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Chestnut (horse Anatomy)
The chestnut, also known as a night eye, is a callosity on the body of a horse or other equine, found on the inner side of the leg above the knee on the foreleg and, if present, below the hock (zoology), hock on the hind leg. It is believed to be a vestigial toe, and along with the Ergot (horse anatomy), ergot form the three toes of some other extinct Equidae. Darren Naish dissents from this belief, noting that the chestnut is "not associated with the metacarpus or metatarsus, the only places where digits occur." Chestnuts vary in size and shape and are sometimes compared to the fingerprints in humans. For purposes of identification some breed registry, breed registries require photographs of them among other individual characteristics. However, because chestnuts grow over time and horse groomers often peel or trim off the outer layers for neatness, their appearance is subject to change. Distribution among equines The evolution of the horse involved a reduction in the numb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chestnut On The Leg Of A Horse
The chestnuts are the deciduous trees and shrubs in the genus ''Castanea'', in the beech family Fagaceae. The name also refers to the edible nuts they produce. They are native to temperate regions of the Northern Hemisphere. Description Chestnut trees are of moderate growth rate (for the Chinese chestnut tree) to fast-growing for American and European species. Their mature heights vary from the smallest species of chinkapins, often shrubby,''Chestnuts, Horse-Chestnuts, and Ohio Buckeyes'' . In Yard and Garden Brief, Horticulture department at University of Minnesota. to the giant of past American forests, '' C. dentata'' that could reach . Between these extremes are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Equid
Equidae (commonly known as the horse family) is the Taxonomy (biology), taxonomic Family (biology), family of Wild horse, horses and related animals, including Asinus, asses, zebra, zebras, and many extinct species known only from fossils. The family evolved more than 50 million years ago, in the Eocene epoch, from a small, multi-toed ungulate into larger, single-toed animals. All Extant taxon, extant species are in the genus ''Equus (genus), Equus'', which originated in North America. Equidae belongs to the order Perissodactyla, which includes the extant tapirs and rhinoceros, and several extinct families. It is more specifically grouped within the superfamily (taxonomy), superfamily Equoidea, the only other family being the extinct Palaeotheriidae. The term equid refers to any member of this family, including any equinae, equine. Evolution The oldest known fossils assigned to Equidae were found in North America, and date from the early Eocene epoch, 54 million years ago. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Icelandic Horse
The Icelandic horse ( ), or Icelandic, is a Horse breed, breed of horse developed in Iceland. Although the horses are smaller (at times pony-sized) than other breeds, most Breed registry, registries for the Icelandic refer to it as a horse. The breed is Horse#Lifespan and life stages, long-lived and hardy, owing to the ruggedness of its home country. In their native Iceland they have few afflictions or diseases, thus national biosecurity, laws are in place preventing foreign-born horses from being imported into the country, while exported animals are not permitted to return. In addition to the Horse gaits, gaits of walk, trot, and Canter and gallop, canter/gallop, typical of other horse breeds, many Icelandic horses can also do the Ambling gait, tölt (ambling gait) and the Horse gait#Pace, flying pace. The only breed of horse in Iceland, the Icelandic is also popular internationally, and sizable populations exist in Europe and North America. The breed is still used for traditio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caspian Pony
The Caspian is an Iranian breed of pony or small horse of Oriental type. The breed was rediscovered in 1965 by an Iranian aristocrat in Tehran, Narcy Firouz, and his American-born wife, Louise Laylin from a base stock of a small number of small horses found in the Elburz Mountains in Amol. In 2011, the remains of a small horse dating back to 3400 B.C.E. were found at Gohar Tappeh, Iran, giving rise to claims that today's Caspian originates from the oldest known breed of the domestic horse. It is also one of the rarest horse breeds and its population status is critically endangered. History The Caspian is said to originate from the mountainous regions of northern Iran, which explains how the breed is tough, athletic, and nimble. Indeed, the oldest known specimen of a Caspian-like horse was found in 2011, in a cemetery dating back to 3400 B.C.E., in the archaeological dig at Gohar Tappeh in the province of Mazandaran in northern Iran, between the cities of Neka and Behshahr. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Banker Horse
The Banker horse is a horse breed, breed of feral horse (''Equus ferus caballus'') living on barrier islands in North Carolina's Outer Banks. It is small, hardy, and has a docile temperament. Descended from domesticated Iberian horse, Spanish horses and possibly brought to the Americas in the 16th century, the ancestral foundation bloodstock may have become feral after surviving shipwrecks or being abandoned on the islands by one of the exploratory expeditions led by Lucas Vázquez de Ayllón or Sir Richard Grenville. Populations are found on Ocracoke, North Carolina, Ocracoke Island, Shackleford Banks, Bodie Island, Currituck Banks, Cedar Island, North Carolina, Cedar Island, and in the Rachel Carson Estuarine Sanctuary. Bankers are allowed to remain on the islands due to their historical significance even though they can trample plants and ground-nesting animals and are not considered to be Indigenous (ecology), indigenous. They survive by grazing on marsh grasses, which suppl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Horse Breed
A horse breed is a selectively bred population of domesticated horses, often with pedigrees recorded in a breed registry. However, the term is sometimes used in a broader sense to define landrace animals of a common phenotype located within a limited geographic region, or even feral "breeds" that are naturally selected. Depending on definition, hundreds of "breeds" exist today, developed for many different uses. Horse breeds are loosely divided into three categories based on general temperament: spirited "hot bloods" with speed and endurance; "cold bloods," such as draft horses and some ponies, suitable for slow, heavy work; and "warmbloods," developed from crosses between hot bloods and cold bloods, often focusing on creating breeds for specific riding purposes, particularly in Europe. Horse breeds are groups of horses with distinctive characteristics that are transmitted consistently to their offspring, such as conformation, color, performance ability, or disposition. Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Przewalski's Horse
Przewalski's horse (''Equus ferus przewalskii'' or ''Equus przewalskii''), also called the takhi, Mongolian wild horse or Dzungarian horse, is a rare and endangered wild horse originally native to the steppes of Central Asia. It is named after the Russian geographer and explorer Nikolay Przhevalsky. Once extinct in the wild, since the 1990s it has been Reintroduction, reintroduced to its native habitat in Mongolia in the Khustain Nuruu National Park, Takhin Tal Nature Reserve, and Khomiin Tal, as well as several other locales in Central Asia and Eastern Europe. Several genetic characteristics of Przewalski's horse differ from what is seen in modern domestic horses, indicating neither is an ancestor of the other. For example, Przewalski's horse has 33 chromosome pairs, compared to 32 for the domestic horse. Their ancestral lineages split from a common ancestor between 160,000 and 38,000 years ago, long before the domestication of the horse. Przewalski's horse was long considered ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Domestic Horse
The horse (''Equus ferus caballus'') is a domesticated, one-toed, hoofed mammal. It belongs to the taxonomic family Equidae and is one of two extant subspecies of ''Equus ferus''. The horse has evolved over the past 45 to 55 million years from a small multi-toed creature, ''Eohippus'', into the large, single-toed animal of today. Humans began domesticating horses around 4000 BCE in Central Asia, and their domestication is believed to have been widespread by 3000 BCE. Horses in the subspecies ''caballus'' are domesticated, although some domesticated populations live in the wild as feral horses. These feral populations are not true wild horses, which are horses that have never been domesticated. There is an extensive, specialized vocabulary used to describe equine-related concepts, covering everything from anatomy to life stages, size, colors, markings, breeds, locomotion, and behavior. Horses are adapted to run, allowing them to quickly escape predators, and posse ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zebra
Zebras (, ) (subgenus ''Hippotigris'') are African equines with distinctive black-and-white striped coats. There are three living species: Grévy's zebra (''Equus grevyi''), the plains zebra (''E. quagga''), and the mountain zebra (''E. zebra''). Zebras share the genus '' Equus'' with horses and asses, the three groups being the only living members of the family Equidae. Zebra stripes come in different patterns, unique to each individual. Several theories have been proposed for the function of these patterns, with most evidence supporting them as a deterrent for biting flies. Zebras inhabit eastern and southern Africa and can be found in a variety of habitats such as savannahs, grasslands, woodlands, shrublands, and mountainous areas. Zebras are primarily grazers and can subsist on lower-quality vegetation. They are preyed on mainly by lions, and typically flee when threatened but also bite and kick. Zebra species differ in social behaviour, with plains and mountain z ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asinus
''Asinus'' is a subgenus of ''Equus (genus), Equus'' that encompasses several subspecies of the Equidae commonly known as wild asses, characterized by long ears, a lean, straight-backed build, lack of a true withers, a coarse mane and tail, and a reputation for considerable toughness and endurance. The common donkey is the best-known domesticated representative of the subgenus, with both domestication, domesticated and feral varieties. Among the wild ass species, several never-domesticated species live in Asia and Africa, with the extinct European wild ass species formerly inhabiting Europe. Taxonomy * Genus: ''Equus'' ** Subgenus: ''Asinus'' *** African wild ass, ''Equus africanus'' **** Nubian wild ass, ''Equus africanus africanus'' **** Somali wild ass, ''Equus africanus somaliensis'' **** Atlas wild ass, †''Equus africanus atlanticus'' (Extinction, extinct 1st millienium AD) **** Donkey, ''Equus africanus asinus'' ***Onager or Asiatic wild ass, ''Equus hemionus'' **** Mong ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extant Taxon
Neontology is a part of biology that, in contrast to paleontology, studies and deals with living (or, more generally, '' recent'') organisms. It is the study of extant taxa (singular: extant taxon): taxa (such as species, genera and families) with members still alive, as opposed to (all) being extinct. For example: * The Indian elephant (''Elephas maximus'') is an extant species, and the woolly mammoth (''Mammuthus primigenius'') is an extinct species. * The moose (''Alces alces'') is an extant species, and the Irish elk (''Megaloceros giganteus'') is an extinct species. * In the group of molluscs known as the cephalopods, there were approximately 600 extant species and 7,500 extinct species. A taxon can be classified as extinct if it is broadly agreed or certified that no members of the group are still alive. Conversely, an extinct taxon can be reclassified as extant if there are new discoveries of living species (" Lazarus species"), or if previously known extant species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vestigiality
Vestigiality is the retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. Assessment of the vestigiality must generally rely on comparison with homology (biology), homologous features in related species. The emergence of vestigiality occurs by normal evolutionary processes, typically by loss of function of a feature that is no longer subject to Directional selection, positive Evolutionary pressure, selection pressures when it loses its value in a changing environment. The feature may be Negative selection (natural selection), selected against more urgently when its function becomes definitively harmful, but if the lack of the feature provides no advantage, and its presence provides no disadvantage, the feature may not be phased out by natural selection and persist across species. Examples of vestigial structures (also called degenerate, atrophied, or rudimentary orga ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
