Gray Wolf (Canis lupus): Facts, Packs, Habitat and Diet

What does a gray wolf look like?

A gray wolf looks like a large, long-legged German shepherd with a broad head, a long, blunt muzzle, fairly short rounded ears and a bushy tail. Its chest is deep and narrow, and its big feet act a little like snowshoes, helping it travel through deep snow.

Despite the name, gray wolves are not always gray. Most have a mottled mix of gray, buff, brown, black and white hairs, with paler legs and underparts. Wolves of the Canadian Arctic and Greenland are often almost pure white, while black wolves are common in some North American populations, including Yellowstone National Park. Genetic studies show that the black coat comes from a gene variant that wolves picked up from domestic dogs thousands of years ago.

The winter coat has a dense, woolly underfur beneath long guard hairs. It insulates so well that northern wolves can rest in the open at −40 °C (−40 °F), curled up with the tail over the face. Much of the underfur is shed in spring, which is why wolves look leaner and leggier in summer.

How big are gray wolves?

Wolves follow a pattern biologists call Bergmann’s rule: the farther north they live, the bigger they tend to be. Wolves of Alaska, Canada and Russia are the heaviest, while wolves of India and the Arabian Peninsula average only about 25 kg (55 lb). Females are usually a little smaller and lighter than males.

Wolves heavier than about 54 kg (119 lb) are uncommon, and stories of much bigger wild wolves are usually unverified.

Subspecies and close relatives

More than 30 subspecies of gray wolf have been described, although experts disagree about how many are truly distinct. Well-known forms include the Eurasian wolf of Europe and northern Asia, the white Arctic wolf of the High Arctic, the small Mexican wolf of the US Southwest and Mexico, and the Indian wolf. Some taxonomists also classify the domestic dog and the dingo as forms of Canis lupus, because dogs descend from ancient wolves.

Wolves are closely related to the coyote and the golden jackal and can produce fertile hybrids with both, as well as with dogs. The status of the eastern wolf of Ontario and the red wolf of the southeastern United States is still debated: some scientists treat them as separate species, others as old mixtures of wolf and coyote. To tell a wolf from its smaller cousin, see wolf vs coyote.

Habitat and range

Gray wolves once had one of the largest natural ranges of any land mammal, covering most of North America, Europe and Asia. They are habitat generalists that live in forests, Arctic tundra, prairies and steppes, mountains, semi-deserts and even farmland, as long as there is enough prey and they are not heavily persecuted.

Today the largest populations live in Canada (roughly 52,000–60,000 wolves), Alaska (about 7,000–11,000), Russia, Kazakhstan, Mongolia and other parts of Asia. In the contiguous United States, wolves live mainly in Minnesota, Wisconsin and Michigan, the northern Rocky Mountains and the Pacific Northwest, with a small reintroduced population of Mexican wolves in Arizona and New Mexico. Colorado began releasing wolves in December 2023 after voters approved a ballot measure in 2020.

Europe’s wolves are recovering quickly. The European Union now holds more than 20,000 wolves, with strongholds in the Balkans, the Carpathian Mountains, Italy, the Iberian Peninsula, Poland and the Baltic states. Wolves have spread back on their own into Germany, where the first wild litter in well over a century was born in 2000, as well as France, the Netherlands, Belgium and Denmark.

What do gray wolves eat?

Gray wolves are carnivores that specialize in large hoofed mammals (ungulates). In North America their main prey are elk, moose, caribou, white-tailed deer and mule deer, plus bison in a few areas. In Europe and Asia they take mostly red deer, roe deer, moose and wild boar. Wolves also eat beavers, hares, rodents and birds, scavenge carcasses and, where wild prey is scarce, can depend heavily on sheep, goats and other livestock. In summer they even eat some berries and fruit.

Wolves hunt mainly by testing herds and chasing down the young, old, sick or weak. Most chases fail, and big prey fights back: wolves are regularly injured or killed by the hooves of moose, elk and bison. A pack travels an average of about 25 km (16 mi) a day in search of food, usually at a steady trot of about 8 km/h (5 mph), and can sprint at roughly 50–60 km/h (31–37 mph) for short distances.

Feast or famine is normal. A wolf can eat up to about 9 kg (20 lb) of meat at one sitting and then go several days without a meal. Leftovers feed ravens, eagles, red foxes and bears, one reason wolves matter to whole ecosystems.

Pack life, territory and howling

A wolf pack is a family: usually a breeding pair and their offspring from the past one to three years. Packs commonly have five to nine wolves, but some grow much larger, and packs of more than 30 have been recorded in Yellowstone National Park. Young wolves usually leave between one and three years of age to find a mate and a territory of their own, sometimes traveling hundreds of kilometers. A radio-collared wolf known as OR-7 left northeastern Oregon in 2011, wandered more than 1,600 km (1,000 mi) and became the first wild wolf confirmed in California since 1924.

The old idea of a ruthless “alpha” fighting its way to the top came largely from studies of unrelated wolves kept together in captivity. In 1999, wolf biologist L. David Mech pointed out that in wild packs the leaders are simply the parents, and most researchers now call them the breeding pair.

Packs defend territories that range from about 33 km² (13 sq mi) where prey is plentiful to more than 6,000 km² (2,300 sq mi) in parts of Alaska. They mark boundaries with urine, droppings and scratch marks, and fights with neighboring packs are a major cause of death in protected areas.

How wolves communicate

Wolves talk to each other with howls, barks, growls and whines, with body language such as tail position, ear posture and raised hackles, and with scent. Howling keeps scattered pack members in touch, rallies the pack and tells rival packs that a territory is taken. Under good conditions a howl can be heard up to about 16 km (10 mi) away on open tundra. Despite the classic image, wolves do not howl at the moon; read more in why do wolves howl?

Reproduction and life cycle

Wolves breed once a year, between January and April, with northern wolves mating later than southern ones. After a pregnancy of about 63 days, the female gives birth in a den, often a burrow dug into a bank, a rock crevice or an enlarged fox or badger hole. Litters usually have four to seven pups, and up to 14 have been recorded.

Pups weigh about 300–500 g (11–18 oz) at birth and are born blind and deaf. Their eyes open at about two weeks, and they first wander out of the den at around three weeks old. The whole family helps raise them, carrying meat back in their stomachs and bringing it up for the pups to eat. By autumn the young wolves follow the adults on hunts, and they are close to adult size at about a year old. Wolves can breed at about two years of age, but in most packs only the parents do so.

Lifespan, predators and threats

Wild wolves live on average about five to six years, although a few reach 13 years or more; in captivity they can live 15 years or longer. Adults have few natural enemies apart from other wolves, though Siberian tigers in the Russian Far East and bears sometimes kill wolves or their pups. The main causes of death are people (legal killing, poaching and traffic), fights with other packs, diseases such as mange, distemper and parvovirus, starvation and injuries from prey. Find out more in how long do wolves live?

Conservation status

The IUCN Red List classifies the gray wolf as Least Concern because of its huge range and large overall population. That global picture hides a long history of persecution. Bounties, poison and organized extermination campaigns wiped wolves out of Britain, Ireland, Japan, most of Western and Central Europe and almost all of the contiguous United States by the mid-20th century.

Legal protection changed the trend. In the United States, wolves were protected under the Endangered Species Act from the 1970s; numbers in Minnesota recovered, and in 1995 and 1996 wolves from Canada were released into Yellowstone National Park and central Idaho. In Europe, protection under the Bern Convention and the EU Habitats Directive, together with growing deer populations and fewer people living in the countryside, allowed wolves to spread back naturally.

As numbers rose, rules were loosened. In 2025 the wolf’s status under both the Bern Convention and the Habitats Directive was lowered from “strictly protected” to “protected”, giving countries more room to manage wolves. In the US, the federal protection of wolves has changed repeatedly through new rules and court rulings. The Mexican wolf remains one of the rarest wolves in the world, with only a few hundred living in the wild.

Wolves and people

The bond between people and wolves is ancient. Dogs were domesticated from wolves at least 15,000 years ago, and wolves appear in myths from Rome’s founding legend of Romulus and Remus, raised by a she-wolf, to the giant wolf Fenrir of Norse mythology. Fairy tales such as “Little Red Riding Hood” helped create the image of the big bad wolf.

The real conflicts are mostly about livestock. Wolves kill sheep, goats, cattle, domestic reindeer and sometimes dogs, especially where animals graze unattended. Livestock guardian dogs, night enclosures, electric fencing, shepherds and compensation programs reduce losses in many countries. Attacks on people are very rare; see are wolves dangerous? for the evidence.

Wolves also bring benefits. In Yellowstone, wolf watching draws visitors from around the world, and scientists study how wolves affect elk, coyotes, scavengers and plants. The popular claim that wolves on their own restored the park’s streams and willows is debated: research shows real effects, but how large they are is still argued.

Myths and facts

• Myth: wolves howl at the moon. Fact: wolves howl to communicate with each other, and the phases of the moon have no known effect on howling.
• Myth: packs are ruled by a fighting alpha. Fact: a wild pack is a family led by the parents.
• Myth: a lone wolf is an outcast. Fact: most lone wolves are young adults looking for a mate and an empty territory.
• Myth: wolves kill for fun. Fact: wolves sometimes kill more animals than they can eat at once, mostly penned sheep or deer stuck in deep snow, but they usually come back to feed on the carcasses when they can.