What are fox related to?

If you’ve ever seen a fox in the wild or even at the zoo, you probably thought that it looked similar to dogs you’ve seen in the past. Granted, some foxes look more like rodents or marsupials than dogs. But your standard red fox, one of the most prevalent and far-reaching carnivorous species on the planet, looks like a long, slender dog. Are they related? The answer is kind of… Let’s take a look at the fox family tree for clarification.

Scientists group animals according to shared physical and genetic characteristics. These groupings add up to the animal kingdom hierarchy, which includes classes, orders, families, genera, and species. Each step up becomes more specific, with species being the most specific group in the hierarchy.

When we talk about foxes, we’re actually talking about several species. Each type of fox is technically its own species. For example, there’s the common red fox, which is the one you’re most likely to encounter in the wild. Other fox species include the arctic fox, the gray fox, and Darwin’s fox, just to name a few.

There are 37 different fox species in total. However, only 12 of them are “true” fox species in that they’re part of the genus Vulpes. Now you can see how the breakdown starts to work. There are 12 foxes, including red foxes, arctic foxes, and Darwin’s foxes, that are all part of the same Vulpes genus.

As we continue down the list, each category will become broader, encompassing more animals within its boundaries. The next step down is family, which is where we come across the family Canidae. Members of the Canidae family are referred to as canids.

If Canidae and canid are starting to sound familiar to you, it might be from another common word that you almost certainly know; canine. Canines are known as man’s best friend, and the name canine comes from the family they’re a part of, which is the Canidae family. This makes foxes and dogs sort of like cousins. They’re part of the same family, but they’re different genera and very different species.

Interestingly, foxes and dogs have one more thing in common. They’ve both been domesticated by people. Recent evidence shows that foxes were domesticated by humans long ago in the Bronze Age.

Of course, dogs aren’t the only cousins to foxes within the Canidae family that most people know. This same family also includes both wolves and coyotes.

So, it turns out that foxes are related to dogs. They’re sort of like distant cousins. Both of them are members of the Canidae family, but they’re completely separate species and genera. Still, their differences are noticeable, even in appearance. Maybe with further domestication, foxes could become man’s other best friend.

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We did some research and reached out to an expert to find out how closely related foxes and dogs actually are and why — unlike your adorable pup — they don’t make good pets.

Foxes are part of the dog family, Canidae, which also includes domestic dogs, wolves, coyotes, jackals, dingoes and other canines.

“The nomenclature ‘canines’ is a common reference to animals that are members of the family Canidae,” Bridgett M. vonHoldt, a faculty member at Princeton University’s Lewis-Sigler Institute for Integrative Genomics, told The Dodo.

But while part of the same family, dogs (and wolves) are part of the genus Canis, while most types of foxes are from the genus Vulpes.

“There are roughly more than 10 million years of evolutionary time that separate domestic dogs and red foxes,” vonHoldt said.

There are some types of foxes who are part of other genuses, though, like the gray fox, the Arctic fox, the bat-eared fox and the crab-eating fox — but none in the Canis genus.

Other than the fact that one’s a wild animal and one is probably trying to climb onto the couch while you’re reading this, there are actually a lot of differences between dogs and foxes.

“Dogs and foxes have different numbers of chromosomes,” vonHoldt said. Basically, that means dogs and foxes are genetically unique.

Also, foxes are wild animals, while dogs can be domesticated. It can be super dangerous to try to adopt a fox into your family, so it’s definitely not recommended. Plus, domesticating a fox is illegal, according to vonHoldt.

“They are wild species and protected as wildlife species,” vonHoldt added.

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").

Twelve species belong to the monophyletic "true fox" group of genus Vulpes. Approximately another 25 current or extinct species are always or sometimes called foxes; these foxes are either part of the paraphyletic group of the South American foxes, or of the outlying group, which consists of the bat-eared fox, gray fox, and island fox.

Foxes live on every continent except Antarctica. The most common and widespread species of fox is the red fox (Vulpes vulpes) with about 47 recognized subspecies. The global distribution of foxes, together with their widespread reputation for cunning, has contributed to their prominence in popular culture and folklore in many societies around the world. The hunting of foxes with packs of hounds, long an established pursuit in Europe, especially in the British Isles, was exported by European settlers to various parts of the New World.

The word fox comes from Old English, which derived from Proto-Germanic *fuhsaz. This in turn derives from Proto-Indo-European *puḱ-, meaning ’thick-haired; tail’. Male foxes are known as dogs, tods or reynards, females as vixens, and young as cubs, pups, or kits, though the last name is not to be confused with a distinct species called kit foxes. Vixen is one of very few words in modern English that retain the Middle English southern dialect "v" pronunciation instead of "f" (i.e. northern English "fox" versus southern English "vox"). A group of foxes is referred to as a skulk, leash, or earth.

Within the Canidae, the results of DNA analysis shows several phylogenetic divisions:

Foxes are generally smaller than some other members of the family Canidae such as wolves and jackals, while they may be larger than some within the family, such as Raccoon dogs. In the largest species, the red fox, males weigh on average between 4.1 and 8.7 kilograms (9 and 19+1⁄4 pounds), while the smallest species, the fennec fox, weighs just 0.7 to 1.6 kg (1+1⁄2 to 3+1⁄2 lb).

Fox features typically include a triangular face, pointed ears, an elongated rostrum, and a bushy tail. They are digitigrade (meaning they walk on their toes). Unlike most members of the family Canidae, foxes have partially retractable claws. Fox vibrissae, or whiskers, are black. The whiskers on the muzzle, known as mystacial vibrissae, average 100–110 millimetres (3+7⁄8–4+3⁄8 inches) long, while the whiskers everywhere else on the head average to be shorter in length. Whiskers (carpal vibrissae) are also on the forelimbs and average 40 mm (1+5⁄8 in) long, pointing downward and backward. Other physical characteristics vary according to habitat and adaptive significance.

Fox species differ in fur color, length, and density. Coat colors range from pearly white to black-and-white to black flecked with white or grey on the underside. Fennec foxes (and other species of fox adapted to life in the desert, such as kit foxes), for example, have large ears and short fur to aid in keeping the body cool. Arctic foxes, on the other hand, have tiny ears and short limbs as well as thick, insulating fur, which aid in keeping the body warm. Red foxes, by contrast, have a typical auburn pelt, the tail normally ending with a white marking.

A fox's coat color and texture may vary due to the change in seasons; fox pelts are richer and denser in the colder months and lighter in the warmer months. To get rid of the dense winter coat, foxes moult once a year around April; the process begins from the feet, up the legs, and then along the back. Coat color may also change as the individual ages.

A fox's dentition, like all other canids, is I 3/3, C 1/1, PM 4/4, M 3/2 = 42. (Bat-eared foxes have six extra molars, totalling in 48 teeth.) Foxes have pronounced carnassial pairs, which is characteristic of a carnivore. These pairs consist of the upper premolar and the lower first molar, and work together to shear tough material like flesh. Foxes' canines are pronounced, also characteristic of a carnivore, and are excellent in gripping prey.

In the wild, the typical lifespan of a fox is one to three years, although individuals may live up to ten years. Unlike many canids, foxes are not always pack animals. Typically, they live in small family groups, but some (such as Arctic foxes) are known to be solitary.

Foxes are omnivores. Their diet is made up primarily of invertebrates such as insects and small vertebrates such as reptiles and birds. They may also eat eggs and vegetation. Many species are generalist predators, but some (such as the crab-eating fox) have more specialized diets. Most species of fox consume around 1 kg (2.2 lb) of food every day. Foxes cache excess food, burying it for later consumption, usually under leaves, snow, or soil. While hunting, foxes tend to use a particular pouncing technique, such that they crouch down to camouflage themselves in the terrain and then use their hind legs to leap up with great force and land on top of their chosen prey. Using their pronounced canine teeth, they can then grip the prey's neck and shake it until it is dead or can be readily disemboweled.

The gray fox is one of only two canine species known to regularly climb trees; the other is the raccoon dog.

The male fox's scrotum is held up close to the body with the testes inside even after they descend. Like other canines, the male fox has a baculum, or penile bone. The testes of red foxes are smaller than those of Arctic foxes. Sperm formation in red foxes begins in August–September, with the testicles attaining their greatest weight in December–February.

Vixens are in heat for one to six days, making their reproductive cycle twelve months long. As with other canines, the ova are shed during estrus without the need for the stimulation of copulating. Once the egg is fertilized, the vixen enters a period of gestation that can last from 52 to 53 days. Foxes tend to have an average litter size of four to five with an 80 percent success rate in becoming pregnant. Litter sizes can vary greatly according to species and environment – the Arctic fox, for example, can have up to eleven kits.

The vixen usually has six or eight mammae. Each teat has 8 to 20 lactiferous ducts, which connect the mammary gland to the nipple, allowing for milk to be carried to the nipple.

The fox's vocal repertoire is vast, and includes:

In the case of domesticated foxes, the whining seems to remain in adult individuals as a sign of excitement and submission in the presence of their owners.

Canids commonly known as foxes include the following genera and species:

Several fox species are endangered in their native environments. Pressures placed on foxes include habitat loss and being hunted for pelts, other trade, or control. Due in part to their opportunistic hunting style and industriousness, foxes are commonly resented as nuisance animals. Contrastingly, foxes, while often considered pests themselves, have been successfully employed to control pests on fruit farms while leaving the fruit intact.

The island fox, though considered a near-threatened species throughout the world, is becoming increasingly endangered in its endemic environment of the California Channel Islands. A population on an island is smaller than those on the mainland because of limited resources like space, food and shelter. Island populations are therefore highly susceptible to external threats ranging from introduced predatory species and humans to extreme weather.

On the California Channel Islands, it was found that the population of the island fox was so low due to an outbreak of canine distemper virus from 1999 to 2000 as well as predation by non-native golden eagles. Since 1993, the eagles have caused the population to decline by as much as 95%. Because of the low number of foxes, the population went through an Allee effect (an effect in which, at low enough densities, an individual's fitness decreases). Conservationists had to take healthy breeding pairs out of the wild population to breed them in captivity until they had enough foxes to release back into the wild. Nonnative grazers were also removed so that native plants would be able to grow back to their natural height, thereby providing adequate cover and protection for the foxes against golden eagles.

Darwin's fox is considered critically endangered because of their small known population of 250 mature individuals as well as their restricted distribution. On the Chilean mainland, the population is limited to Nahuelbuta National Park and the surrounding Valdivian rainforest. Similarly on Chiloé Island, their population is limited to the forests that extend from the southernmost to the northwesternmost part of the island. Though the Nahuelbuta National Park is protected, 90% of the species live on Chiloé Island.

A major issue the species faces is their dwindling, limited habitat due to the cutting and burning of the unprotected forests. Because of deforestation, the Darwin's fox habitat is shrinking, allowing for their competitor's (chilla fox) preferred habitat of open space, to increase; the Darwin's fox, subsequently, is being outcompeted. Another problem they face is their inability to fight off diseases transmitted by the increasing number of pet dogs. To conserve these animals, researchers suggest the need for the forests that link the Nahuelbuta National Park to the coast of Chile and in turn Chiloé Island and its forests, to be protected. They also suggest that other forests around Chile be examined to determine whether Darwin's foxes have previously existed there or can live there in the future, should the need to reintroduce the species to those areas arise. And finally, the researchers advise for the creation of a captive breeding program, in Chile, because of the limited number of mature individuals in the wild.

Foxes are often considered pests or nuisance creatures for their opportunistic attacks on poultry and other small livestock. Fox attacks on humans are not common. Many foxes adapt well to human environments, with several species classified as "resident urban carnivores" for their ability to sustain populations entirely within urban boundaries. Foxes in urban areas can live longer and can have smaller litter sizes than foxes in non-urban areas. Urban foxes are ubiquitous in Europe, where they show altered behaviors compared to non-urban foxes, including increased population density, smaller territory, and pack foraging. Foxes have been introduced in numerous locations, with varying effects on indigenous flora and fauna.

In some countries, foxes are major predators of rabbits and hens. Population oscillations of these two species were the first nonlinear oscillation studied and led to the derivation of the Lotka–Volterra equation.

Fox hunting originated in the United Kingdom in the 16th century. Hunting with dogs is now banned in the United Kingdom, though hunting without dogs is still permitted. Red foxes were introduced into Australia in the early 19th century for sport, and have since become widespread through much of the country. They have caused population decline among many native species and prey on livestock, especially new lambs. Fox hunting is practiced as recreation in several other countries including Canada, France, Ireland, Italy, Russia, United States and Australia.

There are many records of domesticated red foxes and others, but rarely of sustained domestication. A recent and notable exception is the Russian silver fox, which resulted in visible and behavioral changes, and is a case study of an animal population modeling according to human domestication needs. The current group of domesticated silver foxes are the result of nearly fifty years of experiments in the Soviet Union and Russia to domesticate the silver morph of the red fox. This selective breeding resulted in physical and behavioral traits appearing that are frequently seen in domestic cats, dogs, and other animals, such as pigmentation changes, floppy ears, and curly tails. Notably, the new foxes became more tame, allowing themselves to be petted, whimpering to get attention and sniffing and licking their caretakers.

In 2018, a Clapham fox bit a woman on the arm after she had left the door to her flat open.

Foxes are among the comparatively few mammals which have been able to adapt themselves to a certain degree to living in urban (mostly suburban) human environments. Their omnivorous diet allows them to survive on discarded food waste, and their skittish and often nocturnal nature means that they are often able to avoid detection, despite their larger size.

Urban foxes have been identified as threats to cats and small dogs, and for this reason there is often pressure to exclude them from these environments.

The San Joaquin kit fox is a highly endangered species that has, ironically, become adapted to urban living in the San Joaquin Valley and Salinas Valley of southern California. Its diet includes mice, ground squirrels, rabbits, hares, bird eggs, and insects, and it has claimed habitats in open areas, golf courses, drainage basins, and school grounds.

The fox appears in many cultures, usually in folklore. There are slight variations in their depictions. In Western and Persian folklore, foxes are symbols of cunning and trickery—a reputation derived especially from their reputed ability to evade hunters. This is usually represented as a character possessing these traits. These traits are used on a wide variety of characters, either making them a nuisance to the story, a misunderstood hero, or a devious villain.

In Asian folklore, foxes are depicted as familiar spirits possessing magic powers. Similar to in Western folklore, foxes are portrayed as mischievous, usually tricking other people, with the ability to disguise as an attractive female human. Others depict them as mystical, sacred creatures who can bring wonder and/or ruin. Nine-tailed foxes appear in Chinese folklore, literature, and mythology, in which, depending on the tale, they can be a good or a bad omen. The motif was eventually introduced from Chinese to Japanese and Korean cultures.

The constellation Vulpecula represents a fox.

The fox is a member of the Canidae family, which also includes wolves and dogs. They do, however, share several interesting characteristics with cats. Some foxes, for example, have vertical pupils and can climb trees. Both animals belong to the Canidae family.