Wild horse

Source: Wikipedia, the free encyclopedia.

This article is about the species Equus ferus. For free-roaming horses descended from domesticated ancestry, see Feral horse. For other uses, see Wild horse (disambiguation).

Wild horse
Top left:
Equus ferus przewalskii
 (Przewalski's horse)

Below left:

Equus ferus ferus
† (tarpan)
Below right: Equus ferus fossil from 9100 BC

Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Perissodactyla
Family: Equidae
Genus: Equus
Subgenus:
Equus
Species:
E. ferus
Binomial name
Equus ferus
Boddaert, 1785
Subspecies
  • Equus ferus ferus
  • Equus ferus przewalskii
  • Equus ferus caballus

The wild horse (Equus ferus) is a

domesticated horse (Equus ferus caballus) as well as the endangered Przewalski's horse (Equus ferus przewalskii, sometimes treated as a separate species i.e. Equus przewalskii).[2][3] The European wild horse, also known as the tarpan, that went extinct in the late 19th or early 20th century has previously been treated as the nominate subspecies of wild horse, Equus ferus ferus, but more recent studies have cast doubt on whether tarpans were truly wild or if they actually were feral horses or hybrids.[4][5][6]

Other subspecies of Equus ferus may have existed and could have been the stock from which domesticated horses are descended.

foundation bloodstock
of those breeds is substantially derived from domesticated horses, so these breeds possess domesticated traits.

The term "wild horse" is also used colloquially in reference to free-roaming herds of feral horses; for example, the mustang in the United States,[15] and the brumby in Australia.[16] These feral horses are untamed members of the domestic horse (Equus caballus), not to be confused with the truly "wild" horse subspecies extant into modern times.

Distribution

Evidence supports E. ferus as having evolved in

conspecific with E. ferus.[17][18][19][20]

By the latest Pleistocene or early

Quaternary extinction event, leaving only the Old World populations. It remained widespread there and was ultimately also domesticated around 3600 B.C., but wild populations continued to decline. The last completely wild populations of the tarpan went extinct in Eastern Europe and the southern parts of Russia around the late 19th century, and Przewalski's horse of Central Asia became extinct in the wild in 1969. However, over the past few centuries feral horses have been introduced to all continents except Antarctica, and Przewalski's horses have been reintroduced to their former habitats in Mongolia.[17]

Ecology

In general, wild horses are

wolves,[22] cougars,[23] and spotted hyenas.[24]

Subspecies and their history

E. ferus has had several subspecies, those of which survived into modern times are:[25]

  • The domesticated horse (Equus ferus caballus).
  • The Eurasian wild horse (Equus ferus ferus), incorrectly listed as Equus caballus ferus in MSW 3; originally considered synonymous with the tarpan, though recent research has cast doubt on this. Horses identified as tarpans were found in Europe and
    western Asia before the last surviving animals —possibly hybrids by that time — became effectively extinct in the late 19th century. The last specimen died in 1909 whilst in captivity in an estate in Poltava Governorate, Russian Empire
    .
  • Przewalski's horse (Equus ferus przewalskii), incorrectly listed as Equus caballus przewalskii in MSW 3; also known as the Mongolian wild horse or takhi, it is native to Central Asia and the Gobi Desert. It is sometimes considered its own species, Equus przewalskii.

The latter two are the only never-domesticated "wild" groups that survived into historic times. However, other subspecies of Equus ferus may have existed.[7]

In the

extinct. The exact categorization of Equus remains into species or subspecies is a complex matter and the subject of ongoing work.[26]

Evolutionary history and taxonomy

Equus ferus fossil from 9100 BC found near Odense, at the Zoological Museum in Copenhagen
Probable European wild horse coat colors[27]
Main article: Evolution of the horse

The horse family

Amerhippus) neogeus, which had previously thought to represent 5 taxa due to morphological variability,[32] and several species of Hippidion, which also lie outside the group containing all living horses.[33] (It had previously been suggested to have been nested within Equus based on incomplete sequence data[34]
)

Currently, three subspecies that lived during recorded human history are recognized.[25] One subspecies is the widespread domestic horse (Equus ferus caballus),[25] as well as two wild subspecies: the recently extinct European wild horse (E. f. ferus) and the endangered Przewalski's horse (E. f. przewalskii).[10][11][25]

Genetically, the pre-domestication horse, E. ferus, and the domesticated horse, E. caballus, form a single homogeneous group (clade) and are genetically indistinguishable from each other.[29][34][35][36] The genetic variation within this clade shows only a limited regional variation, with the notable exception of Przewalski's horse.[29][34][35][36] Przewalski's horse has several unique genetic differences that distinguish it from the other subspecies, including 66 instead of 64 chromosomes,[10][37] unique Y-chromosome gene haplotypes,[38] and unique mtDNA haplotypes.[39][40]

Besides genetic differences, osteological evidence from across the Eurasian wild horse range, based on cranial and metacarpal differences, indicates the presence of only two subspecies in postglacial times, the tarpan and Przewalski's horse.[7][41]

Scientific naming of the species

In some sources including MSW 3 (2005), the domesticated and wild horses were considered a single species, with the valid scientific name for such a single horse species being Equus ferus,[42] although MSW erroneously used E. caballus for this (enlarged) taxon on account of a mis-interpretation of the then-recent ICZN ruling on the matter,[43] refer Groves & Grubb, 2011.[44] The wild tarpan subspecies is E. f. ferus, Przewalski's horse is E. f. przewalskii, while the domesticated horse is nowadays normally (but not exclusively) treated as a separate species E. caballus. The rules for the scientific naming of animal species are determined in the International Code of Zoological Nomenclature, which stipulates that the oldest available valid scientific name is used to name the species.[45] Previously, when taxonomists considered domesticated and wild horse two subspecies of the same species, the valid scientific name was Equus caballus Linnaeus 1758,[46] with the subspecies labeled E. c. caballus (domesticated horse), E. c. ferus Boddaert, 1785 (tarpan) and E. c. przewalskii Poliakov, 1881 (Przewalski's horse).[47] However, in 2003, the International Commission on Zoological Nomenclature decided that the scientific names of the wild species have priority over the scientific names of domesticated species, therefore mandating the use of Equus ferus for both the wild and the domesticated horse if the two taxa are considered conspecific.[48]

Przewalski's horse

Przewalski's horse in Hungary

Urals to Mongolia, although the ancient border between tarpan and Przewalski's distributions has not been clearly defined.[49] Przewalski's horse was limited to Dzungaria and western Mongolia in the same period, and became extinct in the wild during the 1960s, but was reintroduced in the late 1980s to two preserves in Mongolia.[50] Although earlier researchers such as Marija Gimbutas theorized that the horses of the Chalcolithic period were Przewalski's, a 2003 study indicated that the Przewalski's horse is not an ancestor to modern domesticated horses.[51][52]
A 2015 study determined that the Przewalski and domesticated horse lineages diverged from a common ancestor about 45,000 years ago.[53]

In 2018, a DNA study revealed that the horses found associated with the Botai culture were Przewalski's horses, raising the question of whether these animals were an isolated population, if extant Przewalski horses today represent feral descendants, or if the domestication attempt at Botai failed. [54] A 2021 study noted that arrowheads were found in conjunction with some Botai horse remains, suggesting these horses were hunted, rather than domesticated, and thus the question remains unresolved.[55]

Przewalski's horse is still found today, though it is an endangered species and for a time was considered extinct in the wild.[40] Roughly 2000 Przewalski's horses are in zoos around the world.[56] A small breeding population has been reintroduced in Mongolia.[57][58] As of 2005, a cooperative venture between the Zoological Society of London and Mongolian scientists has resulted in a population of 248 animals in the wild.[59]

Przewalski's horse has some biological differences from the domestic

domesticated horses and the tarpan, which both have 64 chromosomes, Przewalski's horse has 66 chromosomes due to a Robertsonian translocation.[60] However, the offspring of Przewalski and domestic horses are fertile, possessing 65 chromosomes.[61]

Feral horses

Main articles: Feral horse, semi-feral, and feral
See also: List of megafauna discovered in modern times § Status unclear
Semi-feral Exmoor ponies. Though popularly called "wild" horses, feral and semi-feral horses had ancestors that were domesticated.

Horses that live in an untamed state but have ancestors that have been

Cumberland Island, off the coast of Georgia.[66] Even though these are often referred to as "wild" horses, they are not truly "wild" if wildness is defined as having no domesticated ancestors.[62]

In 1995, British and French explorers encountered a new population of horses in the

Riwoche Valley of Tibet, unknown to the rest of the world, but apparently used by the local Khamba people.[67] It was speculated that the Riwoche horse might be a relict population of wild horses,[68] but testing did not reveal genetic differences with domesticated horses,[69] which is in line with news reports indicating that they are used as pack and riding animals by the local villagers.[70] These horses only stand 12 hands (48 inches, 122 cm) tall and are said to resemble the images known as "horse no 2" depicted in cave paintings alongside images of Przewalski's horse.[69]

See also

References

Citations

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Bibliography

  • Equid Specialist Group 1996. Equus ferus. In: IUCN 2006. 2006 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 22 May 2006 from [1][permanent dead link].
  • Moelman, P.D. 2002. Equids. Zebras, Asses and Horses. Status Survey and Conservation Action Plan. IUCN/SSC Equid Specialist Group. IUCN, Gland, Switzerland.
  • Ronald M. Nowak (1999), Walker's Mammals of the World (6th ed.), Baltimore: Johns Hopkins University Press,
    LCCN 98023686
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