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Dhole

From Wikipedia, the free encyclopedia
(Redirected fromCuon)
Species of mammal
"Mountain wolf" redirects here. For other uses, seeMountain wolf (disambiguation).
Not to be confused withRed wolf,Northern Rocky Mountain wolf, orAfrican wild dog.

Dhole
Temporal range:Middle Pleistocene – Recent0.78–0 Ma
CITES Appendix II (CITES)[1]
Scientific classificationEdit this classification
Domain:Eukaryota
Kingdom:Animalia
Phylum:Chordata
Class:Mammalia
Order:Carnivora
Family:Canidae
Subfamily:Caninae
Tribe:Canini
Genus:Cuon
Hodgson, 1838
Species:
C. alpinus
Binomial name
Cuon alpinus
(Pallas, 1811)
Subspecies
      dhole range
Synonyms

Canis alpinus

Thedhole (/dl/dohl;[2][3]Cuon alpinus) is acanid native toSouth,East andSoutheast Asia. It is anatomically distinguished from members of the genusCanis in several aspects: itsskull is convex rather than concave in profile, it lacks a third lowermolar and the upper molars possess only a singlecusp as opposed to between two and four. During thePleistocene, the dhole ranged throughoutAsia, with its range also extending intoEurope (with a single putative, controversial record also reported fromNorth America) but became restricted to its historical range 12,000–18,000 years ago. It is now extinct inCentral Asia, parts ofSoutheast Asia, and possibly theKorean peninsula andRussia.

Genetic evidence indicates that the dhole was the result ofreticulate evolution, emerging from thehybridization between a species closely related to genusCanis and from a lineage closely related to theAfrican wild dog (Lycaon pictus).

The dhole is a highly social animal, living in large clans without rigiddominance hierarchies and containing multiple breeding females. Such clans usually consist of about 12 individuals, but groups of over 40 are known. It is a diurnal pack hunter which preferentially targets large and medium-sizedungulates. In tropical forests, the dhole competes with thetiger (Panthera tigris) and theleopard (Panthera pardus), targeting somewhat different prey species, but still with substantial dietary overlap.

It is listed asEndangered on theIUCN Red List, as populations are decreasing and estimated to comprise fewer than 2,500 mature individuals. Factors contributing to this decline include habitat loss, loss of prey, competition with other species, persecution due to livestock predation, and disease transfer fromdomestic dogs.

Etymology and naming

[edit]

Theetymology of "dhole" is unclear. The possible earliest written use of the word in English occurred in 1808 by soldier Thomas Williamson, who encountered the animal inRamghur district,India. He stated thatdhole was a common local name for the species.[4] In 1827,Charles Hamilton Smith claimed that it was derived from a language spoken in 'various parts of the East'.[5]

Two years later, Smith connected this word withTurkish:deli 'mad, crazy', and erroneously compared the Turkish word withOld Saxon:dol andDutch:dol (cfr. also English:dull;German:toll),[6] which are in fact from theProto-Germanic *dwalaz 'foolish, stupid'.[7]Richard Lydekker wrote nearly 80 years later that the word was not used by the natives living within the species' range.[8] TheMerriam-WebsterDictionary theorises that it may have come from theKannada:ತೋಳ,romanized: tōḷa,lit.'wolf'.[9]

Other English names for the species includeAsian wild dog,Asiatic wild dog,[10]Indian wild dog,[8]whistling dog,red dog,[11] andred wolf.[12]

Taxonomy and evolution

[edit]
Skeletal remains of aEuropean dhole dating back to the upperWürm period from Cova Negra deXàtiva,Valencia, Spain
Illustration (1859) byLeopold von Schrenck, one of the first accurate depictions of the species, based on a single skin purchased in the village of Dshare on theAmur[13]

Canis alpinus was thebinomial name proposed byPeter Simon Pallas in 1811, who described its range as encompassing the upper levels of Udskoi Ostrog inAmurland, towards the eastern side and in the region of the upperLena River, around theYenisei River and occasionally crossing intoChina.[14][15] This northern Russian range reported by Pallas during the 18th and 19th centuries is "considerably north" of where this species occurs today.[15]

Canis primaevus was a name proposed byBrian Houghton Hodgson in 1833 who thought that the dhole was a primitiveCanis form and theprogenitor of thedomestic dog.[16] Hodgson later took note of the dhole's physical distinctiveness from the genusCanis and proposed the genusCuon.[17]

The first study on the origins of the species was conducted by paleontologist Erich Thenius, who concluded in 1955 that the dhole was a post-Pleistocene descendant of a golden jackal-like ancestor.[18] The paleontologistBjorn Kurten wrote in his 1968 bookPleistocene Mammals of Europe that the primitive dholeCanis majori Del Campana 1913 —the remains of which have been found inVillafranchian eraValdarno, Italy and in China—was almost indistinguishable from the genusCanis. In comparison, the modern species has greatly reducedmolars and thecusps have developed into sharply trenchant points. During the EarlyMiddle Pleistocene there arose bothCanis majori stehlini that was the size of a largewolf, and the early dholeCanis alpinus Pallas 1811 which first appeared atHundsheim andMosbach in Germany. In theLate Pleistocene era theEuropean dhole (C. a. europaeus) was modern-looking and the transformation of the lower molar into a single cusped, slicing tooth had been completed; however, its size was comparable with that of a wolf. This subspecies became extinct in Europe at the end of the lateWürm period, but the species as a whole still inhabits a large area of Asia.[19] The European dhole may have survived up until the earlyHolocene in theIberian Peninsula,[20] and what is believed to be dhole remains have been found at Riparo Fredian in northernItaly dated 10,800 years old.[21][22]

The vast Pleistocene range of this species also included numerous islands in Asia that this species no longer inhabits, such asSri Lanka,Borneo and possiblyPalawan in thePhilippines.[23][24][25][26][27][28] Middle Pleistocene dhole fossils have also been found in the Matsukae Cave in northernKyushu Island in westernJapan and in the Lower Kuzuu fauna inTochigi Prefecture inHonshu Island, east Japan.[29] Dhole fossils from the Late Pleistocene dated to about 10,700 years before present are known from theLuobi Cave or Luobi-Dong cave inHainan Island insouth China where they no longer exist.[30] Additionally, fossils of canidae possibly belonging to dhole have been excavated fromDajia River inTaichung County, Taiwan.[31]

A single record of the dhole is known from North America. This consists of a jaw fragment and teeth ofLate Pleistocene age found in San Josecito Cave in northeast Mexico, dating to around 27–11,000 years ago.[32] Other researchers have either considered this record as "insufficient" or suggested that further corroboration is required for the definitive taxonomic attribution of these specimens.[33][34]

Phylogenetic tree of thewolf-like canids with timing in millions of years[a]

Dholes are also known from the Middle and Late Pleistocene fossil record of Europe.[35] In 2021, the analyses of themitochondrialgenomes extracted from the fossil remains of two extinct European dhole specimens from the Jáchymka cave,Czech Republic dated 35,000–45,000 years old indicate that these were geneticallybasal to modern dholes and possessed much greater genetic diversity.[22]

The dhole's distinctive morphology has been a source of much confusion in determining the species' systematic position among the Canidae.George Simpson placed the dhole in thesubfamily Simocyoninae alongside theAfrican wild dog and thebush dog, on account of all three species' similar dentition.[36] Subsequent authors, includingJuliet Clutton-Brock, noted greater morphological similarities to canids of the generaCanis,Dusicyon andAlopex than to eitherSpeothos orLycaon, with any resemblance to the latter two being due toconvergent evolution.[37]

Some authors consider the extinctCanissubgenusXenocyon as ancestral to both the genusLycaon and the genusCuon.[38][39][40][41]: p149  Subsequent studies on the canidgenome revealed that the dhole and African wild dog are closely related to members of the genusCanis.[42] This closeness toCanis may have been confirmed in a menagerie inMadras, where according to zoologistReginald Innes Pocock there is a record of a dhole that interbred with a golden jackal.[43] DNA sequencing of theSardinian dhole (Cynotherium sardous) an extinct small canine species formerly native to the island of Sardinia in the Mediterranean, and which has often been suggested to have descended fromXenocyon, has found that it is most closely related to the living dhole among canines.[44]

Admixture with the African wild dog

[edit]

In 2018,whole genome sequencing was used to compare all members (apart from the black-backed and side-striped jackals) of the genusCanis, along with the dhole and theAfrican wild dog (Lycaon pictus). There was strong evidence of ancientgenetic admixture between the dhole and the African wild dog. Today, their ranges are remote from each other; however, during thePleistocene era the dhole could be found as far west as Europe. The study proposes that the dhole's distribution may have once included theMiddle East, from where it may have admixed with the African wild dog inNorth Africa. However, there is no evidence of the dhole having existed in the Middle East nor North Africa,[45] though theLycaon was present in Europe during the Early Pleistocene, with its last record in the region dating to 830,000 years ago. Genetic evidence from the Sardinan dhole suggests that both Sardinian and modern dholes (which are estimated to have split from each other around 900,000 years ago) share ancestry from theLycaon lineage, but this ancestry is significantly higher in modern dholes than in the Sardinian dhole.[44]

Subspecies

[edit]

Historically, up to ten subspecies of dholes have been recognised.[46] As of 2005[update], seven subspecies are recognised.[47][48]

However, studies on the dhole'smtDNA andmicrosatellite genotype showed no clear subspecific distinctions. Nevertheless, two major phylogeographic groupings were discovered in dholes of the Asian mainland, which likely diverged during aglaciation event. One population extends from South, Central and North India (south of the Ganges) into Myanmar, and the other extends from India north of the Ganges into northeastern India, Myanmar, Thailand and the Malaysian Peninsula. The origin of dholes in Sumatra and Java is, as of 2005[update], unclear, as they show greater relatedness to dholes in India, Myanmar and China rather than with those in nearby Malaysia. However, theCanid Specialist Group of theInternational Union for the Conservation of Nature (IUCN) states that further research is needed because all of the samples were from the southern part of this species' range and theTien Shan subspecies has distinct morphology.[49]

In the absence of further data, the researchers involved in the study speculated that Javan and Sumatran dholes could have been introduced to the islands by humans.[50] Fossils of dhole from the earlyMiddle Pleistocene have been found inJava.[51]

SubspeciesImageTrinomial authorityDescriptionDistributionSynonyms
C. a. adjustusBurmese dhole,[43] Indian dholePocock, 1941[43]Reddish coat, short hair on the paws and black whiskers[52]Northeastern India and south of theGanges River, northern Myanmar[52]antiquus (Matthew & Granger, 1923),dukhunensis (Sykes, 1831)
C. a. alpinusUssuri dhole[12]

(nominate subspecies)

Pallas, 1811[14]Thick tawny red coat, greyish neck and ochre muzzle[52]East of the easternSayan Mountains, eastern Russia, northeastern Asia[52]
C. a. fumosus[53]Pocock, 1936[53]Luxuriant yellowish-red coat, dark back and grey neck[52]WesternSichuan, China and Mongolia. Southern Myanmar, Thailand, Laos, Cambodia, Vietnam, Malaysia andJava, Indonesia[52]infuscus (Pocock, 1936),javanicus (Desmarest, 1820)
C. a. hesperiusTien Shan dhole[12]Afanasjev and Zolotarev, 1935[54]Long yellow tinted coat, white underside and pale whiskers[52] Smaller thanC. a. alpinus, with wider skull and lighter-coloured winter fur.[12]Altai, Tian Shan and Pamir mountain ranges.[1] Currently considered to be extinct since 1946.[55][1]jason (Pocock, 1936)
C. a. laniger[53]Pocock, 1936[53]Full, yellowish-grey coat, tail not black but same colour as body[52]Southern Tibet, Himalayan Nepal, Sikkim, Bhutan and Kashmir[52]grayiformis (Hodgson, 1863),primaevus (Hodgson, 1833)
C. a. lepturus[53]Heude, 1892[56]Uniform red coat with thick underfur[52]South of theYangtze River, China[52]clamitans (Heude, 1892),rutilans (Müller, 1839),sumatrensis (Hodgson, 1833)
Sumatran dhole and Javan dholeC. a. sumatrensis[57]Hardwicke, 1821[58]Red coat and dark whiskers[52]Sumatra, Indonesia[52] Its range is highly fragmented with multiple protected areas in Sumatra and Java.[1]

Characteristics

[edit]
A dhole inKanha National Park, India
Dhole skull and molars illustrated bySt. George Mivart (1890)
Captive adult dhole

The dhole's general tone of the fur is reddish, with the brightest hues occurring in winter. In the winter coat, the back is clothed in a saturated rusty-red to reddish colour with brownish highlights along the top of the head, neck and shoulders. The throat, chest, flanks, and belly and the upper parts of the limbs are less brightly coloured, and are more yellowish in tone. The lower parts of the limbs are whitish, with dark brownish bands on the anterior sides of the forelimbs. The muzzle and forehead are greyish-reddish. The tail is very luxuriant and fluffy, and is mainly of a reddish-ocherous colour, with a dark brown tip. The summer coat is shorter, coarser and darker.[12] The dorsal and lateralguard hairs in adults measure 20–30 mm (0.79–1.18 in) in length. Dholes in theMoscow Zoo moult once a year from March to May.[11] Amelanistic individual was recorded in the northernCoimbatore Forest Division inTamil Nadu.[59]

The dhole has a wide and massive skull with a well-developedsagittal crest,[12] and itsmasseter muscles are highly developed compared to other canid species, giving the face an almosthyena-like appearance.[60] Therostrum is shorter than that of domestic dogs and most other canids.[11] It has six rather than seven lowermolars.[61] The upper molars are weak, being one third to one half the size of those of wolves and have only onecusp as opposed to between two and four, as is usual in canids,[12] an adaptation thought to improve shearing ability and thus speed of prey consumption. This may allow dholes to compete more successfully withkleptoparasites.[52] In terms of size, dholes average about 88–113 cm (35–44 in) in length (excluding a 41–50 cm (16–20 in) long tail), and stand around 42–50 cm (17–20 in) at the shoulders.[11] Adult females can weigh 10–17 kg (22–37 lb), while the slightly larger male may weigh 15–21 kg (33–46 lb). The mean weight of adults from three small samples was 15.1 kg (33 lb).[52][62]

In appearance, the dhole has been variously described as combining the physical characteristics of thegray wolf and thered fox,[12] and as being "cat-like" on account of its long backbone and slender limbs.[18]

Distribution and habitat

[edit]
Lone dhole strolling through the jungle inMudumalai National Park
Dhole inTadoba Andhari Tiger Reserve, Maharashtra, India

Historically, the dhole lived inSingapore and throughoutCentral Asia includingAfghanistan,Kyrgyzstan,Kazakhstan,Mongolia,Tajikistan andUzbekistan, though it is now considered to be regionally extinct in these regions.[1] Historical record inSouth Korea from theVeritable Records of the Joseon Dynasty also indicate that the dhole once inhabitedYangju inGyeonggi Province,[63] but it is now also extinct in South Korea,[1] with the last known capture reports in 1909 and 1921 fromYeoncheon ofGyeonggi Province.[64] The current presence of dholes inNorth Korea andPakistan is considered uncertain.[1] The dholes also once inhabited the alpine steppes extending intoKashmir to theLadakh area, though they disappeared from 60% of their historic range in India during the past century.[1] In India, Myanmar, Indochina, Indonesia and China, it prefers forested areas inalpine zones and is occasionally sighted inplains regions.[12]

In theBek-Tosot Conservancy of southernKyrgyzstan, the possible presence of the dholes was considered likely based on genetic samples collected in 2019.[65] This was the first record of dholes from the country in almost three decades.[65]

The dhole might still be present in theTunkinsky National Park in extreme southernSiberia nearLake Baikal.[66] It possibly still lives in thePrimorsky Krai province in far eastern Russia, where it was considered a rare and endangered species in 2004, with unconfirmed reports in the Pikthsa-Tigrovy Dom protected forest area; no sighting was reported in other areas since the late 1970s.[67][page needed]Currently, no other recent reports are confirmed of dholes being present inRussia,[55] so the IUCN considered them to be extinct in Russia.[1] However, the dhole might be present in the easternSayan Mountains and in theTransbaikal region; it has been sighted inTofalaria in theIrkutsk Oblast, theRepublic of Buryatia andZabaykalsky Krai.[55]

One pack was sighted in theQilian Mountains in 2006.[68]In 2011 to 2013, local government officials and herders reported the presence of several dhole packs at elevations of 2,000 to 3,500 m (6,600 to 11,500 ft) nearTaxkorgan Nature Reserve in theXinjiang Autonomous Region. Several packs and a female adult with pups were also recorded bycamera traps at elevations of around 2,500 to 4,000 m (8,200 to 13,100 ft) in Yanchiwan National Nature Reserve in the northernGansu Province in 2013–2014.[69]Dholes have been also reported in theAltyn-Tagh Mountains.[70]

In China'sYunnan Province, dholes were recorded inBaima Xueshan Nature Reserve in 2010–2011.[71] Dhole samples were obtained inJiangxi Province in 2013.[72]Confirmed records by camera-trapping since 2008 have occurred in southern and westernGansu province, southernShaanxi province, southernQinghai province, southern and westernYunnan province, westernSichuan province, the southernXinjiang Autonomous Region and in the SoutheasternTibet Autonomoous Region.[73] There are also historical records of dhole dating to 1521–1935 in Hainan Island, but the species is no longer present and is estimated to have become extinct around 1942.[30]

The dhole occurs in most of India south of the Ganges, particularly in the Central Indian Highlands and theWestern andEastern Ghats. It is also present inArunachal Pradesh,Assam,Meghalaya andWest Bengal and in theIndo-Gangetic Plain'sTerai region. Dhole populations in theHimalayas and northwest India are fragmented.[1]

In 2011, dhole packs were recorded by camera traps in theChitwan National Park.[74] Its presence was confirmed in theKanchenjunga Conservation Area in 2011 by camera traps.[75] In February 2020, dholes were sighted in theVansda National Park, with camera traps confirming the presence of two individuals in May of the same year. This was the first confirmed sighting of dholes inGujarat since 1970.[76]

InBhutan, the dhole is present inJigme Dorji National Park.[77][78]

InBangladesh, it inhabits forest reserves in theSylhet area, as well theChittagong Hill Tracts in the southeast. Recent camera trap photos in the Chittagong in 2016 showed the continued presence of the dhole.[79] These regions probably do not harbour a viable population, as mostly small groups or solitary individuals were sighted.[1]

InMyanmar, the dhole is present in several protected areas.[1] In 2015, dholes and tigers were recorded by camera-traps for the first time in the hill forests ofKaren State.[80]

Its range is highly fragmented in theMalaysian Peninsula,Sumatra,Java,Vietnam andThailand, with the Vietnamese population considered to be possibly extinct.[1] In 2014, camera trap videos in the montane tropical forests at 2,000 m (6,600 ft) in theKerinci Seblat National Park in Sumatra revealed its continued presence.[81] A camera trapping survey in theKhao Ang Rue Nai Wildlife Sanctuary in Thailand from January 2008 to February 2010 documented one healthy dhole pack.[82] In northernLaos, dholes were studied inNam Et-Phou Louey National Protected Area.[62] Camera trap surveys from 2012 to 2017 recorded dholes in the same Nam Et-Phou Louey National Protected Area.[83]

InVietnam, dholes were sighted only inPu Mat National Park in 1999, inYok Don National Park in 2003 and 2004; and inNinh Thuan Province in 2014.[84]

A disjunct dhole population was reported in the area ofTrabzon andRize in northeasternTurkey near the border withGeorgia in the 1990s.[85] This report was not considered to be reliable.[1] One single individual was claimed to have been shot in 2013 in the nearbyKabardino-Balkaria Republic of Russia in the centralCaucasus; its remains were analysed in May 2015 by a biologist from theKabardino-Balkarian State University, who concluded that the skull was indeed that of a dhole.[86] In August 2015, researchers from theNational Museum of Natural History and theKaradeniz Technical University started an expedition to track and document possible Turkish population of dhole.[87] In October 2015, they concluded that two skins of alleged dholes in Turkey probably belonged to dogs, pending DNA analysis of samples from the skins, and, having analysed photos of the skull of alleged dhole in Kabardino-Balkaria Republic of Russia, they concluded it was a grey wolf.[88]

Ecology and behaviour

[edit]

Dholes produce whistles resembling the calls of red foxes, sometimes rendered ascoo-coo. How this sound is produced is unknown, though it is thought to help in coordinating the pack when travelling through thick brush. When attacking prey, they emit screamingKaKaKaKAA sounds.[89] Other sounds include whines (food soliciting), growls (warning), screams, chatterings (both of which are alarm calls) and yapping cries.[90] In contrast to wolves, dholes do nothowl or bark.[12]

Dholes have a complexbody language. Friendly or submissive greetings are accompanied by horizontal lip retraction and the lowering of the tail, as well as licking. Playful dholes open their mouths with their lips retracted and their tails held in a vertical position whilst assuming a play bow. Aggressive or threatening dholes pucker their lips forward in a snarl and raise the hairs on their backs, as well as keep their tails horizontal or vertical. When afraid, they pull their lips back horizontally with their tails tucked and their ears flat against the skull.[91]

Social and territorial behaviour

[edit]

Dholes are more social thangray wolves,[12] and have less of a dominance hierarchy, as seasonal scarcity of food is not a serious concern for them. In this manner, they closely resemble African wild dogs in social structure.[92] They live inclans rather thanpacks, as the latter term refers to a group of animals that always hunt together. In contrast, dhole clans frequently break into small packs of three to five animals, particularly during the spring season, as this is the optimal number for catching fawns.[93] Dominant dholes are hard to identify, as they do not engage in dominance displays as wolves do, though other clan members will show submissive behaviour toward them.[94] Intragroup fighting is rarely observed.[95]

Dholes playing,Pench National Park
A pack of Asiatic wild dog

Dholes are far lessterritorial than wolves, with pups from one clan often joining another without trouble once they mature sexually.[96] Clans typically number 5 to 12 individuals in India, though clans of 40 have been reported. InThailand, clans rarely exceed three individuals.[11] Unlike other canids, there is no evidence of dholes usingurine to mark their territories or travel routes. When urinating, dholes, especially males, mayraise one hind leg or both to result in a handstand. Handstand urination is also seen inbush dogs (Speothos venaticus)[97] and domestic dogs.[98] They may defecate in conspicuous places, though a territorial function is unlikely, asfaeces are mostly deposited within the clan's territory rather than the periphery. Faeces are often deposited in what appear to be communallatrines. They do not scrape the earth with their feet, as other canids do, to mark their territories.[91]

Denning

[edit]

Four kinds of den have been described; simple earth dens with one entrance (usually remodeledstriped hyena orporcupine dens); complex cavernous earth dens with more than one entrance; simple cavernous dens excavated under or between rocks; and complex cavernous dens with several other dens in the vicinity, some of which are interconnected. Dens are typically located under dense scrub or on the banks of dry rivers or creeks. The entrance to a dhole den can be almost vertical, with a sharp turn three to four feet down. The tunnel opens into an antechamber, from which extends more than one passage. Some dens may have up to six entrances leading up to 30 m (98 ft) of interconnecting tunnels. These "cities" may be developed over many generations of dholes, and are shared by the clan females when raising young together.[99] LikeAfrican wild dogs anddingoes, dholes will avoid killing prey close to their dens.[100]

Reproduction and development

[edit]
Dhole pup,Kolmården Wildlife Park

In India, themating season occurs between mid-October and January, while captive dholes in theMoscow Zoo breed mostly in February.[11] Unlike wolf packs, dhole clans may contain more than one breeding female.[94] More than one female dhole may den and rear their litters together in the same den.[95] Duringmating, the female assumes a crouched, cat-like position. There is nocopulatory tie characteristic of other canids when the male dismounts. Instead, the pair lie on their sides facing each other in a semicircular formation.[101] Thegestation period lasts 60–63 days, with litter sizes averaging four to six pups.[11] Their growth rate is much faster than that of wolves, being similar in rate to that ofcoyotes.

Thehormone metabolites of five males and three females kept in Thai zoos was studied. The breeding males showed an increased level oftestosterone from October to January. Theoestrogen level of captive females increases for about two weeks in January, followed by an increase ofprogesterone. They displayed sexual behaviours during the oestrogen peak of the females.[102]

Pups are suckled at least 58 days. During this time, the pack feeds the mother at the den site. Dholes do not userendezvous sites to meet their pups as wolves do, though one or more adults will stay with the pups at the den while the rest of the pack hunts. Onceweaning begins, the adults of the clan will regurgitate food for the pups until they are old enough to join in hunting. They remain at the den site for 70–80 days. By the age of six months, pups accompany the adults on hunts and will assist in killing large prey such assambar by the age of eight months.[100] Maximum longevity in captivity is 15–16 years.[95]

Hunting behaviour

[edit]

Before embarking on a hunt, clans go through elaborate prehunt social rituals involving nuzzling, body rubbing and mounting.[103] Dholes are primarilydiurnal hunters, hunting in the early hours of the morning. They rarely hunt at night, except on moonlit nights, indicating they greatly rely onsight when hunting.[104] They can chase their prey for many hours.[12] During a pursuit, one or more dholes takes over chasing the prey, while the rest of the pack keeps up at a steadier pace behind, taking over once the other group tires. Most chases are short, lasting only 500 m (1,600 ft).[105] When chasing fleet-footed prey, they run at a pace of 50 km/h (30 mph).[12] Dholes frequently drive their prey into water bodies, where the targeted animal's movements are hindered.[106]

Dholes attacking asambar,Bandipur National Park

Once large prey is caught, one dhole grabs the prey's nose, while the rest of the pack pulls the animal down by the flanks and hindquarters. They do not use a killing bite to the throat.[107] They occasionally blind their prey by attacking the eyes.[108]Serows are among the only ungulate species capable of effectively defending themselves against dhole attacks, due to their thick, protective coats and short, sharp horns capable of easily impaling dholes.[8] Dholes tear open their prey's flanks anddisembowel it, eating theheart,liver,lungs and some sections of theintestines. Thestomach andrumen are usually left untouched.[109] Prey weighing less than 50 kg (110 lb) is usually killed within two minutes, while large stags may take 15 minutes to die. Once prey is secured, dholes tear off pieces of the carcass and eat in seclusion.[110] They give the pups access to a kill.[94] They are generally tolerant ofscavengers at their kills.[111] Both mother and young are provided with regurgitated food by other pack members.[95]

Feeding ecology

[edit]

Prey animals in India includechital,sambar deer,muntjac,mouse deer,barasingha,wild boar,gaur,water buffaloes,banteng,cattle,nilgai,goats,Indian hares,Himalayan field rats andlangurs.[11][43][112] There is one record of a pack bringing down anIndian elephant calf inAssam, despite desperate defense of the mother, resulting in numerous losses to the pack.[113] In Kashmir, they prey onmarkhor,[43] andthamin in Myanmar,[11]Malayan tapir,Sumatran serow inSumatra and theMalay Peninsula andJavan rusa in Java.[52] In theTian Shan andTarbagatai Mountains, dholes prey onSiberian ibexes,arkhar,roe deer,Caspian red deer andwild boar. In theAltai andSayan Mountains, they prey onmusk deer andreindeer. In eastern Siberia, they prey on roe deer,Manchurian wapiti, wild pig, musk deer and reindeer, while inPrimorye they feed onsika deer andgoral. In Mongolia, they prey onargali and rarely Siberian ibex.[12]

Dholes feeding on achital, Bandipur National Park
Dhole feeding onsambar deer carcass,Khao Yai National Park

Like African wild dogs, but unlike wolves, dholes are not known to actively hunt people.[12][43] They are known to eatinsects andlizards.[114] Dholes eatfruit andvegetable matter more readily than other canids. In captivity, they eat various kinds of grasses, herbs and leaves, seemingly for pleasure rather than just when ill.[115] In summertime in the Tian Shan Mountains, dholes eat large quantities of mountainrhubarb.[12] Although opportunistic, dholes have a seeming aversion to hunting cattle and their calves.[116]Livestock predation by dholes has been a problem in Bhutan since the late 1990s, as domestic animals are often left outside to graze in the forest, sometimes for weeks at a time. Livestock stall-fed at night and grazed near homes are never attacked.Oxen are killed more often thancows, probably because they are given less protection.[117]

Enemies and competitors

[edit]
Dhole killed and cached in a tree by aleopard, India

In some areas, dholes aresympatric totigers andleopards. Competition between these species is mostly avoided through differences in prey selection, although there is still substantial dietary overlap. Along with leopards, dholes typically target animals in the 30–175 kg (66–386 lb) range (mean weights of 35.3 kg (78 lb) for dhole and 23.4 kg (52 lb) for leopard), while tigers selected for prey animals heavier than 176 kg (388 lb) (but their mean prey weight was 65.5 kg (144 lb)). Also, other characteristics of the prey, such as sex, arboreality and aggressiveness, may play a role in prey selection. For example, dholes preferentially select male chital, whereas leopards kill both sexes more evenly (and tigers prefer larger prey altogether), dholes and tigers kill langurs rarely compared to leopards due to the leopards' greater arboreality, while leopards kill wild boar infrequently due to the inability of this relatively light predator to tackle aggressive prey of comparable weight.[118]

Tigers are dangerous opponents for dholes, as they have sufficient strength to kill a dhole with a single paw strike.[113] Dhole packs are smaller in areas with higher tiger densities due to tigers directly killing dholes and stealing kills they made. The kleptoparasitism causes dholes to prefer hunting smaller animals because they can eat more of a smaller carcass before a tiger arrives to steal it. Direct predation can lead to lower reproductive and recruitment rates, lower hunting success rates and less food for the pups when a helper is killed, and potentially pack destabilization if one member of the breeding pair is killed.[119]

Dhole packs may steal leopard kills, while leopards may kill dholes if they encounter them singly or in pairs.[43] There are numerous records of leopards being treed by dholes.[95] Dholes were once thought to be a major factor in reducingAsiatic cheetah populations, though this is doubtful, as cheetahs live in open areas as opposed to forested areas favoured by dholes.[120] Since leopards are smaller than tigers and are more likely to hunt dholes, dhole packs tend to react more aggressively toward them than they do towards tigers.[121]

Dhole packs occasionally attackAsiatic black bears,snow leopards andsloth bears. When attacking bears, dholes will attempt to prevent them from seeking refuge in caves and lacerate their hindquarters.[43]Although usually antagonistic towardwolves,[12] they may hunt and feed alongside one another.[122]

The dhole is also sympatric with theIndian wolf (Canis lupus pallipes) in parts of its range.[123][124] There is at least one record of a lone wolf associating with a pair of dholes inDebrigarh Wildlife Sanctuary,[125] and two observations inSatpura Tiger Reserve.[126] They infrequently associate in mixed groups withgolden jackals. Domestic dogs may kill dholes, though they will feed alongside them on occasion.[127]

Diseases and parasites

[edit]

Dholes are vulnerable to a number of different diseases, particularly in areas where they aresympatric with other canid species. Infectious pathogens such asToxocara canis are present in their faeces. They may suffer fromrabies,canine distemper,mange,trypanosomiasis,canine parvovirus andendoparasites such ascestodes androundworms.[52]

Threats

[edit]

Habitat loss is thought to amount to 60% of the dhole's historical range in India. The fragmentation and isolation of dhole populations has resulted in inbreeding and theAllee effect, which threaten its long-term viability.[128]

Some ethnic groups like theKuruba andMon Khmer-speaking tribes will appropriate dhole kills; some Indian villagers welcome the dhole because of this appropriation of dhole kills.[95] Dholes were persecuted throughout India for bounties until they were given protection by theWildlife Protection Act of 1972. Methods used for dhole hunting included poisoning, snaring, shooting and clubbing at den sites. Native Indian people killed dholes primarily to protect livestock, while British sporthunters during theBritish Raj did so under the conviction that dholes were responsible for drops ingame populations. Persecution of dholes still occurs with varying degrees of intensity according to the region.[52] Bounties paid for dholes used to be 25rupees, though this was reduced to 20 in 1926 after the number of presented dhole carcasses became too numerous to maintain the established reward.[129] The Indochinese dhole population suffers heavily from nonselective hunting techniques such assnaring.[52]Thefur trade does not pose a significant threat to the dhole.[52] The people of India do not eat dhole flesh and their fur is not considered overly valuable.[115] Due to their rarity, dholes were never harvested for their skins in large numbers in theSoviet Union and were sometimes accepted as dog or wolf pelts (being labeled as "half wolf" for the latter). The winter fur was prized by the Chinese, who bought dhole pelts inUssuriysk during the late 1860s for a few silverrubles. In the early 20th century, dhole pelts reached eight rubles inManchuria. InSemirechye,fur coats made from dhole skin were considered the warmest, but were very costly.[12]

Conservation

[edit]

In India, the dhole is protected under Schedule 2 of theWildlife Protection Act, 1972. The creation of reserves underProject Tiger provided some protection for dhole populations sympatric with tigers. In 2014, the Indian government sanctioned its first dhole conservation breeding centre at theIndira Gandhi Zoological Park (IGZP) inVisakhapatnam.[130] The dhole has been protected in Russia since 1974, though it is vulnerable to poison left out for wolves. In China, the animal is listed as a category II protected species under the Chinese wildlife protection act of 1988. InCambodia, the dhole is protected from all hunting, while conservation laws in Vietnam limit extraction and utilisation.[1]

In 2016, the Korean company Sooam Biotech was reported to be attempting to clone the dhole using dogs assurrogate mothers to help conserve the species.[131]

In culture and literature

[edit]
In ancient China, dholes were known and were also present in mythology
Drawing of a dhole from the Imperial Chinese Encyclopedia

Three dhole-like animals are featured on thecoping stone of theBharhutstupa dating from 100 BC. They are shown waiting by a tree, with a woman or spirit trapped up it, a scene reminiscent of dholestreeing tigers.[132] The animal's fearsome reputation in India is reflected by the number of pejorative names it possesses inHindi, which variously translate as "red devil", "devil dog", "jungle devil", or "hound ofKali".[113]

Leopold von Schrenck had trouble obtaining dhole specimens during his exploration ofAmurland, as the localGilyaks greatly feared the species. This fear and superstition was not, however, shared by neighbouringTungusic peoples. It was speculated that this differing attitude towards the dhole was due to the Tungusic peoples' more nomadic, hunter-gatherer lifestyle.[13]

Dholes appear inRudyard Kipling'sRed Dog, where they are portrayed as aggressive and bloodthirsty animals which descend from theDeccan Plateau into theSeeonee Hills inhabited byMowgli and his adopted wolf pack to cause carnage among the jungle's denizens. They are described as living in packs numbering hundreds of individuals, and that evenShere Khan andHathi make way for them when they descend into the jungle. The dholes are despised by the wolves because of their destructiveness, their habit of not living in dens and the hair between their toes. With Mowgli andKaa's help, the Seeonee wolf pack manages to wipe out the dholes by leading them through bee hives and torrential waters before finishing off the rest in battle.

Japanese author Uchida Roan wrote犬物語 (Inu monogatari; A dog's tale) in 1901 as anationalistic critique of the declining popularity of indigenous dog breeds, which he asserted were descended from the dhole.[133]

A fictional version of the dhole, imbued with supernatural abilities, appears in a sixth-season episode of TV seriesThe X-Files, titled "Alpha".

In China, the dhole were widely known throughout history and mythology. One notable legendary creature is theYazi (睚眦), which was believed to be a creature that was part-dhole, part-dragon. In modern times, however, the Chinese word for dhole (;Chái) is often confused with 'jackal' or 'wolf', resulting in many confusions and mistranslations of dholes as jackals or wolves.[134]

Dholes also appear as enemies in thevideo gameFar Cry 4, alongside other predators such as theBengal tiger,honey badger,snow leopard,clouded leopard,Tibetan wolf andAsian black bear. They can be found hunting the player and otherNPCs across the map, but are easily killed, being one of the weakest enemies in the game. They once again appear in the video gameFar Cry Primal, where they play similar roles as their counterparts in the previous game, but can now also be tamed and used in combat by Takkar, the main protagonist of the game.

Tameability

[edit]

Brian Houghton Hodgson kept captured dholes in captivity, and found, with the exception of one animal, they remained shy and vicious even after 10 months.[135] Adult dholes are nearly impossible to tame, though pups are docile and can even be allowed to play with domestic dog pups until they reach early adulthood.[8] A dhole may have been presented as a gift to the Akkadian kingIbbi-Sin as tribute referred to in the inscription as the "red dog of Meluhha" orIndus Valley Civilisation ofPakistan suggesting a once greater range of the dhole.[136]

See also

[edit]

Notes

[edit]
  1. ^For a full set of supporting references refer to the note (a) in the phylotree atEvolution of the wolf#Wolf-like canids

References

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Bibliography

[edit]

External links

[edit]
Look updhole in Wiktionary, the free dictionary.
ExtantCarnivora species
Prionodon(Asiatic linsangs)
Pantherinae
Neofelis
Panthera
Felinaesensu stricto
Bay cat
lineage
Pardofelis
Catopuma
Caracal
lineage
Caracal
Leopardus
Lynx
Puma
lineage
Acinonyx
Puma
Leopard cat
lineage
Prionailurus
Felis
Viverroidea
    • see below↓
Hemigalinae
Paradoxurinae
Paradoxurus
Viverrinaesensu lato
Viverrinae
sensu stricto
Viverra
Poiana
(African linsangs)
subgenusGenetta
(paraphyletic)
subgenusEugenetta
(paraphyletic)
subgenusHerpailuropoda
(paraphyletic)
subgenusPardogale
(paraphyletic)
subgenusPrionailuropoda
subgenusLeptailuropoda
(paraphyletic)
subgenusOsbornictis
Herpestoidea
    • see below↓
Hyaenidae
(hyenas)
Proteles
Hyaeninae
(bone-crushing hyenas)
Crocuta
Herpestidaesensu lato
Eupleridae
(Malagasy
carnivorans)
Euplerinae
(Malagasy civets)
Eupleres(falanoucs)
Galidiinae
(vontsira)
Galidictis
Salanoia
Suricata
Mungos
Helogale
Crossarchus
(kusimanses)
Urva
(Asian mongooses)
Bdeogale
Herpestes
(slender mongooses)
Urocyon
Nyctereutes
(raccoon dogs)
Vulpes
(truefoxes)
Speothos
Lycalopex
(South American foxes)
Lupulella
Lycaon
Canis
Ailuropoda
Tremarctos
Ursinae
Ursus
Mustelida
Pinnipedia(seals)
    • see below↓
Musteloidea
    • see below↓
Odobenidae
Callorhinus
(northernfur seals)
Otariinae
(sea lions)
Zalophus
Neophoca
Arctocephalus
(southernfur seals)
Phoca
Pusa
Monachini
(monk seals)
Neomonachus
Mirounga
(elephant seals)
Lobodontini
(Antarctic seals)
Ailuridae
Conepatus
(hog-nosed skunks)
Mephitis
Mydaus
(stink badgers)
Spilogale
(spotted skunks)
Bassariscus
Procyon
(raccoons)
Bassaricyon
(olingos)
Nasuina
(coatis)
Nasua
Nasuella
(mountain coatis)
Mustelidae
    • see below↓
Mellivora
Arctonyx
(hog badgers)
Meles
(Eurasian badgers)
Melogale
(ferret-badgers)
Pekania
Gulo
Martes
(martens)
Lyncodontini
Galictis
(grisons)
Ictonychini
(African polecats)
Vormela
Ictonyx
Lontra
Enhydra
Lutra
Lutrogale
Aonyx
Neogale
(New World weasels)
subgenusMustela
(paraphyletic)
subgenusLutreola
(paraphyletic)
subgenusPutorius
ExtinctCanidae
Hesperocyoninae
Osbornodon
Phlaocyonini
Phlaocyon
Cynarctina
Aelurodontina
Borophagina
Borophagus
Caninae
    • see below↓
Mesocyon

Aelurodon

Epicyon haydeni
Urocyon
Nyctereutes
(raccoon dogs)
Vulpes
(true foxes)
Cerdocyonina
(zorro)
Speothos
Dusicyon
Lycalopex
(South American foxes)
Canina(wolf-like canids)
    • see below↓
Nyctereutes donnezani

Vulpes praeglacialis

Falkland Islands wolf (Dusicyon australis)
Eucyon
Lycaon
Dhole (Cuon alpinus)
Coyote (C. latrans)
Red wolf (C. rufus)
Prehistoric
Recently
extinct
Dire wolf (Aenocyon dirus)

European dhole (Cuon alpinus europaeus)Mosbach wolf (Canis mosbachensis)

Cave wolf (Canis lupus spelaeus)
Cuon alpinus
Canis alpinus
Authority control databases: NationalEdit this at Wikidata
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