Wolf
In 1758, the Swedish botanist Carl Linnaeus published Systema Naturae and listed the wolf as Canis lupus. He classified the domestic dog as a separate species called Canis familiaris due to its upturning tail. Modern genomic studies reveal that wolves and dogs are sister taxa sharing a common ancestral population. A 2021 study found the Himalayan wolf split from other lineages 200,000 years ago. Remains from Cripple Creek Sump in Alaska may be around one million years old. The oldest fossils of the modern grey wolf date to 406,500 years ago at Ponte Galeria in Italy. Late Pleistocene wolves possessed more robust skulls and teeth than their modern counterparts. These features suggest adaptations for processing carcasses and bones associated with hunting megafauna. Some ancient wolves showed tooth breakage similar to the extinct dire wolf. They likely competed with other carnivores and needed to consume prey quickly. Genomic data indicates Old World and New World wolves split approximately 12,500 years ago. The lineage leading to dogs diverged from other Old World wolves between 11,100 and 12,300 years ago.
A North American wolf measures roughly 1.3 meters in length and stands about 80 centimeters at the shoulder. Adult males typically weigh between 40 and 79 kilograms while females are smaller. Wolves possess a broad snout, shorter ears, and a longer tail compared to coyotes or jackals. Their legs are moderately longer than those of other canids allowing swift movement through deep snow. Winter fur is dense and fluffy with a short undercoat and long guard hairs. Wolves in northern climates rest comfortably at minus 40 degrees Celsius by placing muzzles between rear legs. Fur provides better insulation than dog fur and does not collect ice when warm breath condenses against it. Blood flow near the skin reduces to conserve body heat during extreme cold. Foot pads maintain temperature just above tissue-freezing point where they contact ice. Coat colors vary from white in the Canadian Arctic to grey across southern Canada and the United States. Black-colored wolves acquired their color from wolf-dog admixture after dogs arrived across the Bering Strait 12,000 to 14,000 years ago. The skull measures approximately 30 centimeters in length and 15 centimeters in width.
Wolves feed predominantly on ungulates that match the combined mass of pack members. A pack of 15 can bring down an adult moose. In North America diet is dominated by elk moose caribou white-tailed deer and mule deer. Wolves across Eurasia prey mostly on moose red deer roe deer and wild boar. Single wolves or mated pairs often have higher success rates than large packs. They may wound large prey then lie around resting for hours before killing it when blood loss weakens the animal. With medium-sized prey like roe deer they kill by biting the throat severing nerve tracks and the carotid artery. Small mouselike prey are immobilized with forepaws after a high arc leap. Once prey is brought down wolves gorge on internal organs like heart liver lungs and stomach lining. A wolf can eat 15 to 19 percent of its body weight in one sitting. Breeding pairs monopolize food to continue producing pups especially during scarcity. Wolves move around their territory using trails for extended periods hunting nocturnally. During winter a pack commences hunting at twilight and hunts all night traveling tens of kilometers.
The global wild wolf population was estimated at 300,000 in 2003. The International Union for Conservation of Nature classifies the species as Least Concern due to its widespread range. Wolf populations declined until the 1970s but have since rebounded through legal protection and land use changes. Canada hosts 50,000 to 60,000 wolves occupying 80 percent of their historical range. Alaska contains 7,000 to 11,000 wolves across 85 percent of the state area. In the contiguous United States over 4,000 wolves reside in Great Lakes states as of 2018. Reintroduced Mexican wolf numbers exceeded 250 individuals by 2024. European Union countries hold 20,300 wolves with breeding packs in 23 nations. Wolves were exterminated in Great Britain by 1684 and in Ireland by 1770. Russia maintains up to 45,000 wolves despite government bounties and annual harvests of 20 to 30 percent. Israel has protected its wolves since 1954 maintaining a population of 150. Mongolia holds between 10,000 and 20,000 wolves while China protects roughly 16,650 across Heilongjiang Xinjiang and Tibet.
Ancient Greeks associated wolves with Apollo the god of light and order. The Ancient Romans believed founders Romulus and Remus were suckled by a she-wolf. Norse mythology includes Fenrir the giant wolf and Geri and Freki Odin's faithful pets. Chinese astronomy links the wolf to Sirius guarding the heavenly gate. Aesop featured wolves in fables warning against false alarms and distrust. Charles Perrault wrote Little Red Riding Hood in 1697 contributing to negative Western perceptions. Isengrim the wolf appears in the 12th-century Latin poem Ysengrimus as a victim of Reynard the fox. Farley Mowat published Never Cry Wolf in 1963 which changed popular views by portraying wolves as noble family members. Rudyard Kipling included wolves as central characters in The Jungle Book showing them living in amiable groups. Leo Tolstoy and Anton Chekhov included scenes of wolf hunting in their works like War and Peace and Peasants. The Bible uses an image of a wolf lying with a lamb in a utopian vision of the future.
Livestock depredation remains a primary reason for hunting wolves causing economic losses and stress for producers. In Eurasia large parts of some wolf diets consist of livestock while such incidents are rare in North America. Most attacks on cattle result in one death but turkeys sheep and reindeer may be killed in surplus. Wolves kill dogs occasionally and in Croatia kill more dogs than sheep. Rabid wolves act alone traveling large distances biting many people and domestic animals. Bites from rabid wolves are 15 times more dangerous than those of rabid dogs. During fifty years up to 2002 there were eight fatal attacks in Europe and Russia and over two hundred in southern Asia. Predatory attacks typically occur locally and stop only when involved wolves are eliminated. Children under age 18 make up the majority of predatory attack victims. Indian wolves have a history of preying on children known as child-lifting. Theodore Roosevelt noted wolves are difficult to hunt due to elusiveness and sharp senses. Historic methods included killing spring-born litters coursing with dogs and poisoning with strychnine. Shooting wolves from aircraft is highly effective due to increased visibility and direct lines of fire.
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Common questions
When did Carl Linnaeus publish Systema Naturae and list the wolf as Canis lupus?
Carl Linnaeus published Systema Naturae in 1758 and listed the wolf as Canis lupus. He classified the domestic dog as a separate species called Canis familiaris due to its upturning tail.
How old are the oldest fossils of the modern grey wolf found at Ponte Galeria in Italy?
The oldest fossils of the modern grey wolf date to 406,500 years ago at Ponte Galeria in Italy. Remains from Cripple Creek Sump in Alaska may be around one million years old.
What is the average pack size for wolves in North America compared to European packs?
Average pack size in North America contains eight wolves while European packs average 5.5 individuals. Exceptionally large packs may contain up to 42 wolves.
How many wolves were estimated globally in 2003 and what is their current conservation status?
The global wild wolf population was estimated at 300,000 in 2003. The International Union for Conservation of Nature classifies the species as Least Concern due to its widespread range.
When did wolves become extinct in Great Britain and Ireland respectively?
Wolves were exterminated in Great Britain by 1684 and in Ireland by 1770. These dates mark the end of native populations in those regions before modern reintroduction efforts.