“Arctic foxes change from white winter coats to brown or gray summer coats.”
The arctic fox is a small canid built for polar cold, with dense fur and seasonal coat colors. It hunts lemmings and birds on the tundra and scavenges seals killed by polar bears.
By An Nguyen · Published · Updated
Vulpes lagopus Carnivora Canidae
Measured against the 176 species profiled on this site. Each figure is converted to one unit system from the published range on the page, so the ranks are computed, not quoted.
| Measure | This species | Rank here | Exceeds |
|---|---|---|---|
| Body mass | 7.7 kg | #102 of 176#74 of 90 Mammalia | 41% |
| Body length | 68.6 cm | #114 of 176#74 of 90 Mammalia | 35% |
| Lifespan in the wild | 6 yr | #147 of 169#82 of 85 Mammalia | 10% |
Closest in body mass
Ranks use the upper end of each published adult range, so they compare typical large adults rather than records, and metrics with no published number are left out rather than estimated. The full table is downloadable from the species dataset, and any two species can be put side by side in the comparison tool.
Browse photographs of arctic fox across habitat, behavior, anatomy, and life stages.
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Core article
A closer look at habitat, diet, behavior, reproduction, and conservation.
The arctic fox (Vulpes lagopus) is a small carnivore of the far north and a member of the dog family Canidae. It ranges across polar tundra and sea-ice edges from Alaska and Canada to Greenland, Iceland, Scandinavia, and Siberia. A coat that changes colour with the season, a compact body that limits heat loss, and persistent scavenging let it live where almost no other land mammal can.
The arctic fox's fur is its master adaptation. A dense underlayer plus longer guard hairs trap warm air even at −50°C, and the coat changes twice a year: most foxes turn pure white in winter (a "blue" morph stays charcoal-grey), then moult to browns and greys in summer to match rock and lichen. The rest of the body follows the same heat-saving logic — short legs, small rounded ears, a blunt muzzle, and fur even on the paw pads all cut the surface area that leaks heat, while fat laid down under the skin serves as both insulation and fuel. Adults are small, about 18 to 27 inches in the body and 6 to 17 pounds, lighter than most red foxes. Once placed in its own genus, the arctic fox is now known from genetics to be a true fox (Vulpes), a cold-country cousin of the red fox and fennec fox — see arctic fox vs fennec fox for how the same genus solves opposite heat problems.
Arctic foxes circle the far north, using coastal plains, inland tundra, alpine-Arctic pockets, and the edges of the pack ice. They den in sandy or gravelly mounds that thaw earlier than the surrounding ground, and a good den — sometimes with dozens of entrances — may be reused by generations of foxes. In winter some follow polar bears out onto the sea ice to scavenge; in summer they stay nearer the den hunting lemmings and nesting birds. Warming is now shrinking summer ice and letting red foxes push north, squeezing arctic foxes at the southern edge of their range, especially in Scandinavia.
The arctic fox is an opportunist. Lemmings and other voles are the staple when their populations boom, with birds, eggs, fish, invertebrates, berries, and carrion filling the gaps when rodents crash. In winter it will trail polar bears or wolves to scavenge calorie-rich seal or reindeer remains. It hunts rodents by sound, pinpointing them under snow and pouncing through the drift, and caches surplus food near the den for lean times. That flexibility is survival itself — a fox tied to one prey would starve in the years when lemming numbers collapse.
Breeding pairs often stay together to raise pups, sometimes with a helper from the previous litter, while outside the denning season adults may range alone across large territories. They communicate with barks, growls, and scent marks around dens and trails. Facing danger, arctic foxes rely on camouflage and speed rather than a fight, and shelter in snow dens through storms. Where red foxes are expanding, the larger species can push arctic foxes out of the best ground.
Arctic foxes mate in early spring so pups arrive as the tundra warms. After about 52 days' gestation the female bears a large litter — commonly 5 to 10 pups, and more still in years when lemmings are abundant, one of the biggest litters of any wild canid. Both parents feed the young, which play and practise hunting near the den entrances through summer before dispersing in autumn. Wild lives are often just a few years, cut short by cold, food crashes, and predators; in captivity arctic foxes can live over a decade.
Globally the arctic fox is Least Concern, with a large circumpolar population, but the regional picture varies. The Fennoscandian population fell sharply from hunting, climate pressure, and red-fox competition and is still a conservation priority. Warming summers, disrupted sea ice, and mismatches in prey timing threaten parts of the range. Protecting intact tundra, limiting red-fox expansion where possible, and reducing conflict around camps all help keep this polar specialist widespread.
Arctic foxes change from white winter coats to brown or gray summer coats.
Their foot pads are covered in fur for grip and insulation on ice.
They sometimes follow polar bears to scavenge leftover seal meat.
Large dens with many entrances can be used by fox families for decades.
In good lemming years, litters can include more than a dozen pups.
Rounded ears and a short snout help keep body heat from escaping.
Select a question to reveal the answer.
They live in polar tundra and coastal Arctic habitats across North America, Greenland, Iceland, northern Europe, and Siberia, sometimes traveling onto sea ice.
Arctic foxes are opportunistic carnivores. They hunt lemmings, voles, birds, and eggs, and they scavenge carrion, including seals left by polar bears.
Their white winter fur camouflages them against snow. In summer many foxes molt into brown or gray coats that match tundra rocks and plants.
Arctic foxes are smaller, with shorter legs and ears for saving heat. Red foxes are larger and more adaptable to forests and farmland, and they can push arctic foxes out of overlapping areas.
Globally they are Least Concern, but some populations — especially in Scandinavia — face serious threats from climate change and competition with red foxes.
Thick layered fur, furry feet, a compact body shape, and fat stores help them survive temperatures far below freezing.
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