Vulpes

Last updated

Vulpes
Temporal range: 7–0  Ma
Genus vulpes.jpg
Various true foxes: left to right, then top to bottom: red fox, Rüppell's fox, corsac fox, Bengal fox, Arctic fox, Blanford's fox, Cape fox, and fennec fox
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Canidae
Subfamily: Caninae
Tribe: Vulpini
Genus: Vulpes
Garsault, 1764 [1]
Type species
Canis vulpes [2]
Species
Synonyms
  • Canis (in part)
  • Alopex Kaup, 1829
  • Fennecus
  • Neocyon

Vulpes is a genus of the sub-family Caninae. The members of this genus are colloquially referred to as true foxes, meaning they form a proper clade. The word "fox" occurs in the common names of all species of the genus, but also appears in the common names of other canid species. True foxes are distinguished from members of the genus Canis , such as domesticated dogs, wolves, jackals and coyotes, by their smaller size (5–11 kg), longer, bushier tail, and flatter skull. [3] They have black, triangular markings between their eyes and nose, and the tip of their tail is often a different color from the rest of their pelt. The typical lifespan for this genus is between two and four years, but can reach up to a decade. [3]

Contents

Extant species

Within Vulpes, 12 separate extant species and four fossil species are described:

ImageScientific nameCommon NameDistributionDistribution map
Indian Fox in a Grassland.jpg V. bengalensis Bengal fox Bengal foxes are endemic to the Indian subcontinent. [4] Vulpes-bengalensis-map.png
Blandford's fox 1.jpg V. cana Blanford's fox Blanford's fox is native to the Middle East, including Iran, Israel, Afghanistan, Egypt, and Pakistan. This species prefers semiarid environments. [5] Vulpes cana (distribution).svg
Vulpes chama (Etosha).jpg V. chama Cape fox The Cape fox is only found in Southern Africa, including Zimbabwe, Botswana, and South Africa. They thrive in semiarid and arid environments with rich grasslands. Cape Fox area.png
Vulpes corsac Halle Zoo 10.2012.jpg V. corsac Corsac fox Corsac foxes live in Central Asia. Like V. chama and V. cana, their natural habitat is semiarid deserts. Corsac area.png
Tibet Fox.jpg V. ferrilata Tibetan sand fox The Tibetan sand fox, as the name suggests, is endemic to the Tibetan and Ladakh plateau in Nepal, China, India, and Bhutan. This species lives at altitudes up to 5300 m. [6] Tibetan Fox area.png
Arctic Fox Posed (8564878025).jpg V. lagopus Arctic fox Arctic foxes inhabit all of the Arctic Circle (Russia, Svalbard, Iceland, Fennoscandia, Greenland, Northern Canada, and Alaska). Cypron-Range Vulpes lagopus.svg
Kit fox tds.jpg V. macrotis Kit fox Kit foxes are an arid area-dwelling North American species. They are found in Oregon, Colorado, Nevada, Utah, California, Arizona, New Mexico, and Texas in the United States, as well as in Mexico. Kit Fox area.png
Keulemans pale fox.png V. pallida Pale fox The pale fox lives in the Sahel region in Africa, and is an arid area-dwelling species. [7] Pale Fox area.png
Ruppell's fox.jpg V. rueppellii Rüppell's fox Ruppell's foxes are found in North Africa and parts of the Middle East. [8] Ruppel's Fox area.png
Swift Fox Colorado Wolf and Wildlife cropped.jpg V. velox Swift fox The swift fox is found in the western grasslands of North America, specifically Montana, Wyoming, New Mexico, Colorado, Kansas, Oklahoma, and Texas, as well as the Canadian Prairies. Swift Fox area.png
Fox - British Wildlife Centre (17429406401).jpg V. vulpes Red fox The red fox is the most abundant and most widely distributed species of Vulpes, occurring throughout the Northern Hemisphere (North America, Asia, and Europe). They also are present in Australia, though they were brought there by humans for fox hunting in the 1830s, and are considered an invasive species. Wiki-Vulpes vulpes.png
Fennec Fox Vulpes zerda.jpg V. zerda Fennec fox The fennec fox lives in North Africa and the Sinai Peninsula. Fennec area.png

Early history

Artistic reconstruction of Vulpes stenognathus Rattlesnake Formation Mural - Vulpes stenognathus.jpg
Artistic reconstruction of Vulpes stenognathus

The oldest known fossil species within Vulpes is V. riffautae , dating back to the late Miocene of Chad, which is within the Neogene. The deposits where these fossils are found are about 7 million years old, which might make them the earliest Canidae in the Old World. They are estimated to have weighed between 1.5 and 3.5 lb. V. skinneri, from the Malapa Fossil Site from South Africa, is younger than V. riffautae by roughly 5 million years, and shows up in the early Pleistocene. [9]

Two other extinct, less documented fossils are known: V. praeglacialis and V. hassani. V. praeglacialis was discovered in the Petralona Cave in Chalkidiki, Greece. The age of the deposits (Early Pleistocene) makes it the earliest occurrence of Vulpes in Europe. V. hassani is found in a Miocene-Pliocene deposit in northwestern Africa. [9] This species may have given rise to current Rüppell's fox, [10] which lends support that the close phylogenetic clustering of Rüppels and Red foxes is the result of recent introgressive hybridization rather than recent speciation. [11]

In the Pleistocene, Vulpes had a fairly wide distribution, with eight species found in North America. Of these eight, six are not fossil, and three species still remain in North America (V. velox, V. macrotis, and V. vulpes). The remaining three moved on to sections of Africa over time. V. stenognathus [12] is extinct, but has extant sister taxa including V. chama, V. rueppellii, V. velox, and V. vulpes, which fits with these species all evolving together in North America.[ citation needed ]

Fossil species

Description

Arctic fox (Vulpes lagopus) in winter pelage. Iceland-1979445.jpg
Arctic fox (Vulpes lagopus) in winter pelage.

True foxes are small to medium-sized animals, usually smaller than other canines, such as wolves, dogs, and jackals. For example, the largest species, the red fox, weighs on average 4.1–8.7 kg [14] and the smallest species, the fennec fox, weighs only 0.7–1.6 kg. [15] They have long, dense fur, and a bushy, rounded tail that is at least half as long, or fully as long as, the head and body. They have a rather long body with shorter limbs, a long, narrow muzzle, and large, pointed ears. The forelimbs have five toes, while the hind legs have only four. [16] The skull is light and slender, elongated. Sagittal crest not developed at all or weakly defined. [17]

Vulpes species have vertically slit pupils, which generally appear elliptical in strong light like those of cats, which provide them with significant advantages. [18] Like most canids, true foxes have a muscular body, powerful jaws, and teeth for grasping prey. Blunt claws are especially useful for gripping the ground while tracking down their prey. [19] Some species have a pungent "foxy" odor, arising mainly from a gland located on the dorsal surface of the tail, not far from its base. [16] Not much sexual dimorphism is displayed, although males are slightly larger. [17]

In general, Vulpes has a bone structure very close to that of its canid relatives, but there are some variations. For example, although canid limbs are designed specifically for running quickly on land to catch prey, Vulpes species avoid rapid sprints, excluding when being chased, and have become more specialized for leaping and grasping prey. In Vulpes vulpes, for example, the adaptions for leaping, grasping, and climbing include the lengthening of hind limbs in relation to fore limbs, as well as overall slenderizing of both hind and fore limbs. Muscles are also emphasized along the axis of limbs. [20]

The length, color and density of the fur of fox species differ. Fennec foxes (and other desert-adapted fox species such as Vulpes macrotis) have large ears and a short coat to keep the body cool. [21] On the other hand, the Arctic fox has small ears and a thick, insulating coat to keep the body warm. [22] A solid color coat is seen in most animals, but there are occasions where the coat color varies over the year to enhance camouflage against the current seasons landscape. [19] The red fox, Ruppell's fox, and Tibetan sand fox possess white-tipped tails. [23] The Arctic fox's tail-tip is of the same color as the rest of the tail (white or blue-gray). [24] Blanford's fox usually possesses a black-tipped tail, but a small number of specimens (2% in Israel, 24% in the United Arab Emirates) possess a light-tipped tail. [23] The other foxes in this group (Bengal, Cape, corsac, fennec, kit, pale, and swift) all possess black-tipped or dark-tipped tails. [23]

Distribution and habitat

The range of the genus is very wide, present in a wide variety of habitats, from the desert to the Arctic, and from high altitudes in the mountains to open plains. True foxes are opportunistic and thrive anywhere they can find food and shelter. They are also widespread in suburban and urban areas, where they can take advantage of human food supplies; however, they prefer to stay away from large industrial areas. [25] In certain areas, foxes tend to do better where humans are present, including in many agricultural landscapes, [26] forests and patchy woodlands.

Behavior and ecology

Most true foxes are nocturnal, but they can be active during the morning and dusk and occasionally hunt and scavenge in daylight during winter. Many fox species are solitary or nomadic, living most of their lives on their own, except for the mating season, when they have a monogamous relationship with a partner. Some live in small family groups, others are more gregarious. [27]

Vulpes have a high variation in social organization between species and populations. Their hierarchical society usually depends on population densities. [28] As population density increases, there is also an increase in the formation of social groups. These groups consist of one dominant pair and a few other subordinate adults that tend to be related. Dominance is established within the den, and dominant kits have usually more access to food and often hold higher social status. If a dispute occurs, dominance is determined by fighting, and the loser may be rejected from its group. These social groups can consist of up to ten adults. [28] [29] Cape foxes likely have a matriarchal social organization. [30]

Diet

This genus is omnivorous and prone to scavenging. The foods of choice for Vulpes consist of invertebrates, a variety of small vertebrates, grasses, and some angiosperms. The typical intake per day is about 1 kg. True foxes exhibit hoarding behavior or caching where they store away food for another day out of sight from other animals. [31]

Predators

Adult foxes have very few predators except coyotes, bears, and wolves, depending on the location. Juvenile foxes face a wider range of threats from small carnivores and large birds of prey, such as eagles. [19]

Reproduction

Most true foxes are monogamous. However, they can form polyandrous and polygynous pairs. [32] Breeding season varies between species and habitat, but they generally breed between late December and late March. [19] Most foxes dig out dens to provide a safe underground space for raising their young. [33] Born deaf and blind, kits or cubs require their mother's milk and complete supervision for the first four to five weeks out of the womb, but begin to be progressively weaned after the first month. Once fully weaned, kits seek out various insects. The parents supplement this diet with a variety of mammals and birds. During early to middle July, the kits are able to hunt on their own and soon move away from their parents. [34]

Relationship with humans

Domestication

The silver fox is a melanistic form of the wild red fox. Though rare, domestication has been documented in silver foxes. The most notable experiment was conducted in Novosibirsk, Russia, at the Siberian Institute of Cytology and Genetics. [35] In this study, generations of silver foxes were divided into those with friendly traits and those with unfriendly traits. [36] After 50 years, the friendly foxes developed “dog-like” domesticated traits such as spots, tail wagging, enjoyment of human touch, and barking. [37]

Fox hunting

Fox hunting was started in the United Kingdom in the 16th century that involves tracking, chasing, and killing a fox with the aid of foxhounds and horses. It has since then spread to Europe, the United States, and Australia. [38]

Vulpes in culture and literature

Related Research Articles

<span class="mw-page-title-main">Canidae</span> Family of mammals

Canidae is a biological family of dog-like carnivorans, colloquially referred to as dogs, and constitutes a clade. A member of this family is also called a canid. The family includes three subfamilies: the Caninae, and the extinct Borophaginae and Hesperocyoninae. The Caninae are known as canines, and include domestic dogs, wolves, coyotes, foxes, jackals and other species.

<span class="mw-page-title-main">Fox</span> Genera of mammal

Foxes are small-to-medium-sized omnivorous mammals belonging to several genera of the family Canidae. They have a flattened skull; upright, triangular ears; a pointed, slightly upturned snout; and a long, bushy tail ("brush").

<span class="mw-page-title-main">Fennec fox</span> Species of fox

The fennec fox is a small fox native to the deserts of North Africa, ranging from Western Sahara and Mauritania to the Sinai Peninsula. Its most distinctive feature is its unusually large ears, which serve to dissipate heat and listen for underground prey. The fennec is the smallest fox species. Its coat, ears, and kidney functions have adapted to the desert environment with high temperatures and little water.

<span class="mw-page-title-main">Bat-eared fox</span> Species of carnivorans

The bat-eared fox is a species of fox found on the African savanna. It is the only extant species of the genus Otocyon and an ancient (basal) canid species. Fossil records indicate this canid first appeared during the middle Pleistocene. There are two separate populations of the bat-eared fox, each of which makes up a subspecies. The bat referred to in its colloquial name is possibly the Egyptian slit-faced bat, which is abundant in the region and has very large ears. Other vernacular names include big-eared fox, black-eared fox, long-eared fox, Delalande's fox, cape fox, and motlosi.

<i>Urocyon</i> Genus of carnivores

Urocyon is a genus of Canidae which includes the gray fox and the island fox. These two fox species are found in the Western Hemisphere. Whole genome sequencing indicates that Urocyon is the most basal genus of the living canids. Fossils of what is believed to be the ancestor of the gray fox, Urocyon progressus, have been found in Kansas and date to the Upper Pliocene, with some undescribed specimens dating even older.

<i>Canis</i> Genus of carnivores

Canis is a genus of the Caninae which includes multiple extant species, such as wolves, dogs, coyotes, and golden jackals. Species of this genus are distinguished by their moderate to large size, their massive, well-developed skulls and dentition, long legs, and comparatively short ears and tails.

<span class="mw-page-title-main">Cape fox</span> Species of carnivore

The Cape fox, also called the asse, cama fox or the silver-backed fox, is a small species of fox, native to southern Africa. It is also called a South African version of a fennec fox due to its similarly big ears. It is the only "true fox" occurring in sub-Saharan Africa, and it retains primitive characteristics of Vulpes because it diverged early in the evolutionary history of the group.

<span class="mw-page-title-main">South American fox</span> Genus of carnivores

The South American foxes (Lycalopex), commonly called raposa in Portuguese, or zorro in Spanish, are a genus from South America of the subfamily Caninae. Despite their name, they are not true foxes, but are a unique canid genus more closely related to wolves and jackals than to true foxes; some of them resemble foxes due to convergent evolution. The South American gray fox, Lycalopex griseus, is the most common species, and is known for its large ears and a highly marketable, russet-fringed pelt.

<span class="mw-page-title-main">Caniformia</span> Suborder of mammals

Caniformia is a suborder within the order Carnivora consisting of "dog-like" carnivorans. They include dogs, bears, raccoons, and mustelids. The Pinnipedia are also assigned to this group. The center of diversification for the Caniformia is North America and northern Eurasia. Caniformia stands in contrast to the other suborder of Carnivora, the Feliformia, the center of diversification of which was in Africa and southern Asia.

<span class="mw-page-title-main">Tibetan fox</span> Species of true fox

The Tibetan fox, also known as the Tibetan sand fox, is a species of true fox endemic to the high Tibetan Plateau, Ladakh plateau, Nepal, China, Sikkim, and Bhutan, up to elevations of about 5,300 m (17,400 ft). It is listed as Least Concern in the IUCN Red List, on account of its widespread range in the Tibetan Plateau's steppes and semi-deserts.

<span class="mw-page-title-main">Blanford's fox</span> Species of carnivore

Blanford's fox is a small fox native to West Asia, Central Asia and parts of South Asia. It is listed as Least Concern on the IUCN Red List.

<span class="mw-page-title-main">Sechuran fox</span> Species of carnivore

The Sechuran fox, also called the Peruvian desert fox or the Sechuran zorro, is a small South American species of canid closely related to other South American "false" foxes or zorro. It gets its name for being found in the Sechura Desert in northwestern Peru.

<span class="mw-page-title-main">Side-striped jackal</span> Canine native to Africa

The side-striped jackal is a canine native to Central and Southern Africa.

<span class="mw-page-title-main">Borophaginae</span> Extinct subfamily of carnivores

The extinct Borophaginae form one of three subfamilies found within the canid family. The other two canid subfamilies are the extinct Hesperocyoninae and extant Caninae. Borophaginae, called "bone-crushing dogs", were endemic to North America during the Oligocene to Pliocene and lived roughly 34—2.5 million years ago, existing for about 33.5 million years.

<span class="mw-page-title-main">Corsac fox</span> Species of carnivore

The corsac fox, also known simply as a corsac, is a medium-sized fox found in steppes, semi-deserts and deserts in Central Asia, ranging into Mongolia and northern China. Since 2004, it has been classified as least concern by IUCN, but populations fluctuate significantly, and numbers can drop tenfold within a single year. It is also known as the steppe fox. The word "corsac" is derived from the Russian name for the animal, "korsák" (корса́к), derived ultimately from Turkic "karsak".

<span class="mw-page-title-main">Pale fox</span> Species of carnivore

The pale fox is a species of fox found in the band of African Sahel from Senegal in the west to Sudan in the east. It is one of the least studied of all canid species, in part due to its remote habitat and its sandy coat that blends in well with the desert-like terrain. The pale fox is distinguished by its light-colored fur and oversized ears, which enable it to excel in camouflage and survival in harsh environments.

<span class="mw-page-title-main">Rüppell's fox</span> Species of carnivore

Rüppell's fox, also called Rüppell's sand fox, is a fox species living in desert and semi-desert regions of North Africa, the Middle East, and southwestern Asia. It has been listed as Least Concern on the IUCN Red List since 2008. It is named after the German naturalist Eduard Rüppell.

<span class="mw-page-title-main">Caninae</span> Subfamily of carnivores

Caninae is the only living subfamily within Canidae, alongside the extinct Borophaginae and Hesperocyoninae. They first appeared in North America, during the Oligocene around 35 million years ago, subsequently spreading to Asia and elsewhere in the Old World at the end of the Miocene, some 7 million to 8 million years ago.

Vulpes riffautae is an extinct species of fox from the late Miocene of Chad. Fossils of V. riffautae potentially represent the earliest record of the dog family, Canidae, in the Old World. V. riffautae was intermediate in size between Rüppell's fox and the fennec fox. The mandible is narrow and shallow. Just before the posterior root of p2, the symphysis terminates. The masseteric fossa is rather deep. The posterior smaller mental foramen is located below the posterior root of p3, while the anterior larger mental foramen is located between the root of p1 and the anterior root of p2.

<span class="mw-page-title-main">Red fox</span> Species of mammal

The red fox is the largest of the true foxes and one of the most widely distributed members of the order Carnivora, being present across the entire Northern Hemisphere including most of North America, Europe and Asia, plus parts of North Africa. It is listed as least concern on the IUCN Red List. Its range has increased alongside human expansion, having been introduced to Australia, where it is considered harmful to native small and medium-sized rodents and marsupials. Due to its impact on native species, it is included on the list of the "world's 100 worst invasive species".

References

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