Ethiopian wolf

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Ethiopian wolf[1]
Temporal range: Late Pleistocene - Recent
Canis simensis.jpg
Southern Ethiopian wolf (C. s. citernii), Sanetti Plateau.
Conservation status
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Mammalia
Order:Carnivora
Family:Canidae
Genus:Canis
Species:C. simensis
Binomial name
Canis simensis
Ruppell, 1840
Ethiopian Wolf area.png
Ethiopian wolf range
 
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"Red jackal" redirects here. For other uses, see Red Jackal (disambiguation).
Ethiopian wolf[1]
Temporal range: Late Pleistocene - Recent
Canis simensis.jpg
Southern Ethiopian wolf (C. s. citernii), Sanetti Plateau.
Conservation status
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Mammalia
Order:Carnivora
Family:Canidae
Genus:Canis
Species:C. simensis
Binomial name
Canis simensis
Ruppell, 1840
Ethiopian Wolf area.png
Ethiopian wolf range

The Ethiopian wolf (Canis simensis) is a canid native to the Ethiopian Highlands. It is similar to the coyote in size and build, and is distinguished by its long and narrow skull, and its red and white fur.[3] Unlike most large canids, which are widespread, generalist feeders, the Ethiopian wolf is a highly specialised feeder of Afroalpine rodents with very specific habitat requirements.[4] It is the world's rarest canid, and Africa's most endangered carnivore.[5]

The species' current range is limited to seven isolated mountain ranges at altitudes of 3,000–4,500m, with the overall adult population estimated at 360-440 individuals in 2011, more than half of them in the Bale Mountains.[2]

The Ethiopian wolf is listed as Endangered by the IUCN, on account of its small numbers and fragmented range. Threats include increasing pressure from expanding human populations, resulting in habitat degradation through overgrazing and disease transference from free ranging dogs. Its conservation is headed by Oxford University's Ethiopian Wolf Conservation Programme (EWCP), which seeks to protect wolves through vaccination and community outreach programs.[2]

Naming[edit]

Alternative English names for the Ethiopian wolf include Abyssinian wolf, Simien fox, Simien jackal, Ethiopian jackal, red fox, red jackal,[6] Abyssinian dog[7] and cuberow.[8]

Indigenous names[edit]

Historical account[edit]

The earliest written reference to the species comes from the 13th century Aberdeen Bestiary:[5][10]

Rüppell's depiction of the species (1835).
OriginalTranslation
Lupos Ethiopia mittit, cervice iubatos et tanto varios ut nullum eis colorem dicunt abesse. Ethiopicis lupis proprium est, quod in saliendo ita nisus habent alitis, ut non magis proficient cursu quam meatu. Homines tamen numquam impetunt. Bruma comati sunt, aestate nudi. Ethiopes eos vocant theas.Ethiopia produces wolves with manes, so diversely coloured, men say, that no hue is lacking. A characteristic of Ethiopian wolves is that they leap so high that they seem to have wings, going further than they would by running. They never attack men, however. In winter, they grow long hair; in summer, they are hairless. The Ethiopians call them theas.
Mounted specimen (1902), one of the first post-1835 specimens to reach Europe.

The species was first scientifically described in 1835 by Eduard Rüppell,[11] who provided a skull for the British Museum.[8][12] European writers traveling in Ethiopia during the mid-19th century (then called Abyssinia) wrote that the animal's skin was never worn by natives, as it was popularly believed that the wearer would die should any wolf hairs enter an open wound,[13] while Charles Darwin hypothesised that the species gave rise to greyhounds.[14][b] Since then, it was scarcely heard of in Europe up until the early 20th century, when several skins were shipped to England by Major Percy Horace Gordon Powell-Cotton during his travels in Abyssinia.[8][12]

The Ethiopian wolf was recognised as requiring protection in 1938, and received it in 1974. The first in-depth studies on the species occurred in the 1980s, with the onset of the American sponsored Bale Mountains Research Project. Ethiopian wolf populations in the Bale Mountains National Park were negatively affected by the political unrest of the Ethiopian Civil War, though the critical state of the species was revealed during the early 1990s after a combination of shooting and a severe rabies epidemic decimated most packs studied in the Web Valley and Sanetti Plateau. In response, the IUCN reclassified the species from Endangered to Critically Endangered in 1994. The IUCN/SSC Canid Specialist Group advocated a three front strategy of education, wolf population monitoring, and rabies control in domestic dogs. The establishment of the Ethiopian Wolf Conservation Programme in Bale soon followed in 1995 by Oxford University, in conjunction with the Ethiopian Wildlife Conservation Authority (EWCA).[5]

Soon after, a further wolf population was discovered in the Central Highlands. Elsewhere, information on Ethiopian wolves remained scarce; although first described in 1835 as living in the Simien Mountains, the paucity of information stemming from that area indicated that the species was likely declining there, while reports from the Gojjam plateau were a century out of date. Wolves were recorded in the Arsi Mountains since the early 20th century, and in the Bale Mountains in the late 1950s. The status of the Ethiopian wolf was re-assessed in the late 1990s, following improvements in travel conditions into northern Ethiopia. The surveys taken revealed local extinctions in Mount Choqa, Gojjam, and in every northern Afroalpine region where agriculture is well developed and human pressure acute. This revelation stressed the importance of the Bale Mountains wolf populations for the species' long-term survival, as well as the need to protect other surviving populations. A decade after the rabies outbreak, the Bale populations had fully recovered to pre-epizootic levels, prompting the species' downlisting to Endangered in 2004, though it still remains the world's rarest canid, and Africa's most endangered carnivore.[5]

Taxonomy and evolution[edit]

Ethiopian wolf skull. Despite its close relation to the grey wolf, convergent evolution has resulted in a similar skull shape to that of jackals and the South American maned wolf.[16]

The Ethiopian wolf is one of five Canis species present in Africa, and is readily distinguishable from jackals by its larger size, relatively longer legs, distinct reddish coat and white markings. John Edward Gray and Glover Morrill Allen originally classified the species under a separate genus, Simenia,[17] and Oscar Neumann considered it to be "only an exaggerated fox".[18] Juliet Clutton-Brock refuted the separate genus in favour of placing the species in the genus Canis, upon noting cranial similarities with the side-striped jackal.[19]

Initial molecular evidence suggested that the Ethiopian wolf is a descendant of the grey wolf,[20] though more recent evidence suggests that this is not the case; although the Ethiopian wolf is closely related to grey wolves, coyotes and golden jackals, it probably diverged some 3-4 million years ago.[21](Fig. 10)





Side-striped jackal



Black-backed jackal








Golden jackal





Dog



Grey wolf




Coyote





Ethiopian wolf




Dhole





African wild dog






Although there are fossil records of wolf-like canids from Late Pleistocene Eurasia, there are no fossil records for the Ethiopian wolf itself. The species may have evolved from a wolf-like ancestor crossing into North Africa from Eurasia as early as 100,000 years ago.[17] Due to the high density of rodents in their new Afroalpine habitat, the ancestors of the Ethiopian wolf gradually developed into specialised rodent hunters. This specialisation is reflected in the animal's skull morphology, with its very elongated head, long jaw and widely spaced teeth. It was during this period that the species likely attained its highest abundance, and had a relatively continuous distribution. This changed approximately 15,000 years ago with the onset of the current interglacial, which caused the species' Afroalpine habitat to fragment, thus isolating Ethiopian wolf populations from each other.[4]

Subspecies[edit]

As of 2005,[1] two subspecies are recognised by MSW3.

Physical description[edit]

Painting (1926) by Louis Agassiz Fuertes.

The Ethiopian wolf is similar in size and build to North America's coyote; it is larger than the golden, black-backed and side-striped jackal, and has relatively longer legs. Its skull is very flat, with a long facial region accounting for 58% of the skull's total length. The ears are broad, pointed and directed forward. The teeth, particularly the premolars, are small and widely spaced. The canine teeth measure 14–22 mm in length, while the carnassials are relatively small. The Ethiopian wolf has eight mammae, of which only six are functional. The front paws have five toes, including a dewclaw, while the hind paws have four. As is typical in the genus Canis, males are larger than females, having 20% greater body mass. Adults measure 841–1,012 millimeters (33.1–39.8 in) in body length, and 530–620 millimeters (21–24 in). Adult males weigh 14.2–19.3 kg (31–43 lb), while females weigh 11.2–14.15 kg (24.7–31.2 lb).[3]

The Ethiopian wolf has short guard hairs and thick underfur, which provides protection at temperatures as low as −15°. Its overall colour is ochre to rusty red, with dense whitish to pale ginger underfur. The fur of the throat, chest and underparts is white, with a distinct white band occurring around the sides of the neck. There is a sharp boundary between the red coat and white marks. The ears are thickly furred on the edges, though naked on the inside. The naked borders of the lips, the gums and palate are black. The lips, a small spot on the cheeks and an ascending crescent below the eyes are white. The thickly furred tail is white underneath, and has a black tip, though, unlike most other canids, there is no dark patch marking the supracaudal gland. It moults during the wet season (August–October), and there is no evident seasonal variation in coat colour, though the contrast between the red coat and white markings increases with age and social rank. Females tend to have paler coats than males. During the breeding season, the female's coat turns yellow, becomes woolier, and the tail turns brownish, losing much of its hair.[3]

Animals resulting from Ethiopian wolf-dog hybridisation tend to be more heavily built than pure wolves, have shorter muzzles and different coat patterns.[22]

Behaviour[edit]

Southern Ethiopian wolf in the Bale Mountains.

Social and territorial behaviours[edit]

The Ethiopian wolf is a social animal, which lives in family groups containing up to 20 individuals older than one year, though packs of six wolves are more common. Packs are formed by dispersing males and a few females which, with the exception of the breeding female, are reproductively suppressed. Each pack has a well established hierarchy, with dominance and subordination displays being common. Upon dying, a breeding female can be replaced by a resident daughter, though this increases the risk of inbreeding. Such a risk is sometimes circumvented by multiple paternity and extra-pack matings. The dispersal of wolves from their packs is largely restricted by the scarcity of unoccupied habitat.[23]

These packs live in communal territories, which encompass 6 km2 (2.3 sq mi) of land on average. In areas with little food, the species lives in pairs, sometimes accompanied by pups, and defends larger territories averaging 13.4 km2 (5.2 sq mi). In the absence of disease, Ethiopian wolf territories are largely stable, but packs can expand whenever the opportunity arises, such as when another pack disappears. The size of each territory correlates with the abundance of rodents, the number of wolves in a pack, and the survival of pups. Ethiopian wolves rest together in the open at night, and congregate for greetings and border patrols at dawn, noon and evenings. They may shelter from rain under overhanging rocks and behind boulders. The species never sleeps in dens, and only uses them for nursing pups. When patrolling their territories, Ethiopian wolves regularly scent-mark, and interact aggressively and vocally with other packs. Such confrontations typically end with the retreat of the smaller group.[23]

Reproduction and development[edit]

The mating season usually takes place in between August–November. Courtship involves the breeding male following the female closely. The breeding female only accepts the advances of the breeding male, or males from other packs. The gestation period lasts 60–62 days, with pups being born between October–December.[24] Pups are born toothless and with their eyes closed, and are covered in a charcoal grey coat with a buff patch on the chest and abdomen. Litters consist of 2-6 pups, which emerge from their den after three weeks, at which time the dark coat is gradually replaced with the adult colouration. By the age of five weeks, the pups feed on a combination of milk and solid food, and become completely weaned off milk at the age of 10 weeks to six months.[3] All members of the pack contribute to protecting and feeding the pups, with subordinate females sometimes assisting the dominant female by suckling them. Full growth and sexual maturity are attained at the age of two years.[24]

Hunting behaviours[edit]

Southern Ethiopian wolf feeding, Bale Mountains.

Unlike most social carnivores, the Ethiopian wolf tends to forage and feed on small prey alone. It is most active during the day, the time when rodents are themselves most active, though they have been observed to hunt in groups when targeting mountain nyala calves.[25] Major Percy-Cotton described the hunting behaviour of Ethiopian wolves as thus:

... they are most amusing to watch, when hunting. The rats, which are brown, with short tails, live in big colonies and dart from burrow to burrow, while the cuberow stands motionless till one of them shows, when he makes a pounce for it. If he is unsuccessful, he seems to lose his temper, and starts digging violently ; but this is only lost labour, as the ground is honeycombed with holes, and every rat is yards away before he has thrown up a pawful.[26]

The technique described above is commonly used in hunting big-headed mole rats, with the level of effort varying from scratching lightly at the hole to totally destroying a set of burrows, leaving metre high earth mounds. Wolves in Bale have been observed to forage among cattle herds, a tactic thought to aid in ambushing rodents out of their holes by using the cattle to hide their presence.[3]

Ecology[edit]

Habitat[edit]

Northern Ethiopian wolf in the Simien Mountains.

The Ethiopian wolf is restricted to isolated pockets of Afroalpine grasslands and heathlands inhabited by Afroalpine rodents. Its ideal habitat extends from above the tree line at about 3,200m to 4,500m, with some wolves inhabiting the Bale Mountains being present in montane grasslands at 3,000m. Although specimens were collected in Gojjam and northwestern Shoa at 2,500m in the early 20th century, there are no recent records of the species occurring below 3,000m. In modern times, subsistence agriculture, which extends up to 3,700m, has largely restricted the species to the highest peaks.[27]

Big-headed mole rat (Tachyoryctes macrocephalus), one of the Ethiopian wolf's primary prey animals.

The Ethiopian wolf utilises all Afroalpine habitats, but has a preference for open areas containing short herbaceous and grassland communities inhabited by rodents, which are most abundant along flat or gently sloping areas with poor drainage and deep soils. Prime wolf habitat in the Bale Mountains consists of short Alchemilla herbs and grasses, with low vegetation cover. Other favourable habitats consist of tussock grasslands, high altitude scrubs rich in Helichrysum, and short grasslands growing in shallow soils. In its northern range, the wolf's habitat is composed of plant communities characterised by a matrix of Festuca tussocks, Euryops bushes and giant lobelias, all of which are favoured by the wolf's rodent prey. Although marginal in importance, the ericaceous moorlands at 3,200-3,600m in Simien may provide a refuge for wolves in highly disturbed areas.[27]

Diet[edit]

In the Bale Mountains, the Ethiopian wolf's primary prey are big-headed mole rats, though it will also feed on grass rats, black-clawed brush-furred rats and highland hares. Other secondary prey species include vlei rats, yellow-spotted brush-furred rats, and occasionally goslings and eggs. Ethiopian wolves have twice been observed to feed on rock hyraxes and mountain nyala calves. In areas where the big-headed mole rat is absent, the smaller East African mole rat is targeted. In the Simien Mountains, the Ethiopian wolf preys on Abyssinian grass rats. Undigested sedge leaves have occasionally been found in Ethiopian wolf stomachs. It is possible that sedge is ingested for roughage or for parasite control. The species may scavenge on carcasses, but is usually displaced by dogs and golden jackals. It typically poses no threat to livestock, with farmers often leaving herds in wolf inhabited areas unattended.[3]

Range and populations[edit]

There are currently six Ethiopian wolf populations. North of the Rift Valley, the species occurs in the Simien Mountains in Gondar, in the northern and southern Wollo highlands, and in Guassa Menz in north Shoa. It has recently become extinct in Gosh Meda in north Shoa and Mount Guna, and have not been reported in Mount Choqa for several decades. Southeast of the Rift Valley, it occurs in the Arsi and Bale Mountains.[28]

Threats[edit]

The Ethiopian wolf has been considered rare since it was first recorded scientifically. It is likely that the species has always been confined to Afroalpine habitats, and was thus never widespread. In historical times, all of the Ethiopian wolf's threats are both directly and indirectly human-induced, as the wolf's highland habitat, with its high annual rainfall and rich fertile soils, is ideal for agricultural activities. Its proximate threats include habitat loss and fragmentation (subsistence agriculture, overgrazing, road construction and livestock farming), diseases (primarily rabies and CDV), conflict with humans (poisoning, persecution and road kills), and hybridisation with dogs.[30]

Disease[edit]

Rabies outbreaks, stemming from infected dogs, have killed many Ethiopian wolves over the 1990s and 2000s. Two well documented outbreaks in Bale, one in 1991 and another in 2008-2009, resulted in the die-off or disappearance of 75% of known animals. Both incidents prompted reactive vaccinations in 2003 and 2008-2009 respectively. CDV is not necessarily fatal to wolves, though there has been a recent increase in infection, with outbreaks of canine distemper having been detected in 2005-2006 in Bale and in 2010 across subpopulations.[31]

Habitat loss[edit]

During the 1990s, wolf populations in Gosh Meda and Guguftu went extinct. In both cases, the extent of Afroalpine habitat above the limit of agriculture had been reduced to less than 20 km². The EWCP team confirmed the extinction of a wolf population in Mt. Guna in 2011, whose numbers had been in single figures for several years. Habitat loss in the Ethiopian highlands is directly linked to agricultural expansion into Afroalpine areas. In the northern highlands, human density is the among the highest in Africa, with 300 people per km² in some localities, with almost all areas below 3,700m having been converted into barley fields. Suitable areas of land below this limit are under some level of protection, such as Guassa-Menz and the Denkoro Reserve, or within the southern highlands, such as the Arsi and Bale Mountains. The most vulnerable wolf populations to habitat loss are those within relatively low-lying Afroalpine ranges, such as those in Aboi Gara and Delanta in North Wollo.[32]

Population fragmentation[edit]

Some Ethiopian wolf populations, particularly those in North Wollo, show signs of high fragmentation, which is likely to increase with current rates of human expansion. The dangers posed by fragmentation include increased contact with humans, dogs and livestock, and further risk of isolation and inbreeding in wolf populations. Although there is no evidence of inbreeding depression or reduced fitness, the extremely small wolf population sizes, particularly those north of the Rift Valley, raises concerns among conservationists. Elsewhere, the Bale populations are fairly continuous, while those in Simien can still interbreed through habitat corridors.[33]

Encroachment within protected areas[edit]

In the Simien Mountains National Park, human and livestock populations are increasing by 2% annually, with further road construction allowing easy access to peasants into wolf home ranges. 3,171 people in 582 households were found to be living in the park and 1,477 outside the park in October 2005. Although the area of the park has since been expanded, further settlement stopped and grazing restricted, effective enforcement may take years. As of 2011, there are about 30,000 people in 30 villages around the park and two within it, including 4,650 cereal farmers, herders, woodcutters and many others. In Bale there are numerous villages in and around the area, comprising over 8,500 households with more than 12,500 dogs. It was estimated in 2007 that the number of households within wolf habitat numbered 1,756. Because of the high number of dogs, the risk of infection in local wolf populations is high. Furthermore, intentional and unintentional brush fires are frequent in the ericaceous moorlands wolves inhabit.[34]

Overgrazing[edit]

Although wolves in Bale have learned to use cattle to conceal their presence when hunting for rodents, the level of grazing in the area can adversely affect the vegetation available for the wolves' prey. Although no declines in wolf populations related to overgrazing have occurred, it is known that high grazing intensities can lead to soil erosion and vegetation deterioration in Afroalpine areas such as Delanta and Simien.[35]

Human persecution and disturbance[edit]

Direct killings of wolves were more frequent during the Ethiopian Civil War, when firearms were more available. The extinction of wolves in Mt. Choqa was likely due to persecution. Although people living close to wolves in modern times believe that wolf populations are recovering, negative attitudes towards the species persist due to livestock predation. Wolves were largely unmolested by humans in Bale, as they were not considered threats to sheep and goats. However, they are perceived as threats to livestock elsewhere, with cases of retaliatory killings occurring in the Arsi Mountains. The Ethiopian wolf has not been recorded to be exploited for its fur, though there was one case where wolf hides were used as saddle pads. It was once hunted by sportsmen, though this is now illegal. Vehicle collisions killed at least four wolves in the Sanetti Plateau since 1988, while two others were left with permanent limps. Similar accidents are a risk in areas where roads cut across wolf habitats, such as in Menz and Arsi.[22]

Hybridisation with dogs[edit]

Incidences of Ethiopian wolf-dog hybridisation have been recorded in Bale's Web Valley. At least four hybrids were identified and sterilised in the area. Although hybridisation has not been detected elsewhere, it could pose a threat to the wolf population's genetic integrity, resulting in outbreeding depression or a reduction in fitness, though this does not appear to have taken place.[22]

Conservation[edit]

Ethiopian wolf, depicted on a 1987 postage stamp.

The Ethiopian wolf is not listed on the CITES Appendices, though it is afforded full official protection under Ethiopia's Wildlife Conservation Regulations of 1974, Schedule VI, with the killing of a wolf carrying a two year jail sentence.[2]

The species is present in several protected areas, including three areas in South Wollo (Bale Mountains National Park, Simien Mountains National Park and Borena Saiynt Regional Park), one in north Shoa (Guassa Community Conservation Area) and one in the Arsi Mountains Regional Park. Areas of suitable wolf habitat have recently increased to 87%, as a result of boundary extensions in Simien and the creation of the Arsi Mountains Regional Park.[2]

Steps taken to insure the survival of the Ethiopian wolf include dog vaccination campaigns in Bale, Menz and Simien, sterilization programs for wolf-dog hybrids in Bale, rabies vaccination of wolves in parts of Bale, community and school education programs in Bale and Wollo, contributing to the running of national parks, and population monitoring and surveying. A 10-year National Action Plan was formed in February 2011.[2]

The species' critical situation was first publicised by the Wildlife Conservation Society in 1983, with the Bale Mountains Research Project being established shortly after. This was followed by a detailed four-year field study, which prompted the IUCN/SSC Canid Specialist Group to produce an action plan in 1997. The plan called for the education of people in wolf-inhabited areas, wolf population monitoring and the stemming of rabies in dog populations. The Ethiopian Wolf Conservation Programme was formed in 1995 by Oxford University, with donours including the Born Free Foundation, Frankfurt Zoological Society (FZS) and the Wildlife Conservation Network.[2]

The overall aim of the EWCP is to protect the wolf's Afroalpine habitat in Bale, and establish additional conservation areas in Menz and Wollo. As well as monitoring wolves in Bale, south and north Wollo, the EWCP carries out education campaigns for people outside the wolf's range in order to improve dog husbandry and manage diseases within and around the park. The program seeks to vaccinate up to 5,000 dogs a year in order to reduce rabies and CDV in wolf inhabited areas.[2]

Notes[edit]

  1. ^ This is in reference to the Ethiopian wolf's reported habit of following mares and cows about to give birth in order to feed on the afterbirth.[9]
  2. ^ This was later proven incorrect in 2010, when SNP studies showed that the dog's sole ancestor is the grey wolf.[15]

References[edit]

  1. ^ a b Wozencraft, W. C. (2005). "Order Carnivora". In Wilson, D. E.; Reeder, D. M. Mammal Species of the World (3rd ed.). Johns Hopkins University Press. pp. 532–628. ISBN 978-0-8018-8221-0. OCLC 62265494. 
  2. ^ a b c d e f g h Marino, J. & Sillero-Zubiri, C. (2011). Canis simensis. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 18 January 2012. Database entry includes a lengthy justification of why this species is endangered
  3. ^ a b c d e f g Sillero-Zubiri, C., and D. Gottelli (1994). Canis simensis. Mammalian Species 385: 1-6.
  4. ^ a b Gottelli D, Marino J, Sillero-Zubiri C, Funk S (2004). The effect of the last glacial age on speciation and population genetic structure of the endangered Ethiopian wolf (Canis simensis). Molecular Ecology 13:2275-2286.
  5. ^ a b c d IUCN/SSC Canid Specialist Group 2011, pp. 7–8
  6. ^ a b Sillero-Zubiri & MacDonald 1997, p. 5 & 8
  7. ^ Johnston, Harry Hamilton (1902). The Uganda protectorate; an attempt to give some description of the physical geography, botany, zoology, anthropology, languages and history of the territories under British protection in East Central Africa, between the Congo Free State and the Rift Valley and between the first degree of south latitude and the fifth degree of north latitude. London, Hutchinson & Co. p. 368.
  8. ^ a b c Lydekker 1908, p. 462
  9. ^ a b IUCN/SSC Canid Specialist Group 2011, p. 2
  10. ^ "The Aberdeen Bestiary". University of Aberdeen. 1995. Retrieved 2012-12-05. 
  11. ^ Rüppell 1835, p. 39
  12. ^ a b Powell-Cotton 1902, pp. 206–207
  13. ^ Parkyns, Mansfield (1853). Life in Abyssinia: Being Notes Collected During Three Years' Residence and Travels in that Country. Vol. II. John Murray. pp. 12-13.
  14. ^ Darwin, Charles (1868). The Variation of Animals and Plants Under Domestication. Vol. I. Orange Judd. p. 48.
  15. ^ Vonholdt, B. M.; Pollinger, J. P.; Lohmueller, K. E.; Han, E.; Parker, H. G.; Quignon, P.; Degenhardt, J. D.; Boyko, A. R.; Earl, D. A.; Auton, A.; Reynolds, A.; Bryc, K.; Brisbin, A.; Knowles, J. C.; Mosher, D. S.; Spady, T. C.; Elkahloun, A.; Geffen, E.; Pilot, M.; Jedrzejewski, W.; Greco, C.; Randi, E.; Bannasch, D.; Wilton, A.; Shearman, J.; Musiani, M.; Cargill, M.; Jones, P. G.; Qian, Z.; Huang, W. (2010). "Genome-wide SNP and haplotype analyses reveal a rich history underlying dog domestication". Nature 464 (7290): 898–902. doi:10.1038/nature08837. PMC 3494089. PMID 20237475.  edit
  16. ^ Dalton, R. 2001. The skull morphology of the Ethiopian wolf (Canis simensis). B.Sc.thesis. University of Edinburgh, Edinburgh, UK.
  17. ^ a b IUCN/SSC Canid Specialist Group 2011, pp. 2–3
  18. ^ Powell-Cotton 1902, p. 459
  19. ^ Clutton-Brock, J., Corbet, G.G., and Hills, M. (1976). "A review of the family Canidae, with a classification by numerical methods." Bull. Brit. Mus. Nat. Hist. 29, 119–199.
  20. ^ Gotelli, D.; C. Sillero-Zubiri, G.D. Applebaum, M.S. Roy, D.J. Girman, J. Garcia-Moreno, E.A. Ostrander, R.K. Wayne (1994). "Molecular genetics of the most endangered canid: the Ethiopian wolf Canis simensis". Molecular Ecology (Institute of Zoology, Zoological Society of London, UK) 3 (4): 301–312. doi:10.1111/j.1365-294X.1994.tb00070.x. PMID 7921357. 
  21. ^ Lindblad-Toh, K.; Wade, CM; Mikkelsen, TS; Karlsson, EK; Jaffe, DB; Kamal, M; Clamp, M; Chang, JL et al. (2005). "Genome sequence, comparative analysis and haplotype structure of the domestic dog". Nature 438 (7069): 803–819. doi:10.1038/nature04338. PMID 16341006. 
  22. ^ a b c IUCN/SSC Canid Specialist Group 2011, p. 32
  23. ^ a b IUCN/SSC Canid Specialist Group 2011, p. 4
  24. ^ a b IUCN/SSC Canid Specialist Group 2011, pp. 4–5
  25. ^ IUCN/SSC Canid Specialist Group 2011, pp. 3–4
  26. ^ Powell-Cotton 1902, p. 207
  27. ^ a b IUCN/SSC Canid Specialist Group 2011, pp. 19–20
  28. ^ IUCN/SSC Canid Specialist Group 2011, p. 10
  29. ^ IUCN/SSC Canid Specialist Group 2011, pp. 40–46
  30. ^ IUCN/SSC Canid Specialist Group 2011, p. 22
  31. ^ IUCN/SSC Canid Specialist Group 2011, pp. 22–26
  32. ^ IUCN/SSC Canid Specialist Group 2011, pp. 26–27
  33. ^ IUCN/SSC Canid Specialist Group 2011, pp. 27–28
  34. ^ IUCN/SSC Canid Specialist Group 2011, p. 29
  35. ^ IUCN/SSC Canid Specialist Group 2011, p. 30

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