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68-540: Mount Minami ( 南岳 , Minami-dake ) is a volcano located on the Shiretoko Peninsula in Hokkaido , northeastern Japan . This Hokkaidō location article is a stub . You can help Misplaced Pages by expanding it . Shiretoko Peninsula The Shiretoko Peninsula was registered as a UNESCO World Heritage Site in 2005, in recognition of the peninsula being the southernmost point where sea ice usually forms in

136-452: A deep sleep for about 7 percent of the time, most often between 6 p.m. and midnight. Sperm whales have 21 pairs of chromosomes ( 2n=42 ). The genome of live whales can be examined by recovering shed skin. After Valentine Worthington and William E. Schevill confirmed the existence of sperm whale vocalization, further studies found that sperm whales are capable of emitting sounds at a source level of 230 decibels   –   making

204-424: A down force of about 392 newtons (88 lb f ) and allows the whale to dive with less effort. During the hunt, oxygen consumption, together with blood vessel dilation, produces heat and melts the spermaceti, increasing its buoyancy and enabling easy surfacing. However, more recent work has found many problems with this theory including the lack of anatomical structures for the actual heat exchange. Another issue

272-503: A liquid mixture of fats and waxes called spermaceti . The purpose of this complex is to generate powerful and focused clicking sounds, the existence of which was proven by Valentine Worthington and William Schevill when a recording was produced on a research vessel in May 1959. The sperm whale uses these sounds for echolocation and communication. The spermaceti organ is like a large barrel of spermaceti. Its surrounding wall, known as

340-425: A number of specific adaptations for the aquatic environment. The diameter of the aortic arch increases as it leaves the heart. This bulbous expansion acts as a windkessel , ensuring a steady blood flow as the heart rate slows during diving. The arteries that leave the aortic arch are positioned symmetrically. There is no costocervical artery . There is no direct connection between the internal carotid artery and

408-505: A tour around the Shiretoko peninsula. The boat was found 100 meters below sea level near the scenic site Kashuni Falls. The bodies of 14 people were found and 12 went missing. The Shiretoko Peninsula is home to many species of both conifers and broadleaf trees , including the acorn -bearing Quercus mongolica ( mizunara ). Siberian dwarf pine trees grow above 1,000 metres (3,000 ft). Red foxes and sika deer also inhabit

476-439: Is a member of the unranked clade Cetacea , with all the whales, dolphins, and porpoises, and further classified into Odontoceti , containing all the toothed whales and dolphins. It is the sole extant species of its genus, Physeter , in the family Physeteridae . Two species of the related extant genus Kogia , the pygmy sperm whale Kogia breviceps and the dwarf sperm whale K. sima , are placed either in this family or in

544-660: Is also known as the "cachalot", which is thought to derive from the archaic French for 'tooth' or 'big teeth', as preserved for example in the word caishau in the Gascon dialect (a word of either Romance or Basque origin). The etymological dictionary of Corominas says the origin is uncertain, but it suggests that it comes from the Vulgar Latin cappula 'sword hilts'. The word cachalot came to English via French from Spanish or Portuguese cachalote , perhaps from Galician /Portuguese cachola 'big head'. The term

612-591: Is bounded on the northwest side by the Sea of Okhotsk and the southeast side by the Pacific Ocean. To the east, Kunashiri Island runs parallel to the peninsula. The Kunashiri can be seen from Shiretoko Peninsula. Kunashiri has been occupied by Russia since September 1, 1945, and disputed by Japan. The cold Oyashio Current flows southwest along the east side of the peninsula, and the Soya Current flows southeast from

680-546: Is cited by some authors as the largest accurately measured. It has been estimated to weigh 80 tonnes (79 long tons; 88 short tons). In a review of size variation in marine megafauna, McClain and colleagues noted that the International Whaling Commission's data contained eight individuals larger than 20.7 metres (68 ft). The authors supported a 24-metre (79 ft) male from the South Pacific in 1933 as

748-401: Is estimated to have weighed 57 tonnes (56 long tons; 63 short tons). By contrast, the second largest toothed whale ( Baird's beaked whale ) measures up to 12.8 meters (42 ft) and weighs up to 14 tonnes (15 short tons). There are occasional reports of individual sperm whales achieving even greater lengths, with some historical claims reaching or exceeding 80 feet (24 m). One example

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816-421: Is not the only factor. Elephants and dolphins also have larger brains than humans. The sperm whale has a lower encephalization quotient than many other whale and dolphin species, lower than that of non-human anthropoid apes , and much lower than that of humans. The sperm whale's cerebrum is the largest in all mammalia, both in absolute and relative terms. The olfactory system is reduced, suggesting that

884-413: Is one of the few places where groups of male sperm whales and beaked whales including Baird's beaked whales can be spotted from the shore. Other frequently seen species include minke whales , Pacific white-sided dolphins , Dall's porpoises , and harbour porpoises . Newly described Sato's beaked whale inhabits the area as well. 。 Endangered populations of humpback whales and fin whales in

952-674: Is retained in the Russian word for the animal, kashalot ( кашалот ), as well as in many other languages. The scientific genus name Physeter comes from the Greek physētēr ( φυσητήρ ), meaning 'blowpipe, blowhole (of a whale)', or – as a pars pro toto – 'whale'. The specific name macrocephalus is Latinized from the Greek makroképhalos ( μακροκέφαλος 'big-headed'), from makros ( μακρός ) + kephalē ( κεφαλή ). Its synonymous specific name catodon means 'down-tooth', from

1020-476: Is that if the spermaceti does indeed cool and solidify, it would affect the whale's echolocation ability just when it needs it to hunt in the depths. Herman Melville 's fictional story Moby-Dick suggests that the "case" containing the spermaceti serves as a battering ram for use in fights between males. A few famous instances include the well-documented sinking of the ships Essex and Ann Alexander by attackers estimated to weigh only one-fifth as much as

1088-425: Is that the teeth are used in aggression between males. Mature males often show scars which seem to be caused by the teeth . Rudimentary teeth are also present in the upper jaw, but these rarely emerge into the mouth. Analyzing the teeth is the preferred method for determining a whale's age. Like the age-rings in a tree, the teeth build distinct layers of cementum and dentine as they grow. The sperm whale brain

1156-399: Is the largest known of any modern or extinct animal, weighing on average about 7.8 kilograms (17 lb) (with the smallest known weighing 6.4 kilograms (14 lb) and the largest known weighing 9.2 kilograms (20 lb)), more than five times heavier than a human brain , and has a volume of about 8,000 cm . Although larger brains generally correlate with higher intelligence, it

1224-528: Is the whale that sank the Essex (one of the incidents behind Moby-Dick ), which was claimed to be 85 feet (26 m). However, there is disagreement as to the accuracy of some of these claims, which are often considered exaggerations or as being measured along the curves of the body. An individual measuring 20.7 metres (68 ft) was reported from a Soviet whaling fleet near the Kuril Islands in 1950 and

1292-563: Is unlikely to be confused with any other species. The sperm whale's distinctive shape comes from its very large, block-shaped head, which can be one-quarter to one-third of the animal's length. The S-shaped blowhole is located very close to the front of the head and shifted to the whale's left. This gives rise to a distinctive bushy, forward-angled spray. The sperm whale's flukes (tail lobes) are triangular and very thick. Proportionally, they are larger than that of any other cetacean, and are very flexible. The whale lifts its flukes high out of

1360-631: Is very thick and contains a fibrous tapetum lucidum . Like other toothed whales, the sperm whale can retract and protrude its eyes, thanks to a 2-cm-thick retractor muscle attached around the eye at the equator, but are unable to roll the eyes in their sockets. According to Fristrup and Harbison (2002), sperm whale's eyes afford good vision and sensitivity to light. They conjectured that sperm whales use vision to hunt squid, either by detecting silhouettes from below or by detecting bioluminescence. If sperm whales detect silhouettes, Fristrup and Harbison suggested that they hunt upside down, allowing them to use

1428-550: The Northern Hemisphere . From Shiretoko Cape at the tip of the peninsula, a series of volcanoes runs down the peninsula, including Mount Shiretoko , Mount Unabetsu , and Mount Iō . It is part of the Chishima volcanic zone. The highest peak is Mount Rausu . The peninsula is 70 kilometres (43 mi) long and 25 kilometres (16 mi) wide at its base. It covers some 123,000 hectares (470 sq mi) The peninsula

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1496-477: The case , is extremely tough and fibrous. The case can hold within it up to 1,900 litres of spermaceti. It is proportionately larger in males. This oil is a mixture of triglycerides and wax esters . It has been suggested that it is homologous to the dorsal bursa organ found in dolphins. The proportion of wax esters in the spermaceti organ increases with the age of the whale: 38–51% in calves, 58–87% in adult females, and 71–94% in adult males. The spermaceti at

1564-437: The southern elephant seal and Cuvier's beaked whale . The sperm whale uses echolocation and vocalization with source level as loud as 236 decibels (re 1 μPa m) underwater, the loudest of any animal. It has the largest brain on Earth, more than five times heavier than a human's. Sperm whales can live 70 years or more. Sperm whales' heads are filled with a waxy substance called " spermaceti " (sperm oil), from which

1632-473: The sperm whale family , along with the pygmy sperm whale and dwarf sperm whale of the genus Kogia . The sperm whale is a pelagic mammal with a worldwide range, and will migrate seasonally for feeding and breeding. Females and young males live together in groups, while mature males (bulls) live solitary lives outside of the mating season. The females cooperate to protect and nurse their young. Females give birth every four to twenty years, and care for

1700-465: The Greek elements cat(a)- ('below') and odṓn ('tooth'); so named because it has visible teeth only in its lower jaw. ( See " Jaws and teeth " below. ) Another synonym australasianus (' Australasian ') was applied to sperm whales in the Southern Hemisphere. The sperm whale belongs to the order Cetartiodactyla , the order containing all cetaceans and even-toed ungulates . It

1768-473: The Sea of Okhotsk have started to recover in recent years. Some beluga whales , or white whales, that are thought to be vagrants from the endangered population in the northern Sea of Okhotsk do occur, specifically a sub-adult individual that continuously appeared at the town of Shibetsu for several years in the 2000s. North Pacific right whales , the most endangered of all the great whales, have been observed close to

1836-575: The Sea of Okhotsk until it is redirected north along the west side of the peninsula. In winter, the Soya Current carries sea ice south from the Sea of Okhotsk where it dams along the west side of the Shiretoko Peninsula resulting in the lowest latitude regularly occurring sea ice on earth at 43 degrees north . The volcanic zone has made several onsen possible, including Seseki Onsen and Iwaobetsu Onsen. The Oyashio Current profoundly impacts

1904-410: The area is out of their normal range. There is notable flora diversity including endemic Cymathaere japonica , endangered species such as Viola kitamiana ( Japanese ) which Japanese name was named after Shiretoko Peninsula, Dendranthema arcticum , Astragalus japonicus . To protect the wild animals and natural environment of the Shiretoko Peninsula, in 1964 a great portion of the peninsula

1972-453: The area. Especially for orcas , or killer whales, the waters surrounding the peninsula are regarded as one of the most significant habitat areas in the northwestern Pacific. There was a notable mass stranding of twelve animals in February 2005. Nine animals died. In 2019, two white individuals have been sighted. In 2019 and 2021, several white individuals were seen. Shiretoko Peninsula

2040-572: The area. There are a large number of Ussuri brown bears . The upper reaches of Mount Rausu, Mount Onnebetsu, and Mount Shari are the only known breeding areas of Arctic warblers in Hokkaidō. Sea eagles flourish here, and seals can be often seen on the coast. The last confirmed record of Japanese otter in Hokkaido was from Shari River Whale watching is a popular attraction for tourists. Thirteen or fourteen species of cetaceans have been recorded in

2108-417: The brain and other essential organs when oxygen levels deplete. The spermaceti organ may also play a role by adjusting buoyancy (see below ). The arterial retia mirabilia are extraordinarily well-developed. The complex arterial retia mirabilia of the sperm whale are more extensive and larger than those of any other cetacean. Atop the whale's skull is positioned a large complex of organs filled with

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2176-407: The calves for more than a decade. A mature, healthy sperm whale has no natural predators, although calves and weakened adults are sometimes killed by pods of killer whales (orcas). Mature males average 16 metres (52 ft) in length, with the head representing up to one-third of the animal's length. Plunging to 2,250 metres (7,380 ft), it is the third deepest diving mammal, exceeded only by

2244-415: The core of the organ has a higher wax content than the outer areas. The speed of sound in spermaceti is 2,684 m/s (at 40 kHz, 36 °C), making it nearly twice as fast as in the oil in a dolphin's melon . Below the spermaceti organ lies the "junk" which consists of compartments of spermaceti separated by cartilage. It is analogous to the melon found in other toothed whales. The structure of

2312-535: The family Kogiidae . In some taxonomic schemes the families Kogiidae and Physeteridae are combined as the superfamily Physeteroidea (see the separate entry on the sperm whale family ). Swedish ichthyologist Peter Artedi described it as Physeter catodon in his 1738 work Genera piscium , from the report of a beached specimen in Orkney in 1693 and two beached in the Netherlands in 1598 and 1601. The 1598 specimen

2380-477: The forward parts of the ventral visual fields for binocular vision . For some time researchers have been aware that pods of sperm whales may sleep for short periods, assuming a vertical position with their heads just below or at the surface, or head down. A 2008 study published in Current Biology recorded evidence that whales may sleep with both sides of the brain. It appears that some whales may fall into

2448-602: The grounds that the names were synonyms published simultaneously, and, therefore, the ICZN Principle of the First Reviser should apply. In this instance, it led to the choice of P. macrocephalus over P. catodon , a view re-stated in Holthuis, 1987. This has been adopted by most subsequent authors, although Schevill (1986 and 1987 ) argued that macrocephalus was published with an inaccurate description and that therefore only

2516-405: The junk redistributes physical stress across the skull and may have evolved to protect the head during ramming. Running through the head are two air passages. The left passage runs alongside the spermaceti organ and goes directly to the blowhole, whilst the right passage runs underneath the spermaceti organ and passes air through a pair of phonic lips and into the distal sac at the very front of

2584-477: The knobs trap a film of air that is consistent whatever the orientation or depth of the whale, making it an excellent sound mirror . The spermaceti organs may also help adjust the whale's buoyancy . It is hypothesized that before the whale dives, cold water enters the organ, and it is likely that the blood vessels constrict, reducing blood flow, and, hence, temperature. The wax therefore solidifies and reduces in volume. The increase in specific density generates

2652-479: The largest of this group, are most frequently observed close to shore. An unidentified form or subspecies of beaked whale is known to inhabit the waters off Shiretoko Peninsula and Abashiri. Long-finned pilot whales which once inhabited the waters around Hokkaido are thought to have become extinct in the 12th century, but unconfirmed sightings of short-finned pilot whales have been reported in Nemuro Strait though

2720-640: The largest recorded. However, sizes like these are rare, with 95% of recorded sperm whales below 15.85 metres (52.0 ft). In 1853, one sperm whale was reported at 62 feet (19 m) in length, with a head measuring 20 feet (6.1 m). Large lower jawbones are held in the British Natural History Museum and the Oxford University Museum of Natural History , measuring 5 metres (16 ft) and 4.7 metres (15 ft), respectively. The average size of sperm whales has decreased over

2788-455: The left side of the skull. The sperm whale's lower jaw is very narrow and underslung. The sperm whale has 18 to 26 teeth on each side of its lower jaw which fit into sockets in the upper jaw. The teeth are cone-shaped and weigh up to 1 kilogram (2.2 lb) each. The teeth are functional, but do not appear to be necessary for capturing or eating squid, as well-fed animals have been found without teeth or even with deformed jaws. One hypothesis

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2856-443: The longest intestinal system in the world, exceeding 300 m in larger specimens. The sperm whale has a four-chambered stomach that is similar to ruminants . The first secretes no gastric juices and has very thick muscular walls to crush the food (since whales cannot chew) and resist the claw and sucker attacks of swallowed squid. The second chamber is larger and is where digestion takes place. Undigested squid beaks accumulate in

2924-430: The melon. At the posterior end of this spermaceti complex is the frontal sac, which covers the concave surface of the cranium. The posterior wall of the frontal sac is covered with fluid-filled knobs, which are about 4–13 mm in diameter and separated by narrow grooves. The anterior wall is smooth. The knobbly surface reflects sound waves that come through the spermaceti organ from the phonic lips. The grooves between

2992-407: The nose. The distal sac is connected to the blowhole and the terminus of the left passage. When the whale is submerged, it can close the blowhole, and air that passes through the phonic lips can circulate back to the lungs. The sperm whale, unlike other odontocetes, has only one pair of phonic lips, whereas all other toothed whales have two, and it is located at the front of the nose instead of behind

3060-589: The novel Moby-Dick . The species is protected by the International Whaling Commission moratorium, and is listed as vulnerable by the International Union for Conservation of Nature . The name "sperm whale" is a clipping of "spermaceti whale". Spermaceti , originally mistakenly identified as the whales' semen , is the semi-liquid, waxy substance found within the whale's head. ( See " Spermaceti organ and melon " below. ) The sperm whale

3128-413: The second chamber – as many as 18,000 have been found in some dissected specimens. Most squid beaks are vomited by the whale, but some occasionally make it to the hindgut. Such beaks precipitate the formation of ambergris . In 1959, the heart of a 22 metric-ton (24 short-ton) male taken by whalers was measured to be 116 kilograms (256 lb), about 0.5% of its total mass. The circulatory system has

3196-477: The ships. The sperm whale's eye does not differ greatly from those of other toothed whales except in size. It is the largest among the toothed whales, weighing about 170 g. It is overall ellipsoid in shape, compressed along the visual axis, measuring about 7×7×3 cm. The cornea is elliptical and the lens is spherical. The sclera is very hard and thick, roughly 1 cm anteriorly and 3 cm posteriorly. There are no ciliary muscles . The choroid

3264-475: The shore mainly on the Sea of Okhotsk side of the peninsula for several times including in 2013, 2018, and 2019 with several sightings noted in 2013 and 2019, and 2018 sighting and one of 2019 sighting have been made by the same tour operator, Doutou Kanko Kaihatsu (Corporation) ( jp:道東観光開発 ). From June 21 to 23, 2015, the first ever sighting of a bowhead whale in the Japanese EEZ occurred (the first record of

3332-494: The sound energy is then reflected off the frontal sac at the cranium and into the melon, whose lens-like structure focuses it. Some of the sound will reflect back into the spermaceti organ and back towards the front of the whale's nose, where it will be reflected through the spermaceti organ a third time. This back and forth reflection which happens on the scale of a few milliseconds creates a multi-pulse click structure. This multi-pulse click structure allows researchers to measure

3400-465: The species catodon was valid, rendering the principle of "First Reviser" inapplicable. The most recent version of ITIS has altered its usage from P. catodon to P. macrocephalus , following L. B. Holthuis and more recent (2008) discussions with relevant experts. Furthermore, The Taxonomy Committee of the Society for Marine Mammalogy , the largest international association of marine mammal scientists in

3468-582: The species in the nation was of a catch record in Osaka Bay on June 23, 1969). Several records from whaling days show blue whales to have been harpooned and landed at Abashiri port, though this species normally does not enter adjacent seas and are now thought to be almost extinct in Japan's waters. As deep, productive water, some species of beaked whales favor the area including Cuvier's beaked whales , Stejneger's beaked whales , and others. Baird's beaked whales,

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3536-423: The sperm whale has a poor sense of taste and smell. By contrast, the auditory system is enlarged. The pyramidal tract is poorly developed, reflecting the reduction of its limbs. The sperm whale respiratory system has adapted to cope with drastic pressure changes when diving. The flexible ribcage allows lung collapse, reducing nitrogen intake, and metabolism can decrease to conserve oxygen . Between dives,

3604-417: The sperm whale has a vestigial pelvis that is not connected to the spine. Like that of other toothed whales , the skull of the sperm whale is asymmetrical so as to aid echolocation . Sound waves that strike the whale from different directions will not be channeled in the same way. Within the basin of the cranium, the openings of the bony narial tubes (from which the nasal passages spring) are skewed towards

3672-411: The sperm whale surfaces to breathe for about eight minutes before diving again. Odontoceti (toothed whales) breathe air at the surface through a single, S-shaped blowhole, which is extremely skewed to the left. Sperm whales spout (breathe) 3–5 times per minute at rest, increasing to 6–7 times per minute after a dive. The blow is a noisy, single stream that rises up to 2 metres (6.6 ft) or more above

3740-422: The sperm whale the loudest animal in the world. When echolocating , the sperm whale emits a directionally focused beam of broadband clicks. Clicks are generated by forcing air through a pair of phonic lips (also known as "monkey lips" or " museau de singe ") at the front end of the nose, just below the blowhole. The sound then travels backwards along the length of the nose through the spermaceti organ. Most of

3808-546: The spine by flexible cartilage, which allows the ribcage to collapse rather than snap under high pressure. While sperm whales are well adapted to diving, repeated dives to great depths have long-term effects. Bones show the same avascular necrosis that signals decompression sickness in humans. Older skeletons showed the most extensive damage, whereas calves showed no damage. This damage may indicate that sperm whales are susceptible to decompression sickness, and sudden surfacing could be lethal to them. Like that of all cetaceans,

3876-410: The spine of the sperm whale has reduced zygapophysial joints , of which the remnants are modified and are positioned higher on the vertebral dorsal spinous process, hugging it laterally, to prevent extensive lateral bending and facilitate more dorso-ventral bending. These evolutionary modifications make the spine more flexible but weaker than the spines of terrestrial vertebrates. Like many cetaceans,

3944-411: The surface and points forward and left at a 45° angle. On average, females and juveniles blow every 12.5 seconds before dives, while large males blow every 17.5 seconds before dives. A sperm whale killed 160 km (100 mi) south of Durban, South Africa, after a 1-hour, 50-minute dive was found with two dogfish ( Scymnodon sp.), usually found at the sea floor , in its belly. The sperm whale has

4012-399: The valid name, limiting catodon 's status to a lesser synonym. Until 1974, the species was generally known as P. catodon . In that year, however, Dutch zoologists Antonius M. Husson and Lipke Holthuis proposed that the correct name should be P. macrocephalus , the second name in the genus Physeter published by Linnaeus concurrently with P. catodon . This proposition was based on

4080-505: The vessels of the brain. Their circulatory system has adapted to dive at great depths, as much as 2,250 metres (7,382 ft) for up to 120 minutes. More typical dives are around 400 metres (1,310 ft) and 35 minutes in duration. Myoglobin , which stores oxygen in muscle tissue, is much more abundant than in terrestrial animals. The blood has a high density of red blood cells , which contain oxygen-carrying haemoglobin . The oxygenated blood can be directed towards only

4148-450: The water as it begins a feeding dive. It has a series of ridges on the back's caudal third instead of a dorsal fin . The largest ridge was called the 'hump' by whalers, and can be mistaken for a dorsal fin because of its shape and size. In contrast to the smooth skin of most large whales, its back skin is usually wrinkly and has been likened to a prune by whale-watching enthusiasts. Albinos have been reported. The ribs are bound to

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4216-434: The weather of the peninsula. Shiretoko Peninsula has short summers and long winters. The current causes fog on the southeastern coast and sea ice in the winter. Snow covers the peaks from September to June, except the very highest peaks, which retain snow all summer long. The strong subarctic ocean current makes it difficult for boats to navigate. On April 23, 2022, a 19-ton tourist boat with 26 people on board sank during

4284-425: The whale derives its name. Spermaceti was a prime target of the whaling industry and was sought after for use in oil lamps, lubricants, and candles. Ambergris , a solid waxy waste product sometimes present in its digestive system, is still highly valued as a fixative in perfumes , among other uses. Beachcombers look out for ambergris as flotsam . Sperm whaling was a major industry in the 19th century, depicted in

4352-418: The whale's spermaceti organ using only the sound of its clicks. Because the interval between pulses of a sperm whale's click is related to the length of the sound producing organ, an individual whale's click is unique to that individual. However, if the whale matures and the size of the spermaceti organ increases, the tone of the whale's click will also change. The lower jaw is the primary reception path for

4420-1172: The world, officially uses Physeter macrocephalus when publishing their definitive list of marine mammal species . The sperm whale is the largest toothed whale and is among the most sexually dimorphic of all cetaceans . Both sexes are about the same size at birth, but mature males are typically 30% to 50% longer and three times as massive as females. Newborn sperm whales are usually between 3.7 and 4.3 meters (12 and 14 ft) long. Female sperm whales are sexually mature at 8 to 9 meters (26 to 30 ft) in length, whilst males are sexually mature at 11 to 12 meters (36 to 39 ft). Female sperm whales are physically mature at about 10.6 to 11 meters (35 to 36 ft) in length and generally do not achieve lengths greater than 12 metres (39 ft). The largest female sperm whale measured up to 12.3 meters (40 ft) long, and an individual of such size would have weighed about 17 tonnes (19 short tons). Male sperm whales are physically mature at about 15 to 16 meters (49 to 52 ft) in length, and larger males can generally achieve 18 to 19 meters (59 to 62 ft). An 18 meters (59 ft) long male sperm whale

4488-407: The years, probably due to pressure from whaling. Another view holds that exploitation by overwhaling had virtually no effect on the size of the bull sperm whales, and their size may have actually increased in current times on the basis of density dependent effects. Old males taken at Solander Islands were recorded to be extremely large and unusually rich in blubbers. The sperm whale's unique body

4556-408: Was designated Shiretoko National Park . Since then, the park has been subject to strict regulation as a nature preserve, and entering is prohibited. Sperm whale The sperm whale or cachalot ( Physeter macrocephalus ) is the largest of the toothed whales and the largest toothed predator . It is the only living member of the genus Physeter and one of three extant species in

4624-489: Was near Berkhey. The sperm whale is one of the species originally described by Carl Linnaeus in his landmark 1758 10th edition of Systema Naturae . He recognised four species in the genus Physeter . Experts soon realised that just one such species exists, although there has been debate about whether this should be named P. catodon or P. macrocephalus , two of the names used by Linnaeus. Both names are still used, although most recent authors now accept macrocephalus as

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