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The Blue Whale (Balaenoptera musculus) is a marine mammal belonging to the suborder of baleen whales (called Mysticeti). At up to in length and or more in weight, it is the largest animal ever known to have existed.

Long and slender, the Blue Whale's body can be various shades of bluish-grey dorsally and somewhat lighter underneath. There are at least three distinct subspecies: B. m. musculus of the North Atlantic and North Pacific, B. m. intermedia of the Southern Oceanmarker and B. m. brevicauda (also known as the Pygmy Blue Whale) found in the Indian Oceanmarker and South Pacific Oceanmarker. B. m. indica, found in the Indian Ocean, may be another subspecies. As with other baleen whales, its diet consists almost exclusively of small crustaceans known as krill.

Blue Whales were abundant in nearly all the oceans until the beginning of the twentieth century. For over 40 years, they were hunted almost to extinction by whalers until protected by the international community in 1966. A 2002 report estimated there were 5,000 to 12,000 Blue Whales worldwide, located in at least five groups. More recent research into the Pygmy subspecies suggests this may be an underestimate. Before whaling, the largest population was in the Antarctic, numbering approximately 239,000 (range 202,000 to 311,000). There remain only much smaller (around 2,000) concentrations in each of the North-East Pacificmarker, Antarcticmarker, and Indian Oceanmarker groups. There are two more groups in the North Atlanticmarker, and at least two in the Southern Hemispheremarker.


Blue Whales are rorquals (family Balaenopteridae), a family that includes the Humpback Whale, the Fin Whale, Bryde's Whale, the Sei Whale and the Minke Whale. The family Balaenopteridae is believed to have diverged from the other families of the suborder Mysticeti as long ago as the middle Oligocene. However, it is not known when the members of those families diverged from each other.

The Blue Whale is usually classified as one of eight species in the genus Balaenoptera; one authority places it in a separate monotypic genus, Sibbaldus, but this is not accepted elsewhere. DNA sequencing analysis indicates that the Blue Whale is phylogenetically closer to the Sei Whale (Balaenoptera borealis) and Bryde's Whale (Balaenoptera brydei) than to other Balaenoptera species, and closer to the Humpback Whale (Megaptera) and the Gray Whale (Eschrichtius) than to the minke whales (Balaenoptera acutorostrata and Balaenoptera bonaerensis). If further research confirms these relationships, it will be necessary to reclassify the rorquals.

There have been at least 11 documented cases of Blue/Fin hybrid adults in the wild. Arnason and Gullberg describe the genetic distance between a Blue and a Fin as about the same as that between a human and a gorilla. Researchers working off of Fiji believe they photographed a hybrid Humpback/Blue Whale.

The specific name musculus is Latin and could mean "muscular", but it can also be interpreted as "little mouse". Linnaeus, who named the species in his seminal Systema Naturae of 1758, would have known this and may have intended the ironic double meaning. Herman Melville called this species Sulphur-bottom in his novel Moby-Dick due to an orange-brown or yellow tinge on the underparts from diatom films on the skin. Other common names for the Blue Whale have included the Sibbald's Rorqual (after Sir Robert Sibbald), the Great Blue Whale and the Great Northern Rorqual. These names have now fallen into disuse.

Authorities classify the species into three or four subspecies: B. m. musculus, the Northern Blue Whale consisting of the North Atlantic and North Pacific populations, B. m. intermedia, the Southern Blue Whale of the Southern Oceanmarker, B. m. brevicauda, the Pygmy Blue Whale found in the Indian Ocean and South Pacific, and the more problematic B. m. indica, the Great Indian Rorqual, which is also found in the Indian Ocean and, although described earlier, may be the same subspecies as B. m. brevicauda.

Description and behaviour

Adult Blue Whale
Aerial view of a Blue Whale showing both pectoral fins
The blow of a Blue Whale

The Blue Whale has a long tapering body that appears stretched in comparison with the stockier build of other whales. The head is flat and U-shaped and has a prominent ridge running from the blowhole to the top of the upper lip. The front part of the mouth is thick with baleen plates; around 300 plates (each around one metre (3.2 ft) long) hang from the upper jaw, running 0.5 m (1.6 ft) back into the mouth. Between 60 and 90 grooves (called ventral pleats) run along the throat parallel to the body. These pleats assist with evacuating water from the mouth after lunge feeding (see feeding below).

The dorsal fin is small, visible only briefly during the dive sequence. Located around three-quarters of the way along the length of the body, it varies in shape from one individual to another; some only have a barely perceptible lump, but others may have prominent and falcate dorsals. When surfacing to breathe, the Blue Whale raises its shoulder and blowhole out of the water to a greater extent than other large whales such as the Fin or Sei. Observers can use this trait to differentiate between species at sea. Some Blue Whales in the North Atlantic and North Pacific raise their tail fluke when diving. When breathing, the whale emits a spectacular vertical single-column spout up to , typically . Its lung capacity is 5,000 litres (1320 U.S. gallons). Blue whales have twin blowholes shielded by a large splashguard.

The flippers are long. The upper sides are grey with a thin white border. The lower sides are white. The head and tail fluke are generally uniformly grey. The whale's upper parts, and sometimes the flippers, are usually mottled. The degree of mottling varies substantially from individual to individual. Some may have a uniform slate-grey color, but others demonstrate a considerable variation of dark blues, greys and blacks, all tightly mottled.

Blue Whales can reach speeds of over short bursts, usually when interacting with other whales, but is a more typical traveling speed. When feeding, they slow down to .

Blue Whales most commonly live alone or with one other individual. It is not known how long traveling pairs stay together. In locations where there is a high concentration of food, as many as 50 Blue Whales have been seen scattered over a small area. However, they do not form the large close-knit groups seen in other baleen species.


Blue Whales are difficult to weigh because of their size. Most Blue Whales killed by whalers were not weighed whole, but cut up into manageable pieces first. This caused an underestimate of the total weight of the whale, due to the loss of blood and other fluids. Nevertheless, measurements between were recorded of animals up to in length. The weight of a individual is believed by the American National Marine Mammal Laboratory (NMML) to be in excess of . The largest Blue Whale accurately weighed by NMML scientists to date was a female that weighed .

The Blue Whale is the largest animal ever known to have lived. The largest known dinosaur of the Mesozoic Era was the Argentinosaurus, which is estimated to have weighed up to , though a controversial vertebra of Amphicoelias fragillimus may indicate an animal of up to and . Furthermore, there are weight estimates for the very poorly known Bruhathkayosaurus ranging from , besides length estimates up to about . The extinct fish Leedsichthys may have approached its size. However, complete fossils are difficult to come by, making size comparisons difficult. All these animals are considered to be smaller than the blue whale.

There is some uncertainty about the biggest Blue Whale ever found, as most data comes from Blue Whales killed in Antarcticmarker waters during the first half of the twentieth century and was collected by whalers not well-versed in standard zoological measurement techniques. The longest whales ever recorded were two females measuring respectively. The longest whale measured by scientists at the NMML was .

A Blue Whale's tongue weighs around and, when fully expanded, its mouth is large enough to hold up to of food and water. Despite the size of its mouth, the dimensions of its throat are such that a Blue Whale cannot swallow an object wider than a beach ball. Its heart weighs and is the largest known in any animal. A Blue Whale's aorta is about in diameter. During the first seven months of its life, a Blue Whale calf drinks approximately 400 litres (100 U.S. gallons) of milk every day. Blue Whale calves gain weight quickly, as much as every 24 hours. Even at birth, they weigh up to —the same as a fully grown hippopotamus.


Blue Whales feed almost exclusively on krill, though they also take small numbers of copepods. The species of this zooplankton eaten by Blue Whales varies from ocean to ocean. In the North Atlantic, Meganyctiphanes norvegica, Thysanoessa raschii, Thysanoessa inermis and Thysanoessa longicaudata are the usual food; in the North Pacific, Euphausia pacifica, Thysanoessa inermis, Thysanoessa longipes, Thysanoessa spinifera, Nyctiphanes symplex and Nematoscelis megalops; and in the Antarctic, Euphausia superba, Euphausia crystallorophias and Euphausia valentin.

An adult Blue Whale can eat up to 40 million krill in a day. The whales always feed in the areas with the highest concentration of krill, sometimes eating up to of krill in a single day. This daily calorie requirement of an adult Blue Whale is in the region of 1.5 million. This means that they typically feed at depths of more than during the day and only surface-feed at night. Dive times are typically 10 minutes when feeding, though dives of up to 20 minutes are common. The longest recorded dive is 36 minutes. The whale feeds by lunging forward at groups of krill, taking the animals and a large quantity of water into its mouth. The water is then squeezed out through the baleen plates by pressure from the ventral pouch and tongue. Once the mouth is clear of water, the remaining krill, unable to pass through the plates, are swallowed. The Blue Whale also incidentally consumes small fish, crustaceans and squid caught up with krill.

Life history

A juvenile Blue Whale with its mother
Mating starts in late autumn and continues to the end of winter. Little is known about mating behaviour or breeding grounds. Females typically give birth once every two to three years at the start of the winter after a gestation period of ten to twelve months. The calf weighs about and is around in length. Blue Whale calves drink 380–570 litres (100–150 U.S. gallons) of milk a day. Weaning takes place for about six months, by which time the calf has doubled in length. Sexual maturity is typically reached at eight to ten years, by which time males are at least long (or more in the Southern Hemisphere). Females are larger still, reaching sexual maturity at around the age of five, by which they are about long.

Scientists estimate that Blue Whales can live for at least 80 years; however, since individual records do not date back into the whaling era, this will not be known with certainty for many years. The longest recorded study of a single individual is 34 years, in the north-east Pacific. The whales' only natural predator is the Orca. Studies report that as many as 25% of mature Blue Whales have scars resulting from Orca attacks. The mortality rate of such attacks is unknown.

Blue Whale strandings are extremely uncommon, and, because of the species' social structure, mass strandings are unheard of. However, when strandings do occur, they can become the focus of public interest. In 1920, a Blue Whale washed up near Bragarmarker on the Isle of Lewis in the Outer Hebridesmarker of Scotlandmarker. It had been shot in the head by whalers, but the harpoon had failed to explode. As with other mammals, the fundamental instinct of the whale was to try to carry on breathing at all costs, even though this meant beaching to prevent itself from drowning. Two of the whale's bones were erected just off a main road on Lewis and remain a tourist attraction.


Multimedia relating to the Blue Whale

Note that the whale calls have been sped up 10x from their original speed.
Estimates made by Cummings and Thompson (1971) suggest that source level of sounds made by Blue Whales are between 155 and 188 decibels when measured relative to a reference pressure of one micropascal at one metre. All Blue Whale groups make calls at a fundamental frequency of between 10 and 40 Hz, and the lowest frequency sound a human can typically perceive is 20 Hz. Blue Whale calls last between ten and thirty seconds. Blue Whales off the coast of Sri Lankamarker have been repeatedly recorded making "songs" of four notes duration lasting about two minutes each, reminiscent of the well-known Humpback Whale songs. Researchers believe that as this phenomenon has not been seen in any other populations, it may be unique to the B. m. brevicauda (Pygmy) subspecies.

The reason for vocalization is unknown. Richardson et al. (1995) discuss six possible reasons:

  1. Maintenance of inter-individual distance
  2. Species and individual recognition
  3. Contextual information transmission (e.g., feeding, alarm, courtship)
  4. Maintenance of social organization (e.g., contact calls between females and males)
  5. Location of topographic features
  6. Location of prey resources

Population and whaling

Hunting era

Blue Whale populations have declined dramatically due to commercial whaling.

Blue Whales are not easy to catch or kill. Their speed and power meant that they were rarely pursued by early whalers, who instead targeted Sperm and Right Whales. In 1864, the Norwegian Svend Foyn equipped a steamboat with harpoons specifically designed for catching large whales. Although initially cumbersome and with a low success rate, Foyn perfected the harpoon gun, and soon several whaling stations were established on the coast of Finnmarkmarker in northern Norwaymarker. Because of disputes with the local fishermen, the last whaling station in Finnmark was closed down in 1904.

Soon, Blue Whales were being hunted in Icelandmarker (1883), the Faroe Islandsmarker (1894), Newfoundlandmarker (1898), and Spitsbergenmarker (1903). In 1904-05 the first Blue Whales were taken off South Georgia. By 1925, with the advent of the stern slipway in factory ships and the use of steam-driven whale catchers, the catch of Blue Whales, and baleen whales as a whole, in the Antarctic and sub-Antarctic began to increase dramatically. Between 1930 and 1931, these ships killed 29,400 Blue Whales in the Antarctic alone. By the end of World War II, populations had been significantly depleted, and, in 1946, the first quotas restricting international trade in whales were introduced, but they were ineffective because of the lack of differentiation between species. Rare species could be hunted on an equal footing with those found in relative abundance.

Blue Whale hunting was banned in the 1960s by the International Whaling Commission, and illegal whaling by the USSR finally halted in the 1970s, by which time 330,000 Blue Whales had been killed in the Antarctic, 33,000 in the rest of the Southern Hemisphere, 8,200 in the North Pacific, and 7,000 in the North Atlantic. The largest original population, in the Antarctic, had been reduced to 0.15% of their initial numbers.

Population and distribution today

Since the introduction of the whaling ban, studies have failed to ascertain whether the conservation reliant global Blue Whale population is increasing or remaining stable. In the Antarctic, best estimates show a significant increase at 7.3% per year since the end of illegal Soviet whaling, but numbers remain at under 1% of their original levels. It has also been suggested that Icelandic and Californian populations are increasing but these increases are not statistically significant. The total world population was estimated to be between 5,000 and 12,000 in 2002, although there are high levels of uncertainty in available estimates for many areas.

The IUCN Red List counts the Blue Whale as "endangered" as it has since the list's inception. In the United Statesmarker, the National Marine Fisheries Service lists them as endangered under the Endangered Species Act. The largest known concentration, consisting of about 2,000 individuals, is the North-East Pacific population of the Northern Blue Whale (B. m. musculus) subspecies that ranges from Alaskamarker to Costa Ricamarker but is most commonly seen from California in summer. Infrequently, this population visits the North-West Pacific between Kamchatkamarker and the northern tip of Japan.

In the North Atlantic, two stocks of B. m. musculus are recognized. The first is found off Greenlandmarker, Newfoundlandmarker, Nova Scotiamarker and the Gulf of Saint Lawrencemarker. This group is estimated to total about 500. The second, more easterly group is spotted from the Azores in spring to Iceland in July and August; it is presumed that the whales follow the Mid-Atlantic Ridge between the two volcanic islands. Beyond Iceland, Blue Whales have been spotted as far north as Spitsbergenmarker and Jan Mayenmarker, though such sightings are rare. Scientists do not know where these whales spend their winters. The total North Atlantic population is estimated to be between 600 and 1,500.

In the Southern Hemisphere, there appear to be two distinct subspecies, B. m. intermedia, the Antarctic Blue Whale, and the little-studied Pygmy Blue Whale, B. m. brevicauda, found in Indian Ocean waters. The most recent surveys (midpoint 1998) provided an estimate of 2,280 blue whales in the Antarctic., of which fewer than 1% are likely to be pygmy blue whales Estimates from a 1996 survey were that 424 Pygmy Blue Whales were in a small area south of Madagascarmarker alone, thus it is likely that numbers in the entire Indian Ocean are in the thousands. If this is true, the global numbers would be much higher than estimates predict.

A fourth subspecies, B. m. indica, was identified by Blyth in 1859 in the northern Indian Ocean, but difficulties in identifying distinguishing features for this subspecies led to it being used a synonym for B. m. brevicauda, the Pygmy Blue Whale. Records for Soviet catches seem to indicate that the female adult size is closer to that of the Pygmy Blue than B. m. musculus, although the populations of B. m. indica and B. m. brevicauda appear to be discrete, and the breeding seasons differ by almost six months.

Migratory patterns of these subspecies are not well known. For example, Pygmy Blue Whales have been recorded in the northern Indian Ocean (Omanmarker, Maldivesmarker, Sri Lankamarker), where they may form a distinct resident population. In addition, the population of Blue Whales occurring off Chilemarker and Perumarker may also be a distinct population. Some Antarctic Blue Whales approach the eastern South Atlantic coast in winter, and occasionally, their vocalizations are heard off Peru, Western Australia, and in the northern Indian Ocean. In Chile, the Cetacean Conservation Center, with support from the Chilean Navy, is undertaking extensive research and conservation work on a recently discovered feeding aggregation of the species off the coast of Chiloe Islandmarker in an area named "Golfo del Corcovado", where 326 Blue Whales were spotted in the summer of 2007.

Efforts to calculate the Blue Whale population more accurately are supported by marine mammologists at Duke Universitymarker who maintain the OBIS-SEAMAP (Ocean Biogeographic Information System—Spatial Ecological Analysis of Megavertebrate Populations), a collation of marine mammal sighting data from around 130 sources.

Threats other than hunting

Due to their enormous size, power and speed, adult Blue Whales have virtually no natural predators. There is, however, one documented case in National Geographic Magazine of a Blue Whale being attacked by Orcas; although the Orcas were unable to kill the animal outright during their attack, the Blue Whale sustained massive wounds and probably died as a result of them shortly after the attack.

Blue Whales may be wounded, sometimes fatally, after colliding with ocean vessels as well as becoming trapped or entangled in fishing gear. The ever-increasing amount of ocean noise, including sonar, drowns out the vocalizations produced by whales, which may make it harder for them to communicate. Human threats to the potential recovery of Blue Whale populations also include accumulation of polychlorinated biphenyl (PCB) chemicals within the whale's body.

With global warming causing glaciers and permafrost to melt rapidly and allowing a large amount of fresh water to flow into the oceans, there are concerns that if the amount of fresh water in the oceans reaches a critical point, there will be a disruption in the thermohaline circulation. Considering the Blue Whale's migratory patterns are based on ocean temperature, a disruption in this circulation, which moves warm and cold water around the world, would be likely to have an effect on their migration. The whales summer in the cool, high latitudes, where they feed in krill-abundant waters; they winter in warmer, low latitudes, where they mate and give birth.

The change in ocean temperature would also affect the Blue Whale's food supply. The warming trend and decreased salinity levels would cause a significant shift in krill location and abundance.


The Natural History Museum in Londonmarker contains a famous mounted skeleton and life-size model of a Blue Whale, which were both the first of their kind in the world but have since been replicated at the University of California, Santa Cruzmarker. Similarly, the American Museum of Natural Historymarker in New York Citymarker has a full-size model in its Milstein Family Hall of Ocean Life.

The Aquarium of the Pacificmarker in Long Beach, Californiamarker features a life-size model of a mother Blue Whale with her calf suspended from the ceiling of its main hall.


Living Blue Whales may be encountered on whale-watching cruises in the Gulf of Mainemarker and are the main attractions along the north shore of the Gulf of Saint Lawrencemarker and in the Saint Lawrence estuary.


  1. FI - Species fact sheets. Fisheries and Aquaculture Department, Food and Agriculture Organization.
  2. Amazing Whale Facts Archive. Whale Center of New England (WCNE). Retrieved on 2008-02-27.
  3. Ichihara T. (1966). The pygmy blue whale B. m. brevicauda, a new subspecies from the Antarctic in Whales, dolphins and porpoises Page(s) 79-113.
  4. Carpenter, K. (2006). "Biggest of the big: a critical re-evaluation of the mega-sauropod Amphicoelias fragillimus." In Foster, J.R. and Lucas, S.G., eds., 2006, Paleontology and Geology of the Upper Jurassic Morrison Formation. New Mexico Museum of Natural History and Science Bulletin 36: 131-138.[1]
  5. Blue Planet: Frozen seas (BBC documentary)
  6. Hunted, rammed, poisoned, whales may die from heartbreak too
  7. Piper, Ross (2007), Extraordinary Animals: An Encyclopedia of Curious and Unusual Animals, Greenwood Press.
  8. (Sears 1998)
  9. William Perrin and Joseph Geraci. "Stranding" pp 1192–1197 in Encyclopedia of Marine Mammals (Perrin, Wursig and Thewissen eds)
  10. The data for the Blue Whale, along with a species profile, may be found here [2]


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