Wolverine

"Gulo" redirects here. For the enzyme and gene, see L-gulonolactone oxidase.
This article is about the animal. For other uses, see Wolverine (disambiguation).
Wolverine
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Mustelidae
Subfamily: Mustelinae
Genus: Gulo
Pallas, 1780
Species: G. gulo
Binomial name
Gulo gulo
(Linnaeus, 1758)
Subspecies

G. g. luscus
G. g. gulo

Wolverine ranges

The wolverine (/ˈwʊlvəriːn/), Gulo gulo (Gulo is Latin for "glutton"), also referred to as the glutton, carcajou, skunk bear, or quickhatch, is the largest land-dwelling species of the family Mustelidae (weasels). It is a stocky and muscular carnivore, more closely resembling a small bear than other mustelids. The wolverine, a solitary animal,[1] has a reputation for ferocity and strength out of proportion to its size, with the documented ability to kill prey many times larger than itself.

The wolverine can be found primarily in remote reaches of the Northern boreal forests and subarctic and alpine tundra of the Northern Hemisphere, with the greatest numbers in northern Canada, the U.S. state of Alaska, the Nordic countries of Europe, and throughout western Russia and Siberia. Its population has experienced a steady decline since the 19th century in the face of trapping, range reduction and habitat fragmentation, to the extent that the wolverine is now essentially absent from the southern end of its European range.

Taxonomy

Wolverine skull from the Pleistocene of Germany at the Museum für Naturkunde, Berlin

Genetic evidence suggests that the wolverine is most closely related to the tayra and martens (scientific names Eira and Martes, respectively), all of which shared a Eurasian ancestor.[2]

Within the Gulo genus, a clear separation occurs between two subspecies: the Old World form Gulo gulo gulo and the New World form G. g. luscus. Some authors had described as many as four additional North American subspecies, including ones limited to Vancouver Island (G. g. vancouverensis) and the Kenai Peninsula in Alaska (G. g. katschemakensis). However, the most currently accepted taxonomy recognizes either the two continental subspecies or recognize G. gulo as a single Holarctic taxon.[1][3]

Recently compiled genetic evidence suggests most of North America's wolverines are descended from a single source, likely originating from Beringia during the last glaciation and rapidly expanding thereafter, though considerable uncertainty to this conclusion is due to the difficulty of collecting samples in the extremely depleted southern extent of the range.[3]

Physical characteristics

Skull, as illustrated by N.N. Kondakov
Skeleton

Anatomically, the wolverine is a stocky and muscular animal. With short legs, broad and rounded head, small eyes and short rounded ears, it resembles a bear more than other mustelids. Though its legs are short, its large, five-toed paws and plantigrade posture facilitate movement through deep snow.[4]

The adult wolverine is about the size of a medium dog, with a length usually ranging from 65–107 cm (26–42 in), a tail of 17–26 cm (6.7–10.2 in), and a weight of 9–25 kg (20–55 lb), though exceptionally large males can weigh up to 32 kg (71 lb).[5][6][7] The males are as much as 30% larger than the females and can be twice the females' weight. Shoulder height is reported from 30 to 45 cm (12 to 18 in).[8] It is the largest of terrestrial mustelids; only the marine-dwelling sea otter, the giant otter of the Amazon basin and the semi-aquatic African clawless otter are larger, while hog badger may reach a similar size.

Wolverines have thick, dark, oily fur which is highly hydrophobic, making it resistant to frost. This has led to its traditional popularity among hunters and trappers as a lining in jackets and parkas in Arctic conditions. A light-silvery facial mask is distinct in some individuals, and a pale buff stripe runs laterally from the shoulders along the side and crossing the rump just above a 25–35 cm (9.8–13.8 in) bushy tail. Some individuals display prominent white hair patches on their throats or chests.[4]

Like many other mustelids, it has potent anal scent glands used for marking territory and sexual signaling. The pungent odor has given rise to the nicknames "skunk bear" and "nasty cat." Wolverines, like other mustelids, possess a special upper molar in the back of the mouth that is rotated 90 degrees, towards the inside of the mouth. This special characteristic allows wolverines to tear off meat from prey or carrion that has been frozen solid.[9][10]

Behavior

Video of a wolverine in the Helsinki Zoo

Diet and hunting

The wolverine is a powerful and versatile predator and scavenger. Prey mainly consists of small to medium-sized mammals, but the wolverine has been recorded killing prey such as adult deer that are many times larger than itself. Prey species include porcupines, squirrels, beavers, marmots, rabbits, voles, mice, shrews, lemmings, caribou, roe deer, white-tailed deer, mule deer, sheep, moose, and elk.[11] Smaller predators are occasionally preyed on, including martens, mink, foxes, Eurasian lynx,[12] weasels,[12] and coyote and wolf pups. Wolverines have also been known to kill Canadian lynx in the Yukon of Canada.[13] Wolverines often pursue live prey that are relatively easy to obtain, including animals caught in traps, newborn mammals, and deer (including adult moose and elk) when they are weakened by winter or immobilized by heavy snow. Their diets are sometimes supplemented by birds' eggs, birds (especially geese), roots, seeds, insect larvae, and berries. A majority of the wolverine's sustenance is derived from carrion, on which they depend almost exclusively in winter and early spring. Wolverines may find carrion themselves, feed on it after the predator is done feeding (especially wolf packs) or simply take it from another predator. Whether eating live prey or carrion, the wolverine's feeding style appears voracious, leading to the nickname of "glutton" (also the basis of the scientific name). However, this feeding style is believed to be an adaptation to food scarcity, especially in winter.[14]

Armed with powerful jaws, sharp claws, and a thick hide,[15] wolverines, like most mustelids, are remarkably strong for their size. They may defend kills against larger or more numerous predators such as wolves or bears.[16] At least one account reported a wolverine's apparent attempt to steal a kill from a black bear, although the bear won what was ultimately a fatal contest.[17] In another account, a wolverine killed a polar bear.[18][19] Wolverines are known to follow wolf and lynx trails, purportedly with the intent of scavenging the remains of their kills. Wolves are thought to be their most important natural predator, with the arrival of wolves to a wolverine's territory presumably leading the latter to abandon the area.[7]

Wolverines inhabiting the Old World (specifically, Fennoscandia) hunt more actively than their North American relatives.[20] This may be because competing predator populations in Eurasia are not as dense, making it more practical for the wolverine to hunt for itself than to wait for another animal to make a kill and then try to snatch it. They often feed on carrion left by wolves, so changes in wolf populations may affect the population of wolverines.[21] They are also known on occasion to eat plant material.[22]

Wolverines frequently cache their food during times of plenty. This is of particular importance to lactating females in the winter and early spring, a time when food is scarce.[23]

Mating and reproduction

Successful males will form lifetime relationships with two or three females, which they will visit occasionally, while other males are left without a mate.[24] Mating season is in the summer, but the actual implantation of the embryo (blastocyst) in the uterus is stayed until early winter, delaying the development of the fetus. Females will often not produce young if food is scarce. The gestation period is 30–50 days, and litters of typically two or three young ("kits") are born in the spring. Kits develop rapidly, reaching adult size within the first year of a lifespan that may reach anywhere from five to (in exceptional individuals) 13 years. Fathers make visits to their offspring until they are weaned at 10 weeks of age; also, once the young are about six months old, some reconnect with their fathers and travel together for a time.[24]

Distribution

Wolverine on rocky terrain

Wolverines live primarily in isolated arctic and alpine regions of northern Canada, Alaska, Siberia, and Scandinavia; they are also native to European Russia, the Baltic countries, the Russian Far East, northeast China and Mongolia. In 2008 and 2009, wolverines were sighted as far south as the Sierra Nevada, near Lake Tahoe, for the first time since 1922.[25][26][27] They are also found in low numbers in the Rocky Mountains and northern Cascades of the United States, and have been sighted as far south and east as Michigan.[28] However, most New World wolverines live in Canada.[22]

Conservation

The world's total wolverine population is not known. The animal exhibits a low population density and requires a very large home range.[21]

The range of a male wolverine can be more than 620 km2 (240 mi2), encompassing the ranges of several females which have smaller home ranges of roughly 130–260 km2 (50–100 mi2). Adult wolverines try for the most part to keep nonoverlapping ranges with adults of the same sex.[10] Radio tracking suggests an animal can range hundreds of miles in a few months.

Female wolverines burrow into snow in February to create a den, which is used until weaning in mid-May. Areas inhabited nonseasonally by wolverines are thus restricted to zones with late-spring snowmelts. This fact has led to concern that global warming will shrink the ranges of wolverine populations.[24]

This requirement for large territories brings wolverines into conflict with human development, and hunting and trapping further reduce their numbers, causing them to disappear from large parts of their former range; attempts to have them declared an endangered species have met with little success.[21] In February 2013, the United States Fish and Wildlife Service proposed giving Endangered Species Act protections to the wolverine due to its winter habitat in the northern Rockies diminishing. This was as a result of a lawsuit by brought by the Center for Biological Diversity and Defenders of Wildlife.[29]

The Wildlife Conservation Society reported in June 2009 that a wolverine researchers had been tracking for almost three months had crossed into northern Colorado. Society officials had tagged the young male wolverine in Wyoming near Grand Teton National Park and it had traveled southward for about 500 miles. It was the first wolverine seen in Colorado since 1919, and its appearance was also confirmed by the Colorado Division of Wildlife.[30] In February 2014, a wolverine was seen in Utah, the first confirmed sighting in that state in 30 years.[31]

Country Population Area Year State of population
Sweden 265+[4] Norrbotten[4] 1995–97[4] Stable[4]
Norway 150+[4] Snøhetta plateau and North[4] 1995–97[4] Decline[4]
Finland 155–170[4] Karelia and North[4] 2008[4] Stable[4]
Russia 1500[4] Taiga[4] 1970, 1990,[4] Decline[4]
Russia – Komi 885[4] – 1990[4] –
Russia – Archangelsk Oblast 410[4] Nenetsky Autonomous Area[4] 1990[4] Limited[4]
Russia – Kola Peninsula 160[4] Hunting Districts[4] 1990[4] Decline[4]
United States – Alaska[32] Unknown[32] Kobuk Valley National Park,[32] Selawik National Wildlife Refuge[32] 1998[32] Decline[32]
United States – Alaska[33] 3.0 (± 0.4 SE) wolverines/1,000 km2[33] Turnagain Arm and the Kenai Mountains[33] 2004[33] –[33]
United States – Rocky Mountains[34] 28–52[34] Montana, Idaho, Wyoming[34] 1989–2007[34] Unknown[34]
United States – California[35] 3[35] Tahoe National Forest[35] 2008[35] Unknown[35]
Canada – Yukon 9.7 (± 0.6 SE) wolverines/1,000 km2[33] Old Crow Flats[33] 2004[33] –[33]
Canada – Ontario[36] Unclear[36] Red Lake – Sioux Lookout to Fort Severn – Peawanuck[36] 2004[36] Stable to expanding[36]
Canada – Overall[37] 15,000–19,000[37] Overall[37] –[37] Stable[37]

In captivity

Captive at the Kristiansand Zoo, Norway

Around a hundred wolverines are held in zoos across North America and Europe, and they have been bred in captivity, but only with difficulty and high infant mortality.[38]

Name

The wolverine's questionable reputation as an insatiable glutton (reflected in the Latin genus name Gulo) may be in part due to a false etymology. The animal's name in older Norwegian, fjeldfross, meaning "mountain cat", is thought to have worked its way into German as Vielfrass,[39] which means "glutton" (literally "devours much"). Its name in other West Germanic languages is similar (e.g. Dutch: veelvraat).

The Finnish name is ahma, derived from ahmatti, which is translated as "glutton". Similarly, the Estonian name is ahm, with the equivalent meaning to the Finnish name. In Lithuanian is ernis, in Latvian—tinis or āmrija.

The Eastern Slavic росомаха (rosomakha) and the Polish and Czech name rosomák seem to be borrowed from the Finnish rasva-maha (fat belly). Similarly, the Hungarian name is rozsomák or torkosborz which means "gluttonous badger".

In French-speaking parts of Canada, the wolverine is referred to as carcajou, borrowed from the Innu-aimun or Montagnais kuàkuàtsheu.[40] However, in France, the wolverine's name is glouton (glutton).

Purported gluttony is reflected neither in the English name wolverine nor in the names used in North Germanic languages. The English word wolverine (alteration of the earlier form wolvering of uncertain origin) probably implies "a little wolf". The name in Proto-Norse, erafaz and Old Norse, jarfr, lives on in the regular Icelandic name jarfi, regular Norwegian name jerv, regular Swedish name järv and regular Danish name jærv.

In culture

The Wolverine pendant of Les Eyzies, when wolverines were still found in southern France

Many cities, teams, and organizations use the wolverine as a mascot. For example, the US state of Michigan is, by tradition, known as "the Wolverine State", and the University of Michigan takes the wolverine as its mascot. The association is well and long established: for example, many Detroiters volunteered to fight during the American Civil War and George Armstrong Custer, who led the Michigan Brigade, called them the "Wolverines". The origins of this association are obscure; it may derive from a busy trade in wolverine furs in Sault Ste. Marie in the 18th century or may recall a disparagement intended to compare early settlers in Michigan with the vicious mammal. Wolverines are, however, extremely rare in Michigan. A sighting in February 2004 near Ubly was the first confirmed sighting in Michigan in 200 years.[41] The animal was found dead in 2010[42] and the story recounted in the book The Lone Wolverine.[43]

The wolverine figures prominently in the mythology of the Innu people of eastern Québec and Labrador. In at least one Innu myth, it is the creator of the world.[44]

Wolverine is the name of a popular fictional character appearing in X-Men books published by Marvel Comics—named for his highly individualistic and aggressive behavior, as well as his great ferocity despite his small stature.

Film

The 91-minute 1994 motion picture Running Free (also known as One Paw) is about a young boy and his friendship with an Alaskan wolverine. The wolverines seen in the film were born in captivity and directed by a USDA-licensed filmmaker, Steve Kroschel. Many of the wolverine scenes are documentary footage of trained wolverines being filmed in their natural habitat. The movie was screened on 5 October 1994. The American Humane Society was involved before the start of filming and during some of the filming.[45]

The first full-length nature documentary about wild wolverines, Wolverines – Hyenas of the North, was produced in 2006 by German wildlife film company Gulo Film Productions for German Television (NDR), and has been broadcast in many countries – also under the titles Wolverine X or Wolverine Revealed,[46] and in the US by Animal Planet as an episode of Mutual of Omaha's Wild Kingdom. The film by German director Oliver Goetzl shows many different social behaviour aspects of wild wolverines at the Finnish / Russian border area – some of them previously unknown – and has won more than 30 international festival awards and nominations, including at Jackson Hole Wildlife Film Festival, Wildscreen Film Festival, IWFF Missoula, Animal Behavior Society Film Festival and Banff World Television Awards.

The PBS series Nature released a documentary, "Wolverine: Chasing the Phantom" as episode #166 on 14 November 2010.[47] This 53-minute documentary[48] focuses on the efforts of a number of naturalists in the United States to track wolverines, collect genetic data, and learn more about wolverine populations, individual behavior and social behavior. It also tracks the raising of two male wolverines in captivity at an Alaska nature reserve from birth to maturity, and profiles the naturalists making these efforts.

Gallery

References

  1. 1 2 3 Abramov, A., Belant, J. & Wozencraft, C. (2009). "Gulo gulo". IUCN Red List of Threatened Species. Version 2009.2. International Union for Conservation of Nature. Retrieved 2010-01-25.
  2. ↑ Koepfli, Klaus-Peter; Deere, KA; Slater, GJ; Begg, C; Begg, K; Grassman, L; Lucherini, M; Veron, G; Wayne, RK (February 2008). "Multigene phylogeny of the Mustelidae: Resolving relationships, tempo and biogeographic history of a mammalian adaptive radiation". BMC Biology 6: 10. doi:10.1186/1741-7007-6-10. PMC 2276185. PMID 18275614.
  3. 1 2 Tomasik, Eric and Cook, Joseph A. (2005). "Mitochondrial phylogeography and conservation genetics of wolverine (gulo gulo) of Northwestern North America". Journal of Mammalogy 86 (2): 386–396. doi:10.1644/BER-121.1.
  4. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Landa, Arild; Lindén, Mats and Kojola, Ilpo (2000). "Action Plan for the conservation of Wolverines (Gulo gulo) in Europe" (PDF). Nature and environment, No. 115. Convention on the Conservation of European Wildlife and Natural Habitats (Bern Convention). Retrieved 2008-01-25.
  5. ↑ "wolverine (mammal) – Britannica Online Encyclopedia". Britannica.com. Retrieved 2010-10-04.
  6. ↑ Burton, Maurice; Burton, Robert (1970). The international wildlife encyclopedia. Marshall Cavendish. pp. 2959–. ISBN 978-0-7614-7266-7. Retrieved 16 September 2011.
  7. 1 2 "Gulo gulo – The American Society of Mammalogists" (PDF). smith.edu. Retrieved 2011-09-23.
  8. ↑ Wolverine: Chasing the Phantom. Wolverine Facts. pbs.org
  9. ↑ Pratt, Philip. "Dentition of the Wolverine". The Wolverine Foundation, Inc. Archived from the original on 2008-05-27. Retrieved 2007-07-01.
  10. 1 2 Taylor, Ken (1994). "Wolverine". Wildlife Notebook Series. Alaska Department of Fish & Game. Retrieved 2007-01-21.
  11. ↑ Gulo gulo (wolverine), Animal Diversity Web
  12. 1 2 Heptner, V.G. and Sludskii, A.A. (1992). Mammals of the Soviet Union. Volume II Part 2 Carnivora: Hyenas and Cats. New Delhi: Amerind Publishing, p. 625
  13. ↑ Rockwood, Larry L (2015). Introduction to Population Ecology. Wiley. pp. 273–. ISBN 978-1-118-94755-5.
  14. ↑ Wolverine Gulo gulo, eNature.com
  15. ↑ "World Biomes: Wolverine". Blueplanetbiomes.org. Retrieved 2010-10-04.
  16. ↑ "Wolverine – Montana Fish, Wildlife & Parks". Montana Outdoors.
  17. ↑ "When Predators Attack (Each Other): Researchers Document First-known Killing of a Wolverine by a Black Bear In Yellowstone" (Press release). Science Daily. 2003-05-06. Retrieved 2007-01-16.
  18. ↑ Allardyce, Mark (2000). Wolverine – A Look Into the Devils Eyes. pp. 20, 165. ISBN 978-1-905361-00-7.
  19. ↑ Phelps, Gilbert (1989). Between man and beast: true tales & observations of the animal kingdom. Random House Value Publishing. p. 73. ISBN 0-517-69038-1.
  20. ↑ World Wildlife Fund–Sweden: 1st International Symposium on Wolverine Research and Management (PDF)
  21. 1 2 3 Glenn Hurowitz (2008-03-05). "First wolverine in 30 years spotted in California ", Grist.org; also US Forest Service (2008-03-06). "Camera Spots Wolverine in Sierra Nevada". physorg.com. Retrieved 2010-02-21.
  22. 1 2 Rickert, Eve (28 June 2007). "The perils of secrecy". High Country News.
  23. ↑ "Climate change could melt wolverines' snowy refrigerators". Live Science. Retrieved 2015-10-22.
  24. 1 2 3 Raloff, Janet (2010-10-21). "Wolverine: Climate warming threatens comeback". Science News (Society for Science & the Public) 178. Retrieved 2010-10-31.
  25. ↑ Knudson, Tom (5 April 2008). "Sighting prompts California to expand search for elusive wolverine". Sacramento Bee. Archived from the original on 30 July 2013.
  26. ↑ Griffith, Martin (22 March 2009). "A year later, wolverine spotted again in Sierra". San Francisco Chronicle. Archived from the original on 2009-04-26.
  27. ↑ Wolverine Sighting on SPI Land near Truckee. yubanet.com. 18 March 2009
  28. ↑ Runk, David. (2004-02-25). First Michigan wolverine spotted in 200 years – Technology & science – Science – msnbc.com. MSNBC. Retrieved on 2011-09-16.
  29. ↑ U.S. Proposes to Protect Wolverines February 1, 2013 New York Times
  30. ↑ "Wolverine confirmed in Colo., the first since 1919". Atlanta Journal Constitution. Associated Press. 19 June 2009. Archived from the original on 27 February 2014.
  31. ↑ Crofts, Natalie (July 2, 2014). "Wolverine caught on camera in Utah for 1st time". ksl.com.
  32. 1 2 3 4 5 6 Shults, Brad; Peltola, Gene; Belant, Jerrold and Kunkel, Kyran (1998). "population ecology of wolverines within Kobuk valley national park and Selawik national wildlife refuge". Rocky Mountain Research Station, US Department of Agriculture – Forest Service. Archived from the original on 2010-12-18. Retrieved 2008-01-26.
  33. 1 2 3 4 5 6 7 8 9 Goldena, Howard N.; Henryb, J. David; Beckera, Earl F.; Goldsteinc, Michael I.; Mortond, John M.; Frost, Dennis and Poef, Aaron J. (2007). "Estimating wolverine Gulo gulo population size using quadrat sampling of tracks in snow". Alaska Department of Fish and Game, Division of Wildlife Conservation; Parks Canada – Kluane National Park; US Forest Service – Alaska Regional Office; United States Fish and Wildlife Service, Kenai National Wildlife Refuge; North Yukon Renewable Resources Council; United States Forest Service, Chugach National Forest; 13: 52. doi:10.2981/0909-6396(2007)13[52:EWGGPS]2.0.CO;2.
  34. 1 2 3 4 5 Schwartz, Michael K.; Copeland, Jeffrey P.; Anderson, Neil J.; Squires, John R.; Inman, Robert M.; McKelvey, Kevin S.; Pilgrim, Kristy L.; Waits, Lisette P. and Cushman, Samuel A. (2010). "Wolverine gene flow across a narrow climatic niche" (PDF). Ecology 90:3222–3232. Ecological Society of America. Retrieved 2010-10-14.
  35. 1 2 3 4 5 "Wolverines in California – California Department of Fish and Game". Dfg.ca.gov. Archived from the original on 2015-01-18. Retrieved 2012-09-15.
  36. 1 2 3 4 5 Magoun, Audrey; Dawson, Neil; Lipsett-Moore, Geoff; Ray, Justina C. (2004). "Boreal Wolverine: A Focal Species for Land Use planning in Ontario's Northern Boreal Forest – Project Report" (PDF). The Wolverine Foundation, Inc., Ontario Ministry of Natural Resources, Ontario Parks, Wildlife Conservation Society (WCS)/University of Toronto. Archived from the original (PDF) on 2010-11-04. Retrieved 2008-01-26.
  37. 1 2 3 4 5 Slough, Brian; et al. (May 2003). "COSEWIC Assessment and Update Status Report on the Wolverine (Gulo gulo) – Eastern Population Western Population in Canada" (PDF). COSEWIC (committee on the status of endangered wildlife in Canada) 2003. COSEWIC assessment and update status report on the wolverine Gulo gulo in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. vi + 41 pp. Retrieved 2008-01-26.
  38. ↑ "Gulo gulo – Wolverine". International Species Identification System. May 2010. Retrieved 2010-05-09.
  39. ↑ Duden (in German)
  40. ↑ "The Free Dictionary". The Free Dictionary. Retrieved 2010-10-04.
  41. ↑ Runk, David (25 Feb 2004). "First Michigan wolverine spotted in 200 years". Associated Press. Retrieved 23 Dec 2008.
  42. ↑ Bell, Dawson (2010-03-15). "Only known wolverine in the Michigan wild dies". Detroit Free Press.
  43. ↑ Shaw, Elizabeth Phillips (2012). The Lone Wolverine: Tracking Michigan's Most Elusive Animal. University of Michigan Press. ISBN 978-0472118397.
  44. ↑ Armitage, Peter (1992). "Religious ideology among the Innu of eastern Quebec and Labrador" (PDF). Religiologiques 6. Archived from the original (PDF) on 1 January 2007. Retrieved 2007-06-29. (PDF)
  45. ↑ Synertech International Corp. (1994-10-05). "American Humane Society Film Review". Ahafilm.info. Retrieved 2010-10-04.
  46. ↑ "Animal Planet :: Wolverine Revealed". Animal.discovery.com. Archived from the original on 2013-05-07. Retrieved 2012-09-15.
  47. ↑ Wolverine: Chasing the Phantom. IMDB.com
  48. ↑ Wolverine: Chasing the Phantom | Nature | PBS Video. Video.pbs.org (14 November 2010). Retrieved on 2011-09-16.

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