What is the scientific name for the Wolf?

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Since November 16, 2012

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Background: Gray wolves (Canis lupus) were reintroduced into Yellowstone National Park (YNP) after a .70 year absence, and as part of recovery efforts, the population has been closely monitored. In 1999 and 2005, pup survival was significantly reduced, suggestive of disease outbreaks.

Methodology/Principal Findings: We analyzed sympatric wolf, coyote (Canis latrans), and red fox (Vulpes vulpes) serologic data from YNP, spanning 1991–2007, to identify long-term patterns of pathogen exposure, identify associated risk factors, and examine evidence for disease-induced mortality among wolves for which there were survival data. We found high, constant exposure to canine parvovirus (wolf seroprevalence: 100%; coyote: 94%), canine adenovirus-1 (wolf pups [0.5–0.9 yr]: 91%, adults [≥1 yr]: 96%; coyote juveniles [0.5–1.5 yrs]: 18%, adults [≥1.6 yrs]: 83%), and canine herpesvirus (wolf: 87%; coyote juveniles: 23%, young adults [1.6–4.9 yrs]: 51%, old adults [≥5 yrs]: 87%) suggesting that these pathogens were enzootic within YNP wolves and coyotes. An average of 50% of wolves exhibited exposure to the protozoan parasite, Neospora caninum, although individuals’ odds of exposure tended to increase with age and was temporally variable. Wolf, coyote, and fox exposure to canine distemper virus (CDV) was temporally variable, with evidence for distinct multi-host outbreaks in 1999 and 2005, and perhaps a smaller, isolated outbreak among wolves in the interior of YNP in 2002. The years of high wolf-pup mortality in 1999 and 2005 in the northern region of the park were correlated with peaks in CDV seroprevalence, suggesting that CDV contributed to the observed mortality.

Conclusions/Significance: Of the pathogens we examined, none appear to jeopardize the long-term population of canids in YNP. However, CDV appears capable of causing short-term population declines. Additional information on how and where CDV is maintained and the frequency with which future epizootics might be expected might be useful for future management of the Northern Rocky Mountain wolf population.

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Nutritional, behavioral, and diet data for lesser scaup (Aythya affinis [Eyton, 1838]) indicates that there has been a decrease in amphipod (Gammarus lacustris [G. O. Sars, 1863] and Hyalella azteca [Saussure, 1858]) density and wetland quality throughout the upper-Midwest, USA. Accordingly, we estimated densities of Gammarus and Hyalella in six eco-physiographic regions of Iowa, Minnesota, and North Dakota; 356 randomly selected semi-permanent and permanent wetlands were sampled during springs 2004 and 2005. We also examined indices of wetland quality (e.g., turbidity, fish communities, aquatic vegetation) among regions in a random subset of these wetlands (n = 267). Gammarus and Hyalella were present in 19% and 54% of wetlands sampled, respectively. Gammarus and Hyalella densities in North Dakota were higher than those in Iowa and Minnesota. Although historical data are limited, our regional mean (1 to 12 m-3 ) amphipod densities (Gammarus + Hyalella) were markedly lower than any of the historical density estimates. Fish, important predators of amphipods, occurred in 31%–45% of wetlands in North Dakota, 84% of wetlands in the Red River Valley, and 74%–84% of wetlands in Iowa and Minnesota. Turbidity in wetlands of Minnesota Morainal (4.0 NTU geometric mean) and Red River Valley (6.1 NTU) regions appeared low relative to that of the rest of the upper- Midwest (13.2–17.5 NTU). We conclude that observed estimates of amphipods, fish, and turbidity are consistent with low wetland quality, which has resulted in lower food availability for various wildlife species, especially lesser scaup, which use these wetlands in the upper-Midwest.

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The gray wolf (Canis lupus) is the largest member of the Canidae (dog) family, with a range extending through Alaska and parts of Michigan, Wisconsin, Montana, Idaho, Oregon, and Wyoming. Gray wolves share their ancestry with domestic dogs, coyotes, and wild dogs such as dingoes. Scientists consider the gray wolf to be the species from which most other wolf subspecies evolved. The gray wolf is classified as part of the kingdom Animalia, order Carnivora, family Canidae, and the subfamily Caninae.

• Scientific Name: Canis lupus
• Common Name(s): Gray wolf, timber wolf, wolf
• Basic Animal Group: Mammal  
• Size: 36 to 63 inches; tail: 13 to 20 inches
• Weight: 40–175 pounds
• Lifespan: 8–13 years
• Diet: Carnivore
• Habitat: Alaska, northern Michigan, northern Wisconsin, western Montana, northern Idaho, northeast Oregon, and the Yellowstone area of Wyoming
• Population: 17,000 in the United States
• Conservation Status: Least Concern

Gray wolves look very much like large German shepherd dogs, with pointed ears and long, bushy, black-tipped tails. Wolf coat colors vary from white to gray to brown to black; most have a mix of colors with tan facial markings and undersides. Northern wolves are often larger than southern wolves, and males are usually larger than females.

Gray wolves were once found in large numbers throughout the Northern Hemisphere—in Europe, Asia, and North America. At one time or another, gray wolves have ranged across nearly every type of environment found north of the equator from deserts to tundra, but they were hunted to near extinction wherever they were found. In the ecosystems they inhabit, wolves are a keystone species: They have a large influence on their environment despite their low abundance. Gray wolves exert control on their prey species, changing the numbers and behavior of large herbivores like deer (which is now overabundant in many places), thus ultimately affecting even the vegetation. Because of that important role, wolves hold a central place in rewilding projects.

The gray wolf is an extremely adaptable species and is one of those animal species that survived the last ice age. The gray wolf's physical characteristics enabled it to adapt quickly to the harsh conditions of the ice age, and its cunning and adaptation helped it survive in the changing environment.

Gray wolves typically prey on large ungulates (mammals with hooves) such as deer, elk, moose, and caribou. Gray wolves also eat smaller mammals such as hares and beavers as well as fish, birds, lizards, snakes, and fruit. Wolves are also scavengers and will eat the flesh of animals killed by other predators, by motor vehicles, and so on.

When wolves find ample food or hunt successfully, they eat their fill. A single wolf may consume as much as 20 pounds of meat in a single feeding.

Gray wolves are social animals. They usually live and hunt in packs of six to 10 members and often range over long distances—up to 12 miles or more—in a single day. Typically, several members of a wolf pack will hunt together, cooperating to pursue and bring down large prey.

Wolf packs follow a strict hierarchy with a dominant male and female at the top. The Alpha male and female are usually the only two wolves in the pack that breed. All of the adult wolves in the pack help to care for the pups by bringing them food, instructing them, and keeping them from harm.

Gray wolves have a complex system of communication that includes a wide range of barks, whines, growls, and howls. Their iconic and legendary howl is one way that gray wolves communicate with each other. A lone wolf may howl to attract the attention of his pack while wolves in the same pack may howl together to establish their territory and declare it to other wolf packs. Howling may also be confrontational or may simply be an answering call to the howls of other wolves nearby.

Most wolves mate for life, breeding once a year between January and March (or earlier in the south). The gestation period is about 63 days; wolves usually give birth to between four and six pups.

Wolf mothers give birth in a den (typically a burrow or cave), where they can oversee the welfare of tiny pups which are born blind and weigh only about one pound. She will move the pups several times during the first few months of their lives. To feed their young, wolves regurgitate their food until the pups are old enough to manage meat on their own.

Young wolves stay with their natal pack until they are about three years old. At that point, they make the decision to either stay with their pack or strike out on their own.

Gray wolves have a conservation status of Least Concern, meaning that there is a large and stable population. Wolves were successfully reintroduced to Yellowstone National Park and parts of Idaho in 1995. They have been naturally recolonizing parts of their former range, moving into Washington and Oregon. In 2011, a lone male wolf made it to California. There is now a resident pack there. In the Great Lakes region, gray wolves are now thriving in Minnesota, Michigan, and now Wisconsin. One of the challenges of expanding gray wolf populations is that people continue to fear wolves, many farmers and ranchers consider gray wolves a menace to livestock, and hunters want the government to declare open season on gray wolves to stop them preying on game animals such as deer, moose, and elk.

By the mid-1930s, most gray wolves in the United States had been killed. Today, the gray wolf's North American range has been reduced to Canada and parts of Alaska, Idaho, Michigan, Minnesota, Montana, Oregon, Utah, Washington, Wisconsin, and Wyoming. Mexican wolves, a gray wolf subspecies, are found in New Mexico and Arizona.

Wolves and human beings have a long adversarial history. Although wolves rarely attack humans, both wolves and humans are predators at the top of the food chain. As a result, they are often in conflict as habitats decline and wolves become more likely to attack livestock.

Negative feelings toward wolves have been nurtured over the centuries through popular culture. Fairy tales such as "Little Red Riding Hood" represent wolves as vicious predators; these negative representations make it very difficult to present wolves as a species to be protected.

Despite negative interactions, wolves are also seen as symbols of strength and icons of the wilderness. This may be one reason why there is an increased interest in keeping wolves or wolf/dog hybrids as pets—a practice which is rarely successful for the animal or its owner.