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The Grey Wolf (Canis lupus), also known colloquially as the wolf, is a mammal of the Canidae family and the ancestor of the domestic dog. Wolves once had an almost worldwide distribution, but are now limited primarily to North America, Eurasia, and the Middle East. Their preference on habitat ranges among forests, tundra, taigas, plains, and mountains. In the Northern Hemisphere, human encroachment on their habitat and persecution of the animals themselves have drastically reduced their range. The wolf is today frequently in the line of fire in conflicts between many different interests: tourism versus industry, city versus country, as well as conservation versus exploitation.

Since the wolf is an apex predator, the state of the wolf can frequently be seen as a state of the land where it lives. Wolves are still endangered after being hunted down in the 1600s. Carolus Linnaeus gave the wolf the scientific name Canis lupus in the 1700s.^[1]

The wolf anatomy differs on several points from the dog. The wolf usually has golden-yellow eyes, longer legs, larger paws, more pronounced jaws, a longer muzzle, and a brain that is typically 30 percent larger than that of a dog.^[2] Also noticeable is a pre-caudal gland on the over side of the tail, close to the base, that is not present on dogs. Lastly, whereas the elbows of many dogs stick more out to the sides of their bodies, the elbows of a wolf point inwards towards their belly, almost touching. This allows wolves to run at speeds of around 25–35 miles per hour (40–56 km/h) for hours on end.^[3]

A wolf often seems more massive than a dog of comparable weight due to the extra bulk of the coat. The coat is built up of two layers, with hard guard hairs to repel water and dirt and a thick, woolly undercoat to keep it warm. The wolf changes coat two times a year, during spring and autumn. Females tend to have a thicker winter coat and keep it further into the spring than males.

The wolves and most larger dogs share the same tooth configuration: The upper jaw has 6 incisors, 2 canines, 8 premolars, and 4 molars. The bottom jaw has 6 incisors, 2 canines, 8 premolars, and 6 molars.^[4] The canines are by far most important, as they are used to catch and hold prey. One common reason that wolves starve is due to tooth damage after suffering a kick by larger prey.

Wolves stand approximately 0.66– 0.8 m (26–32 in) at the shoulder and weigh 25–52 kg (55–115 lb), with females being about 20 percent smaller than males.^[5][6] They measure 1–1.5 m (40–58 in) long, with the tail consisting roughly a third of their body length (0.67–0.5 m, 13–20 in). The body of the wolf is built for long distance running, with a rather thin chest and powerful back and leg muscles. Wolves can travel over great distances, and their wide paws ensure deep snow hampers them less than their prey.

Coloration runs from grey to grey-brown but can vary through the canine spectrum of white, reddish, brown, and black. A wolf's coat usually lacks any clear patterns save for markings around the eyes. Fur colorations often mimic the colors of a wolf's surroundings; for example, in regions where there is continual snowfall, white wolves are far more common.^[7] Aging wolves acquire a greyish tint in their coat.

See also Pack (canine).

Wolves function as social predators and hunt in packs organized according to a strict social hierarchy and led by an alpha male and alpha female. This social structure was originally thought to allow the wolf to take prey many times its size. However, emerging new theories suggest the pack strategy instead maximizes reproductive success and has less to do with hunting.

The size of the pack may change over time and is controlled by factors including habitat type, personalities of individual wolves within a pack, and food supply. Packs can contain between 2–20 animals, though an average pack consists of 6 or 7 members.^[8][9] The hierarchy or rank order of the pack is relatively strict, with the alphas (one male, one female) at top and the omega at the bottom. The hierarchy affects all activity in the pack, from which wolf eats first to which is allowed to breed (generally only the alpha pair).

New packs are formed when a wolf leaves its birth pack and claims a territory. Wolves searching for other wolves with which to form packs can travel very long distances in search of suitable territories. Dispersing individuals must avoid the territories of other wolves because intruders on "owned" territories are chased away or killed. This possibly explains wolf "predation" of dogs. Most dogs, except perhaps large, specially bred attack dogs, do not have much of a chance against a wolf protecting its territory from the unwanted intrusion.

The alpha pair has the most social freedom of all the animals in a pack, but they are not "leaders" in the sense humans usually think of the term. They do not give the other wolves orders; the alphas simply have the most liberty to choose where they would like to go and what they would like to do, and the rest of the pack usually follows. In larger packs, there may be betas, a second-in-commands to the alphas, and the omegas, the lowest-ranking member of the pack.^[10]

While most alpha pairs are monogamous with each other, there are exceptions.^[11] An alpha animal may preferentially mate with a lower ranking animal, especially if the other alpha is closely related (a brother or sister, for example). Wolves also do not "mate for life". The death of one alpha does not affect the status of the other alpha, who will usually just take another mate. Usually, only the alpha pair is able to successfully rear a litter of pups. (Other wolves in a pack may breed, and may even produce pups, but usually they lack the freedom or the resources to raise the pups to maturity.) All the wolves in the pack assist in raising wolf pups. Some pups may choose to stay in the original pack to reinforce it and help rear more pups while others disperse.

Rank order is established and maintained through a series of ritualized fights and posturings best described as ritual bluffing. Wolves prefer psychological warfare to actual fighting, and high-ranking status is based more on personality or attitude than on size or physical strength. Rank, who holds it, and how it is enforced varies widely between packs and between individual animals. In large packs full of easygoing animals, or in a group of juvenile animals, rank order may shift almost constantly, or even be circular (e.g. - animal A dominates animal B, who dominates animal C, who dominates animal A).

Loss of rank can happen gradually or suddenly. An older wolf may simply choose to give way when an ambitious challenger presents itself, and rank will shift without bloodshed. On the other hand, the older animal may choose to fight back, with varying degrees of intensity. While an extremely high percentage of wolf aggression is non-damaging and ritualized, a high-stakes fight can result in injury. The loser of such a damaging fight is frequently chased away from the pack, or, rarely, may be killed as other aggressively aroused wolves attempt to join in. This kind of dominance fight is more common in the winter months, when mating occurs.

See also Dog communication.

Wolves, like human beings, do not just communicate by sound (e.g. - yipping, growling, and howling), but also by body language. This ranges from subtle signals such as a slight shift in weight, to much more obvious things like rolling on the back as a sign of submission.^[12]

• Dominance - A dominant wolf stands stiff-legged and tall. The ears are erect and forward, and the hackles bristle slightly. Often the tail is held vertical and curled toward the back. This display shows the wolf's rank to all others in the pack. A dominant lupine may stare penetratingly at a submissive one, pin the other to the ground, or even stand on its hind legs.

• Submission (Active) - In active submission, the entire body is lowered, and the lips and ears are drawn back. Sometimes active submission is accompanied by a rapid thrusting out of the tongue, and lowering of the hindquarters. The tail is placed down, or halfway or fully between the legs, and the muzzle often points up to the more dominant animal. The back may be partially arched as the submissive wolf humbles itself to its superior. (A more arched back and more tucked tail indicates a greater level of submission.)

• Submission (Passive) - Passive submission is more intense than active submission. The wolf rolls on its back and exposes its vulnerable throat and underside. The paws are drawn into the body. This is often accompanied by whimpering.

• Anger - An angry lupine's ears are erect, and its fur bristles. The lips may curl up or pull back, and the incisors are displayed. The wolf may also snarl.

• Fear - A frightened wolf tries to make its body look small, and therefore less conspicuous. The ears flatten down against the head, and the tail may be tucked between the legs, as with a submissive wolf. There may also be whimpering or barks of fear, and the wolf may arch its back.

• Defensive - A defensive wolf flattens its ears against its head.

• Aggression - An aggressive wolf snarls and its fur bristles. The wolf may crouch, ready to attack if need be.

• Suspicion - Pulling back of the ears shows a lupine is suspicious. In addition, the wolf narrows its eyes. The tail of a wolf that senses danger points straight out, parallel to the ground.

• Relaxedness - A relaxed wolf's tail points straight down, and the wolf may rest sphinx-like or on its side. The wolf's tail may also wag. The further down the tail droops, the more relaxed the wolf is.

• Tension - An aroused wolf's tail points straight out, and the wolf may crouch as if ready to spring.

• Happiness - As dogs do, a lupine may wag its tail if it is in a joyful mood. The tongue may loll out of the mouth.

• Hunting - A wolf that is hunting is tensed, and therefore the tail is horizontal and straight.

• Playfulness - A playful lupine holds its tail high and wags it. The wolf may frolic and dance around, or bow by placing the front of its body down to the ground, while holding the rear high, sometimes wagged. This is reminiscent of the playful behavior executed in domestic dogs.

Wolves are noted for their distinctive howl. There are several possible reasons for the howling. It can be said at the outset that wolves do not howl when attacking their prey. In fact, it has been shown that prey animals don't even react to the sound. Perhaps they simply fail to make the connection between noise and predator.

The most obvious reason for wolves to howl is to keep in touch; it is difficult to think of a better way for a lupine pack to communicate in a thickly forested area or over great distances. Howls are also employed to summon pack members to a location.^[13] However, howling also occurs when a pack is together, so there must be some other purpose. Observations of wolf packs suggest that howling often occurs at summer sunsets preceding the adults' departure to the hunt. This is repeated when they return at sunup.

Some scientists speculate that these group howling sessions strengthen the wolves' social bonds and comradeship— similar to community singing among humans. Howling may also be a form of territorial advertisement and declaration. Studies have shown that the dominant animals in a pack are more likely to answer a human imitation of a 'rival' pack when residing in an area that is indisputably theirs.

Wolves howl more frequently in the evening and the early morning, especially during winter and spring breeding and pup-rearing. The pups themselves, however, towards the end of July and on into the next two months, are a different matter entirely. They howl at the least provocation and stimulus. This may be because the adults often leave them at a 'rendezvous site' to go off hunting. Their loneliness may cause them to try and make contact with what they interpret to be a returning pack member.

Wolves also howl when they have something to protect, such as a fresh kill. When they wish to avoid conflict with other packs, they howl less frequently.

The wolf is a carnivore. Packs of wolves hunt any large herbivores in their range, while lone wolves are more prone to consume smaller animals. The hunting methods range from surprise attacks to long-lasting chases. Through the cooperation of a pack, wolves are able to pursue large prey for several hours before relenting, but the success rate is rather low. Solitary wolves catch small animals by pouncing and pinning them to the ground with their front paws, a technique also exhibited by foxes and coyotes. Wolves' diets include but are not limited to large mammals such as elk, caribou, moose and deer; they also prey on beavers, hares, rodents, and other small animals.^[14]

When attacking, wolves generally target the neck, throat, and sides of an animal. Wolf packs mostly kill and feast on the weak, elderly, and sick animals since large, healthy mammals can outrun and fight against wolves. In one study, less than 1 out of 10 chases of moose resulted in a successful kill.^[15]

Normally, only the alpha pair of the pack breeds. This kind of organization also occurs in other pack-hunting canids, such as the Dhole and the African Hunting Dog. Mating usually occurs in February to May and wolves, unlike dogs, only mate once a year. Another interesting fact about the social economy of wolves is that they are usually monogamous: the alpha pair will ordinarily mate exclusively with each other so long as they both remain alphas. There are times when one of the alphas will attempt to mate with a subordinate wolf, and if the other alpha is unable to prevent it, multiple litters can be born. This has been documented in Yellowstone amongst other places and usually occurs in large packs with plenty of available prey.

The gestation period is 60 to 63 days, and the pups are born blind and completely dependent on their mother. There are 1–14 pups per litter, with the average litter size being 6 or 7 pups. Pups reside in the den in which they are born until they reach 8–10 weeks of age. The mother usually stays with her litter alone for the first 3 weeks, but all members of the pack eventually help rear the pups. Pups consume food regurgitated by older wolves until they are 45 days old. They are fed meat provided by pack members after that age.^[16]

Female pups reach sexual maturity at 2 years of age, whilst males do so at 3 years of age. Most wolves leave their birth pack when they are 1–3 years old.

Wolves typically live 6–9 years in the wilderness, although in captivity they live 16 years on average. The record lifespan of a wolf is about 20 years of age.^[17] However, the mean age of wolves is rather low. The mortality among pups is high, and few survive the first winter. The most significant mortality factors for grown wolves are hunting and poaching by humans, car accidents, and wounds from hunting prey. All diseases that affect domestic dogs also affect wolves, including mange and rabies, and can from time to time wipe out the wolf population in an area. Wolves adjust rather well to fluctuations in prey populations, so mass starvation is unusual. Wolves are able to sustain their population under a heavy pressure, as long as the alpha pairs are not killed.

The relationship between people and wolves has had a very long and turbulent history. Historically, humans have often viewed wolves as a great danger or as nuisance to be destroyed. An opposing view, held by most biologists and naturalists, postulates that wolves form a valuable part of the ecosystem by hunting down animals such as deer— whose population would grow out of control if it were not for wolves— and require protection. Often, these views occur simultaneously and cause conflicts among differing groups of people, as one sees when a wildlife service or organization attempts to preserve endangered wolves or to reintroduce wolves to a habitat, like the rare and almost extinct Red Wolf.

In the late 20th century, an increased awareness of the beneficial nature of wolves arose, encouraged by books like Never Cry Wolf by Farley Mowat and nature documentaries as well as by classification of the species as endangered. Accordingly, while the stereotype of wolves still has influence, a significant portion of the public has gained a positive opinion of wolves as interesting, valuable, and even noble animals. Thus, parks with a visible wolf population have often become popular tourist attractions. For instance, visitation to Yellowstone National Park has shown an increase partially due to the wolf reintroduction program and the hope of spotting a wolf.

Such organizations as the International Wolf Center and Mission: Wolf attempt to educate people about the true nature of wolves, and such action proves helpful to the reintroduction process, especially in places such as Yellowstone National Park.

In other parks, tourists often participate in wolf howls, trying to produce wolf-like howls in hopes that the resident wolves will answer. In fact, some nature-lovers have complained that this popularity has drawbacks since tourists sometimes intrude into wolf habitats and disturb them.

The large amount of research done on the wolf in the past half century has also helped to educate people and make them realize how sociologically similar humans are to wolves, and how they have nothing to fear from these shy, majestic animals. Biologists such as L. David Mech and Luigi Boitani have been major leaders in wolf research.

Nature documentaries have also played a role in changing attitudes. For instance, the film evidence of the wolf being a very social animal and devoted parent to its young enlightened and charmed many viewers to a softer side to the feared predator.

In the United States, wolves are repopulating where they were eradicated, and numbers have been increasing in Alaska and Minnesota, where some packs remained in the deep forests despite bounty hunting and other past eradication efforts. Not only are they slowly but surely coming back naturally from Canada, they are also being successfully reintroduced in some states such as Idaho and Wyoming. It is curious to note that some ranchers prefer reintroduction, as they can kill wolves that eat their livestock and get reimbursement for their losses, while wild animals are protected by law. In fact, wolf reintroduction was pushed hard by the U.S. Government, primarily by the U.S. Fish and Wildlife Service, who oversees threatened and endangered species within the United States. This includes several studies looking into the feasibility of reintroducing the wolf in places farther east, in areas like Adirondack State Park in New York and certain areas of Maine.

Recent studies have shown that the wolf would have enjoyed greater protection had they been allowed to repopulate areas on their own, without human intervention. Reports by wildlife biologists working for the National Park Service who stated that they had seen, though rarely, wolves in Yellowstone National Park, and had photographic proof of their limited presence prior to the "reintroduction", were essentially suppressed by the U.S. Fish and Wildlife Service.

Where wolves are reintroduced after a long absence, it has a marked influence on the coyote population. As they started to fill in the niche of the top predator, they started to grow larger. With the return of the wolf, these bigger coyotes are hunted down by wolves and go back to their previous niche.

In Sweden, there is a long and ongoing conflict between some groups who claim that the wolf has no place in nature, and that it has been reintroduced by the Swedish government with some sort of secret agenda. The opponents are generally the rural working class who fear competition for Roe Deer and moose; they consider the wolf to be a foreign element, much like immigrants. In spite of the fact that attacks on people are virtually nonexistent historically, and hundreds of dogs are killed each year in hunting accidents, the wolves' possible threat to dogs and people is often cited by these people as a strong argument against the wolf's right to exist in Swedish forests.

In many ancient myths, the wolf was portrayed as brave, honorable, and intelligent. The best examples of these myths can be seen in those of the Native Americans. The wolf was also the revered totem animal of Ancient Rome (see Romulus and Remus and Lupercalia). In Proto-Indo-European society, the wolf was probably associated with the warrior class (see also werewolf), and the term was subject to taboo deformation, the Latin lupus being an example of a mutated form of the original Proto-Indo-European *wlkwos. Many Germanic personal names used to include "wolf" as an element (e.g. - Wulfstan).

In more modern western folklore, the wolf is a creature to be feared. The iconic examples of this image are the Big Bad Wolf and the werewolf— a human that transforms into a wolf through magic or a curse, one that is shunned and reviled in regular society. Norse mythology includes several malevolent wolves: the giant Fenrisulfr, eldest child of Loki, and the giantess Angrboda, who was feared and hated by the Æsir, and his children Skoll and Hati, who devour the sun and moon at Ragnarok.

Human fear of the wolf is responsible for most of the trouble the species has received, and the reason it was nearly hunted out of existence. However, in the 20th century, with the new knowledge of wolves and the growing respect for Native American folklore, the animal has been generally depicted much more positively.

Despite their often negative image, wolves have variously been credited, in mythology, fiction and reality, with adopting, nursing, and raising human feral children, the most famous examples being Romulus and Remus and Mowgli of The Jungle Book.

See also Wolf hunting and Wolf hunting controversy

Wolves are hunted for their pelt, recreation, and population control.

As long as there are enough prey animals, wolves seem to avoid taking livestock. However, some 'problem animals' can specialize in hunting livestock. Sheep are frequently the most vulnerable, while horses and cattle are at less of a risk. Wolf-secure fences and the relocation of wolves are today the only known methods to effectively stop livestock predation.

Over several centuries in some countries, shepherds and dog breeders have used selective breeding to 'create' large livestock guarding dogs that can stand up to wolves preying on flocks. In the United States, as the timber wolf has been reintroduced, the USDA has been looking into the use of breeds such as the Akbash from Turkey, the Maremma from Italy, the Great Pyrenees from France and the Kuvasz from Hungary, among others.

Some ranchers in the United States hunt wolves from helicopters or light planes, some of them calling it an effective method of controlling wolf numbers, others calling it a sport. This practice is seen as highly controversial.

Poisons have been used to kill wolves during the extermination campaigns in Europe and America. Today, most of the hunting is done on the ground or from helicopters.

Other, non- or less-lethal methods of protecting livestock from wolves have been under development for the past decade. Such methods include rubber and beanbag ammunition, radio activated guard boxes, fladry lines, and use of llamas as guard animals.

Wolves are frequently trapped, in the areas where it is legal, using snares or leg hold traps. The economic value of wolf pelts is limited, so it is mainly a recreation activity. Wolf trapping has come under heavy fire from animal rights groups and is used to attack other forms of trapping and hunting. It is alleged that trapping, using the right tools and equipment, can be considered as humane as hunting; however, unskilled trappers can create useless suffering in animals.

Wolves are bred for their fur in very few locations, as they are considered as a rather problematic animal to breed, and combined with the low value of the pelt, it has driven most of the fur farms to change to slaughtering other animals, such as the fox.

Much debate has occurred over the relationship between the wolf and the domestic dog. Most authorities see the wolf as the dog's direct ancestor, but others have postulated descent from the Golden Jackal. Because the canids have evolved recently and different canids interbreed fairly readily, untangling the true relationships has presented difficulties. However, molecular systematics now indicate very strongly that domestic dogs and wolves are more closely related than either is to any other canid, and the domestic dog is now normally classified as a subspecies of the wolf: Canis lupus familiaris.

The classification of wolves and closely allied creatures offers many challenges. Although taxonomists have proposed many species over the years, most types clearly do not comprise true species. Indeed, only a single wolf species may exist. Scientists have proposed a host of subspecies. Many of these seem unlikely to stand. Further taxonomic clarification may well take decades.

The subspecies for the Grey Wolf has been a very controversial issue among taxonomists. It was once believed there were as many as 50 separate subspecies. However, the last decade has seen a new and widely accepted list that has been condensed to 13 living subspecies, and 2 recently extinct subspecies. This takes into account the anatomy, distribution, and migration of various wolf colonies.

• Grey Wolf (Canis lupus)
  • Tundra Wolf (Canis lupus albus) - Northern Russia
  • Arabian Wolf (Canis lupus arabs) - Arabian Peninsular
  • Arctic Wolf (Canis lupus arctos) - Canadian Arctic islands and Greenland
  • Mexican Wolf (Canis lupus baileyi) - Reintroduced into Arizona
  • Russian Wolf (Canis lupus communis) - Central Russia
  • Caspian Sea Wolf (Canis lupus cubanensis) - Russia, between the Caspian Sea and the Black Sea
  • Hokkaido Wolf (Canis lupus hattai) - South Japan. Extinct
  • Honshu Wolf (Canis lupus hodophilax) - North Japan. Extinct
  • Italian Wolf (Canis lupus italicus) - Italian Apennines
  • Egyptian Wolf (Canis lupus lupaster) - North Egypt and North East Libya. Previously mistaken for golden jackals
  • Eurasian Wolf (Canis lupus lupus) - from China, Mongolia, Russia and Eastern Europe to Germany, Spain and Portugal
  • Eastern Timber Wolf (Canis lupus lycaon) - South East Canada and North East USA.
  • Great Plains Wolf (Canis lupus nubilus) - North West USA, far West, Central and Eastern Canada
  • Mackenzie Valley Wolf (Canis lupus occidentalis) - Western Canada and Alaska
  • Indian Wolf (Canis lupus pallipes) - From India to the Middle East

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• Maned Wolf
• Tasmanian wolf
• Werewolf
• Wiktionary:Wolf

Three other canid species also known as wolves:

• Red Wolf
• Ethiopian Wolf
• Dire Wolf

1. ^ "Wolves". What is a wolf? URL accessed on August 18, 2005.
2. ^ "The Animal Attraction". The Pact for Survival: How wolves became dogs. August 21. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
3. ^ "International Wolf Center". Wolf Basics. August 21. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
4. ^ "World of the Wolf". The skull of Canis lupus. August 21. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
5. ^ "Defenders of Wildlife". Gray Wolf. August 15. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
6. ^ "The Wild Habitat". Gray Wolf (Canis lupis). August 15. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
7. ^ "Eyes on Wildlife". Natural History of the Gray Wolf. August 21. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
8. ^ "Northern Prairie Wildlife Research Center". Wolf Pack Size and Food Acquisition. August 21. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
9. ^ "Wolf Web". Wolf Pack. August 21. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
10. ^ "Wolf Country". The Wolf Pack. August 20. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
11. ^ "Wolf Trust". Wolf Family Life. August 21. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
12. ^ "Wolfdancer Holding Company". Communication. August 21. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
13. ^ Fred H. Harrington. "NOVA Online." What's in a Howl? Accessed on August 21, 2005.
14. ^ "Smithsonian National Zoological Park". Gray Wolf Facts. August 15. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
15. ^ Template:Web reference author
16. ^ "Animal Diversity Web". Canis lupus. August 18. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)
17. ^ "Wolf Country". Wolf Facts. August 18. {{cite web}}: Check date values in: |date= and |year= / |date= mismatch (help)

• International Wolf Center
• Mission: Wolf
• Canids.org
• Wolf Park
• The Iberian Wolf