Undomesticated four-footed mammal from the equine family
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).
The wild horse (Equus ferus) is a
species of the
genusEquus, which includes as
subspecies the modern
domesticatedhorse (Equus ferus caballus) as well as the
endangeredPrzewalski'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.[7] Przewalski's horse had reached the brink of
extinction, but was reintroduced successfully into the wild.[8] The tarpan became extinct in the 19th century, but is theorized to have been present on the
steppes of
Eurasia at the time of domestication.[9][10][11][12] Since the extinction of the tarpan, attempts have been made to reconstruct its
phenotype using domestic horses, resulting in
horse breeds such as the
Heck horse.[13][14] However, the genetic makeup and
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
North America about 1.1 - 1.2
million years ago. Around 800,000 - 900,000 years ago, E. ferus migrated west to
Eurasia via the
Bering Land Bridge, and south to
South America via the
Isthmus of Panama as part of the
Great American Interchange. By the mid-late
Pleistocene, it had an extremely large range across the Americas, Eurasia, and North Africa, across which it was abundant. There have been several fossil horse taxa from throughout this range, such as Equus lambei and Amerhippus, that were formerly considered distinct species, but genetic and morphological analysis supports them as being
conspecific with E. ferus.[17][18][19][20]
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
Late Pleistocene epoch, there were several other subspecies of E. ferus which have all since gone
extinct. The exact categorization of Equus remains into species or subspecies is a complex matter and the subject of ongoing work.[26]
The horse family
Equidae and the genus Equus evolved in North America during the
Pliocene, before the species migrated across
Beringia into the
Eastern Hemisphere.[28] Studies using
ancient DNA, as well as DNA of recent individuals, suggest the presence of two equine species in Late Pleistocene North America, a caballine species, suggested to be conspecific with the wild horse,[29][30] and Haringtonhippus francisci, the "New World stilt-legged horse"; the latter has been
taxonomically assigned to various names, and appears to be outside the grouping containing all extant equines.[31] In South America there appear to have been several species of equine, Equus (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 occupied the eastern
Eurasian Steppes, perhaps from the
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 raised for meat and milk[54] by the
Botai culture 5500 years ago were Przewalski's horses. The paper claims specifically that modern Przewalski's horses are the feral descendents of the domesticated[55][56] Botai horse, although it is also possible both groups could have descended separately from the same ancient wild Przewalski's horses.[57][58]
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.[59] A small breeding population has been reintroduced in Mongolia.[60][61] 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.[62]
Przewalski's horse has some biological differences from the domestic
horse; unlike
domesticated horses and the tarpan, which both have 64
chromosomes, Przewalski's horse has 66 chromosomes due to a
Robertsonian translocation.[63] However, the offspring of Przewalski and domestic horses are fertile, possessing 65 chromosomes.[64]
Horses that live in an untamed state but have ancestors that have been
domesticated are called "feral horses".[65] For instance, when the Spanish reintroduced the horse to the Americas, beginning in the late 15th century,[66] some horses escaped, forming
feral herds; the best-known being the
mustang.[67] Similarly, the
brumby descended from horses strayed or let loose in Australia by English settlers.[68] Isolated populations of
feral horses occur in a number of places, including
Bosnia,
Croatia,
New Zealand,
Portugal,
Scotland and a number of
barrier islands along the Atlantic coast of North America from
Sable Island off
Nova Scotia, to
Cumberland Island, off the coast of
Georgia.[69] Even though these are often referred to as "wild" horses, they are not truly "wild" if wildness is defined as having no domesticated ancestors.[65]
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.[70] It was speculated that the
Riwoche horse might be a
relict population of wild horses,[71] but testing did not reveal genetic differences with domesticated horses,[72] which is in line with news reports indicating that they are used as pack and riding animals by the local villagers.[73] 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.[72]
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abCai, Dawei; Zhuowei Tang; Lu Han; Camilla F. Speller; Dongya Y. Yang; Xiaolin Ma; Jian'en Cao; Hong Zhu; Hui Zhou (2009). "Ancient DNA provides new insights into the origin of the Chinese domestic horse". Journal of Archaeological Science. 36 (3): 835–842.
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