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The wolverine (Gulo gulo) is both a scavenger and a hunter: it often feeds on large-animal carcasses, but it also catches smaller prey. What it eats depends on where it lives, the season, and which foods are available. It can store surplus food in caches for later, a useful strategy when meals are irregular. Wolverines are wild, wide-ranging carnivores—not pets—and their ecology is shaped by cold, remote landscapes.
What do wolverines eat?
Wolverines eat a varied diet of animal food. Large ungulates—including moose, caribou, deer, and elk—can be important, usually as carcasses rather than animals killed by the wolverine. They also hunt smaller prey such as rodents, hares, and birds. The proportions differ across the animal’s range and change with season and local food availability.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThat combination is why it is misleading to label the wolverine only a scavenger or only a predator. A carcass can provide a substantial meal when one is available; at other times, a wolverine may forage for or catch smaller animals. Its diet is better understood as flexible than as a fixed menu.
The USDA Forest Service’s review of wolverine ecology summarizes 12 studies in which white-tailed deer, mule deer, and moose were primary foods in Idaho, Montana, and Wyoming. It describes different prey mixes in British Columbia and Alaska. Those findings illustrate regional variation; they do not mean that the same ungulates dominate diets everywhere.
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Large prey may also appear in reports of wolverine attacks, but that should not be confused with the usual explanation for large-ungulate meals. The available sources describe large ungulates chiefly as carrion in many North American settings. Wolverines can hunt successfully, but occasional attacks on larger animals do not establish that such prey is their normal source of food.
Are wolverines scavengers or hunters?
They are both. Scavenging is an important way wolverines obtain food, while hunting and other foraging let them take advantage of smaller prey and changing conditions. Calling them “resilient scavengers” captures part of their feeding strategy, but not all of it.
Carcasses may result from natural mortality, hunting, or kills made by other predators. Large carnivores such as wolves can therefore affect food availability for wolverines: a carcass left behind can become a meal for a scavenger. This link does not make wolverines dependent on one predator or one kind of carcass. Their menu shifts with the food present in a particular place and time.
Nor does scavenging mean an animal never has to find or secure food on its own. Wolverines also forage for small animals and may hunt them. The balance between scavenged and hunted food is not a single species-wide ratio established by the cited sources; it varies by location and conditions.
Do wolverines eat caribou?
Yes. Caribou can be an important food in places where they are available, often as carrion. One regional example comes from the COSEWIC assessment: among winter-trapped wolverines in Nunavut’s Kitikmeot Region, caribou remains were found in 62% of stomachs, and muskox remains in 11%.
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Those percentages describe that particular sample and winter-trapping context, not the proportion of all meals eaten by wolverines everywhere. They should not be generalized to other regions or seasons. The 2014 COSEWIC assessment is useful for that regional diet finding and life-history information, but it is not a current legal-status ruling.
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Winter food can include carrion and food the animal stored earlier. Wolverines may also forage or hunt; a cold season does not reduce their feeding strategy to waiting for one kind of carcass. What is available varies among landscapes, and the sources do not establish a single winter menu for the whole species.
Carcasses matter because large ungulates are important food in many North American settings. Their availability can depend on local prey populations, natural mortality, hunting, and the activity of other predators. Small prey and fresh prey may matter more in some summer contexts, while carrion and cached food can be particularly important in winter. These are broad patterns, not rules that apply identically to every wolverine.
For a specific regional perspective, the Alaska Department of Fish and Game’s wolverine profile summarizes diet and seasonal ecology in Alaska. A regional account can help explain local feeding without standing in for the species’ entire range.
Why do wolverines cache food?
Wolverines cache food by hiding excess food and returning to it later. Caches, which may be placed under snow or soil or in other protected spots, help turn a large or irregular meal into a reserve for a later period when food is harder to come by.
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Food storage is a strategy, not a guarantee. A wolverine cannot count on every cache remaining available and untouched, and caching does not mean it eats only carcasses. The animal still depends on finding food in the first place, and it can also hunt and forage. Colorado Parks and Wildlife describes caching and foraging in its wolverine overview.
The important point is the relationship between feeding and storage: when a wolverine can take advantage of surplus food, hiding some for later can help bridge periods when meals are less predictable. It is one part of a flexible diet, rather than a special dependence on a single food source.
Where do wolverines live, and what does habitat have to do with food?
Wolverines use a range of cold, remote environments, including forest, alpine, subalpine, and tundra landscapes. The balance of vegetation and terrain differs across their broad range, so no single forest type or landscape description defines habitat for every population. In parts of the contiguous United States, the Forest Service review associates them with extensive wilderness and coniferous forest as well as alpine and subalpine settings; Canadian sources also describe boreal forest and Arctic tundra.
Habitat matters to feeding because the prey and carcasses available to a wolverine depend on the surrounding landscape. A regional diet shaped by deer, moose, or caribou cannot simply be assumed for a place where those animals or other foods are not similarly available. A useful way to read diet reports is to ask where and when the observations were made before applying them more broadly.
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How do wolverines raise their young?
Females give birth and raise kits in dens. Dens may be under snow, rocks, or logs, and late-persisting snow can provide insulation. Alaska Department of Fish and Game reports that litters average two to three kits, born between February and April.
That timing is a seasonal window, not a promise that every litter arrives on the same date across the range. Den sites and local conditions vary, and the presence of persistent snow is relevant to some denning habitat without being a complete definition of where wolverines live. The COSEWIC assessment and Alaska agency profile provide complementary regional life-history details.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Are wolverines threatened?
The answer depends on geography and on which legal determination is being discussed. In November 2023, the U.S. Fish and Wildlife Service listed the North American wolverine distinct population segment in the contiguous United States as threatened under the Endangered Species Act. That federal decision applies to that geographically defined U.S. segment, not automatically to wolverines in Alaska, Canada, Eurasia, or the species worldwide.
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The USFWS final rule says the listing was based primarily on ongoing and increasing climate-change impacts and associated habitat degradation and fragmentation. The agency’s November 2023 announcement quotes Pacific Regional Director Hugh Morrison as saying, “Current and increasing impacts of and associated habitat degradation and fragmentation are imperiling the North American wolverine.”
This is a dated legal action, not a blanket statement about global status. The cited rule establishes the November 2023 determination; readers making a current legal or management decision should consult USFWS for any subsequent rulemaking. The older Forest Service and COSEWIC materials are useful ecological sources, but they should not be substituted for a current U.S. legal determination.
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What should readers remember about wolverines?
A wolverine is an adaptable wild carnivore that scavenges large-animal carcasses, hunts smaller prey, and stores some food when it can. Its menu changes with region, season, and availability, so a statistic or prey list from one place should not be mistaken for a universal diet. Its life cycle is associated with remote cold landscapes, but habitat includes more than snow alone; and conservation claims need to specify the population and jurisdiction involved.
For readers encountering wolverines through a pet-focused lens, the central distinction is simple: this is a wild animal whose behavior and needs are described in ecological and wildlife-management sources, not a domestic companion animal. Understanding its feeding means understanding its place in natural food webs and the changing conditions of the landscapes it inhabits.
Frequently Asked Questions
What did the Nunavut wolverine stomach study find?
In winter-trapped wolverines from the Kitikmeot Region, COSEWIC reported caribou remains in 62% of stomachs and muskox remains in 11%. These are sample-specific findings, not a range-wide estimate of what wolverines eat.
Can a wolverine survive on stored food alone?
The cited sources describe caches as a way to retain surplus food for later, not as a guaranteed or exclusive food supply. Wolverines also scavenge, hunt, and forage, and a cache may not remain available.
Does a late-snow den mean wolverines only live in snowy places?
No. Persistent snow can insulate some dens, but wolverines use varied forest, alpine, subalpine, and tundra environments. Denning conditions are only one part of habitat.
What is a wolverine distinct population segment?
It is a geographically defined population unit used in the U.S. federal listing decision. The 2023 threatened listing discussed here concerns the contiguous-U.S. North American segment, rather than every wolverine worldwide.
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