pacific live in particularly complex and stable social groups. Unlike any other known mammal social structure, resident whales live with their mothers for their entire lives. These family groups are based on

Luna, no permanent separation of an individual from a resident matriline has been recorded.[104]

A pair of orcas in the Pacific Northwest

Closely related matrilines form loose aggregations called pods, usually consisting of one to four matrilines. Unlike matrilines, pods may separate for weeks or months at a time.[104] DNA testing indicates resident males nearly always mate with females from other pods.[105] Clans, the next level of resident social structure, are composed of pods with similar dialects, and common but older maternal heritage. Clan ranges overlap, mingling pods from different clans.[104] The highest association layer is the community, which consists of pods that regularly associate with each other but share no maternal relations or dialects.[106]

Transient pods are smaller than resident pods, typically consisting of an adult female and one or two of her offspring. Males typically maintain stronger relationships with their mothers than other females. These bonds can extend well into adulthood. Unlike residents, extended or permanent separation of transient offspring from natal matrilines is common, with juveniles and adults of both sexes participating. Some males become "rovers" and do not form long-term associations, occasionally joining groups that contain reproductive females.[107] As in resident clans, transient community members share an acoustic repertoire, although regional differences in vocalizations have been noted.[108]

As with residents and transients, the lifestyle of these whales appears to reflect their diet; fish-eating orcas off Norway have resident-like social structures, while mammal-eating orcas in Argentina and the Crozet Islands behave more like transients.[109]

Orcas of the same sex and age group may engage in physical contact and synchronous surfacing. These behaviours do not occur randomly among individuals in a pod, providing evidence of "friendships".[110][111]


Multimedia relating to the orca

Like all

cetaceans, orcas depend heavily on underwater sound for orientation, feeding, and communication. They produce three categories of sounds: clicks, whistles, and pulsed calls. Clicks are believed to be used primarily for navigation and discriminating prey and other objects in the surrounding environment, but are also commonly heard during social interactions.[53]

Northeast Pacific resident groups tend to be much more vocal than transient groups in the same waters.[112] Residents feed primarily on Chinook and chum salmon, which are insensitive to orca calls (inferred from the audiogram of Atlantic salmon). In contrast, the marine mammal prey of transients hear whale calls well and thus transients are typically silent.[112] Vocal behaviour in these whales is mainly limited to surfacing activities and milling (slow swimming with no apparent direction) after a kill.[113]

All members of a resident pod use similar calls, known collectively as a dialect. Dialects are composed of specific numbers and types of discrete, repetitive calls. They are complex and stable over time.[114] Call patterns and structure are distinctive within matrilines.[115] Newborns produce calls similar to their mothers, but have a more limited repertoire.[108] Individuals likely learn their dialect through contact with pod members.[116] Family-specific calls have been observed more frequently in the days following a calf's birth, which may help the calf learn them.[117] Dialects are probably an important means of maintaining group identity and cohesiveness. Similarity in dialects likely reflects the degree of relatedness between pods, with variation growing over time.[118] When pods meet, dominant call types decrease and subset call types increase. The use of both call types is called biphonation. The increased subset call types may be the distinguishing factor between pods and inter-pod relations.[115]

Dialects also distinguish types. Resident dialects contain seven to 17 (mean = 11) distinctive call types. All members of the North American west coast transient community express the same basic dialect, although minor regional variation in call types is evident. Preliminary research indicates offshore orcas have group-specific dialects unlike those of residents and transients.[118]

Norwegian and Icelandic herring-eating orcas appear to have different vocalizations for activities like hunting.[119] A population that live in McMurdo Sound, Antarctica have 28 complex burst-pulse and whistle calls.[120]


Orcas have the second-heaviest brains among marine mammals[121] (after sperm whales, which have the largest brain of any animal).[122] They can be trained in captivity and are often described as intelligent,[123][124] although defining and measuring "intelligence" is difficult in a species whose environment and behavioural strategies are very different from those of humans.[124] Orcas imitate others, and seem to deliberately teach skills to their kin. Off the Crozet Islands, mothers push their calves onto the beach, waiting to pull the youngster back if needed.[83][85] In March 2023, a female orca was spotted with a newborn pilot whale in Snæfellsnes.[125]

People who have interacted closely with orcas offer numerous anecdotes demonstrating the whales' curiosity, playfulness, and ability to solve problems. Alaskan orcas have not only learned how to steal fish from longlines, but have also overcome a variety of techniques designed to stop them, such as the use of unbaited lines as decoys.[126] Once, fishermen placed their boats several miles apart, taking turns retrieving small amounts of their catch, in the hope that the whales would not have enough time to move between boats to steal the catch as it was being retrieved. The tactic worked initially, but the orcas figured it out quickly and split into groups.[126]

In other anecdotes, researchers describe incidents in which wild orcas playfully tease humans by repeatedly moving objects the humans are trying to reach,[127] or suddenly start to toss around a chunk of ice after a human throws a snowball.[128]

The orca's use of dialects and the passing of other learned behaviours from generation to generation have been described as a form of animal culture.[129]

The complex and stable vocal and behavioural cultures of sympatric groups of killer whales (Orcinus orca) appear to have no parallel outside humans and represent an independent evolution of cultural faculties.[130]

Life cycle

Adult female orca with calf near South Georgia

Female orcas begin to mature at around the age of 10 and reach peak fertility around 20,

polyestrous cycling separated by non-cycling periods of three to 16 months. Females can often breed until age 40, followed by a rapid decrease in fertility.[131] Orcas are among the few animals that undergo menopause and live for decades after they have finished breeding.[132][133] The lifespans of wild females average 50 to 80 years.[134] Some are claimed to have lived substantially longer: Granny (J2) was estimated by some researchers to have been as old as 105 years at the time of her death, though a biopsy sample indicated her age as 65 to 80 years.[135][136][137] It is thought that orcas held in captivity tend to have shorter lives than those in the wild, although this is subject to scientific debate.[134][138][139]

Males mate with females from other pods, which prevents

Gestation varies from 15 to 18 months. [140] Mothers usually calve a single offspring about once every five years. In resident pods, births occur at any time of year, although winter is the most common. Mortality is extremely high during the first seven months of life, when 37–50% of all calves die.[141] Weaning begins at about 12 months of age, and is complete by two years. According to observations in several regions, all male and female pod members participate in the care of the young.[102]

Males sexually mature at the age of 15, but do not typically reproduce until age 21. Wild males live around 29 years on average, with a maximum of about 60 years.

Old Tom, was reportedly spotted every winter between the 1840s and 1930 off New South Wales, Australia, which would have made him up to 90 years old. Examination of his teeth indicated he died around age 35,[142] but this method of age determination is now believed to be inaccurate for older animals.[143] One male known to researchers in the Pacific Northwest (identified as J1) was estimated to have been 59 years old when he died in 2010.[144] Orcas are unique among cetaceans, as their caudal sections elongate with age, making their heads relatively shorter.[38]

Infanticide, once thought to occur only in captive orcas, was observed in wild populations by researchers off British Columbia on December 2, 2016. In this incident, an adult male killed the calf of a female within the same pod, with the adult male's mother also joining in the assault. It is theorized that the male killed the young calf in order to mate with its mother (something that occurs in other carnivore species), while the male's mother supported the breeding opportunity for her son. The attack ended when the calf's mother struck and injured the attacking male. Such behaviour matches that of many smaller dolphin species, such as the bottlenose dolphin.[145]


In 2008, the

conservation dependent to data deficient, recognizing that one or more orca types may actually be separate, endangered species.[3] Depletion of prey species, pollution, large-scale oil spills, and habitat disturbance caused by noise and conflicts with boats are the most significant worldwide threats.[3] In January 2020, the first orca in England and Wales since 2001 was found dead with a large fragment of plastic in its stomach.[146]

Like other animals at the highest

brominated flame-retardants than in polar bears. A 2018 study published in Science found that global orca populations are poised to dramatically decline due such toxic pollution.[148][149]

In the Pacific Northwest, wild salmon stocks, a main resident food source, have declined dramatically in recent years.[3] In the Puget Sound region, only 75 whales remain with few births over the last few years.[150] On the west coast of Alaska and the Aleutian Islands, seal and sea lion populations have also substantially declined.[151]

In 2005, the United States government listed the

Haro Straits and Puget Sound in British Columbia and Washington. They do not breed outside of their community, which was once estimated at around 200 animals and later shrank to around 90.[152] In October 2008, the annual survey revealed seven were missing and presumed dead, reducing the count to 83.[153] This is potentially the largest decline in the population in the past 10 years. These deaths can be attributed to declines in Chinook salmon.[153]

Scientist Ken Balcomb has extensively studied orcas since 1976; he is the research biologist responsible for discovering

CAT scans of two of the whale heads showed hemorrhaging around the brain and the ears, which is consistent with decompression sickness.[154]

Another conservation concern was made public in September 2008 when the Canadian government decided it was not necessary to enforce further protections (including the

Wilderness Committee.[155] Many scientists involved in this lawsuit, including Bill Wareham, a marine scientist with the David Suzuki Foundation, noted increased boat traffic, water toxic wastes, and low salmon population as major threats, putting approximately 87 orcas on the British Columbia Coast in danger.[155]

salmon farms were used to deter seals. Orcas also avoided the surrounding waters.[157] High-intensity sonar used by the Navy disturbs orcas along with other marine mammals.[158] Orcas are popular with whale watchers, which may stress the whales and alter their behaviour, particularly if boats approach too closely or block their lines of travel.[159]


Kenai Fjords region. Eleven members (about half) of one resident pod disappeared in the following year. The spill damaged salmon and other prey populations, which in turn damaged local orcas. By 2009, scientists estimated the AT1 transient population (considered part of a larger population of 346 transients), numbered only seven individuals and had not reproduced since the spill. This population is expected to die out.[160][161]

Orcas are included in Appendix II of the

Convention on International Trade in Endangered Species (CITES), meaning international trade (including in parts/derivatives) is regulated.[4]

Relationship with humans

Indigenous cultures

Jade carving of a killer whale with exaggerated fins and bared teeth. Its body and fins are engraved with nested ovals and other patterns.
Haida sculpture by Bill Reid


Tlingit of southeastern Alaska regarded the orca as custodian of the sea and a benefactor of humans.[163]

The Maritime Archaic people of Newfoundland also had great respect for orcas, as evidenced by stone carvings found in a 4,000-year-old burial at the Port au Choix Archaeological Site.[164][165]

In the tales and beliefs of the Siberian Yupik people, orcas are said to appear as wolves in winter, and wolves as orcas in summer.[166][167][168][169] Orcas are believed to assist their hunters in driving walrus.[170] Reverence is expressed in several forms: the boat represents the animal, and a wooden carving hung from the hunter's belt.[168] Small sacrifices such as tobacco or meat are strewn into the sea for them.[170][169]


Repun Kamuy (God of Sea/Offshore) to bring fortunes (whales) to the coasts, and there had been traditional funerals for stranded or deceased orcas akin to funerals for other animals such as brown bears.[171]

"Killer" stereotype

Killer whale silhouette, with two projections above shown above the blowhole.
Male orca depicted in St Mary's in Greifswald, Germany, 1545[15]

In Western cultures, orcas were historically feared as dangerous, savage predators.[172] The first written description of an orca was given by Pliny the Elder circa AD 70, who wrote, "Orcas (the appearance of which no image can express, other than an enormous mass of savage flesh with teeth) are the enemy of [other kinds of whale]... they charge and pierce them like warships ramming."[173]

Of the very few confirmed attacks on humans by wild orcas, none have been fatal.

attacks on humans since the 1970s, some of which have been fatal.[177][178]

Competition with fishermen also led to orcas being regarded as pests. In the waters of the Pacific Northwest and Iceland, the shooting of orcas was accepted and even encouraged by governments.[172] As an indication of the intensity of shooting that occurred until fairly recently, about 25% of the orcas captured in Puget Sound for aquariums through 1970 bore bullet scars.[179] The U.S. Navy claimed to have deliberately killed hundreds of orcas in Icelandic waters in 1956 with machine guns, rockets, and depth charges.[180][181]

Modern Western attitudes

Ingrid Visser
's research team filming orcas in New Zealand

Western attitudes towards orcas have changed dramatically in recent decades. In the mid-1960s and early 1970s, orcas came to much greater public and scientific awareness, starting with the live-capture and display of an orca known as

southern resident orca harpooned off Saturna Island in 1964.[172] He was the first ever orca to be studied at close quarters alive, not postmortem. Moby Doll's impact in scientific research at the time, including the first scientific studies of an orca's sound production, led to two articles about him in the journal Zoologica.[182][183] So little was known at the time, it was nearly two months before the whale's keepers discovered what food (fish) it was willing to eat. To the surprise of those who saw him, Moby Doll was a docile, non-aggressive whale who made no attempts to attack humans.[184]

Between 1964 and 1976, 50 orcas from the Pacific Northwest were captured for display in aquaria, and public interest in the animals grew. In the 1970s, research pioneered by Michael Bigg led to the discovery of the species' complex social structure, its use of vocal communication, and its extraordinarily stable mother–offspring bonds. Through photo-identification techniques, individuals were named and tracked over decades.[185]

Bigg's techniques also revealed the Pacific Northwest population was in the low hundreds rather than the thousands that had been previously assumed.[172] The southern resident community alone had lost 48 of its members to captivity; by 1976, only 80 remained.[186] In the Pacific Northwest, the species that had unthinkingly been targeted became a cultural icon within a few decades.[152]

The public's growing appreciation also led to growing opposition to whale–keeping in aquarium. Only one whale has been taken in North American waters since 1976. In recent years, the extent of the public's interest in orcas has manifested itself in several high-profile efforts surrounding individuals. Following the success of the 1993 film

Luna, which had become separated from his pod, could be returned to it. However, his case was marked by controversy about whether and how to intervene, and in 2006, Luna was killed by a boat propeller.[190]


The earlier of known records of commercial hunting of orcas date to the 18th century in Japan. During the 19th and early 20th centuries, the global whaling industry caught immense numbers of baleen and sperm whales, but largely ignored orcas because of their limited amounts of recoverable oil, their smaller populations, and the difficulty of taking them.[105] Once the stocks of larger species were depleted, orcas were targeted by commercial whalers in the mid-20th century. Between 1954 and 1997, Japan took 1,178 orcas (although the Ministry of the Environment claims that there had been domestic catches of about 1,600 whales between late 1940s to 1960s[191]) and Norway took 987.[192] Extensive hunting of orcas, including an Antarctic catch of 916 in 1979–80 alone, prompted the International Whaling Commission to recommend a ban on commercial hunting of the species pending further research.[192] Today, no country carries out a substantial hunt, although Indonesia and Greenland permit small subsistence hunts (see Aboriginal whaling). Other than commercial hunts, orcas were hunted along Japanese coasts out of public concern for potential conflicts with fisheries. Such cases include a semi-resident male-female pair in Akashi Strait and Harimanada being killed in the Seto Inland Sea in 1957,[193][194] the killing of five whales from a pod of 11 members that swam into Tokyo Bay in 1970,[195] and a catch record in southern Taiwan in the 1990s.[196][197]

Cooperation with humans

Orcas have helped humans hunting other whales.[198] One well-known example was the orcas of Eden, Australia, including the male known as Old Tom. Whalers more often considered them a nuisance, however, as orcas would gather to scavenge meat from the whalers' catch.[198] Some populations, such as in Alaska's Prince William Sound, may have been reduced significantly by whalers shooting them in retaliation.[20]

Whale watching

Whale watching continues to increase in popularity, but may have some problematic impacts on orcas. Exposure to exhaust gases from large amounts of vessel traffic is causing concern for the overall health of the 75 remaining southern resident orcas (SRKWs) left as of early 2019.[199] This population is followed by approximately 20 vessels for 12 hours a day during the months May–September.[200] Researchers discovered that these vessels are in the line of sight for these whales for 98–99.5% of daylight hours.[200] With so many vessels, the air quality around these whales deteriorates and impacts their health. Air pollutants that bind with exhaust fumes are responsible for the activation of the cytochrome P450 1A gene family.[200] Researchers have successfully identified this gene in skin biopsies of live whales and also the lungs of deceased whales. A direct correlation between activation of this gene and the air pollutants can not be made because there are other known factors that will induce the same gene. Vessels can have either wet or dry exhaust systems, with wet exhaust systems leaving more pollutants in the water due to various gas solubility. A modelling study determined that the lowest-observed-adverse-effect-level (LOAEL) of exhaust pollutants was about 12% of the human dose.[200]

As a response to this, in 2017 boats off the British Columbia coast now have a minimum approach distance of 200 metres compared to the previous 100 metres. This new rule complements Washington State's minimum approach zone of 180 metres that has been in effect since 2011. If a whale approaches a vessel it must be placed in neutral until the whale passes. The World Health Organization has set air quality standards in an effort to control the emissions produced by these vessels.[201]


The orca's

intelligence, trainability, striking appearance, playfulness in captivity and sheer size have made it a popular exhibit at aquaria and aquatic theme parks. From 1976 to 1997, 55 whales were taken from the wild in Iceland, 19 from Japan, and three from Argentina. These figures exclude animals that died during capture. Live captures fell dramatically in the 1990s, and by 1999, about 40% of the 48 animals on display in the world were captive-born.[202]

Organizations such as

stress.[177] Between 1991 and 2010, the bull orca known as Tilikum was involved in the death of three people, and was featured in the critically acclaimed 2013 film Blackfish.[205] Tilikum lived at SeaWorld from 1992 until his death in 2017.[206][207]

In March 2016, SeaWorld announced that they would be ending their orca breeding program and their theatrical shows.[208] As of 2020, theatrical shows featuring orcas are still ongoing, however.[209]

See also


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  2. ^ Although there are examples of killer whales living longer, including several over 30 years old, and two captive orcas (Corky II and Lolita) are in their mid-40s.


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Works cited

Further reading

External links