Arctic foxes rely on razor-sharp hearing, a signature high-pounce technique, and seasonal flexibility to catch prey across some of the harshest terrain on Earth. In winter, they hunt almost entirely by sound, leaping into deep snow to snatch rodents they cannot see. In summer, they shift to raiding bird nests and caching food for the lean months ahead.
Hunting by Sound Under Snow
For much of the year, an arctic fox’s prey is invisible, buried beneath layers of snow. Lemmings and voles tunnel through the subnivean zone, the network of air pockets between the ground and the snowpack, where they stay insulated from surface temperatures. The fox finds them almost entirely by ear.
Arctic foxes have a functional hearing range of 125 Hz to 16 kHz, with peak sensitivity around 4 kHz. That peak matters because it sits right in the frequency range of small rodents rustling, scratching, and squeaking beneath the snow. When hunting, a fox will walk slowly across the snowfield, tilting and rotating its head to triangulate the faint sounds of movement below. Once it locks onto a target, it freezes, sometimes for several seconds, making micro-adjustments with its ears before committing to a strike.
The Signature Snow Pounce
The pounce itself is one of the most recognizable hunting moves in the animal kingdom. The fox launches itself upward, reaching roughly 50 to 60 centimeters above the snow surface, then drives headfirst into the snowpack at a steep angle. The goal is to pin the rodent with its forepaws or snout before the animal can escape through its tunnel network. If the prey is deeper, the fox uses its forelimbs to push its head and upper body further below the surface.
This isn’t a casual leap. The steep dive angle lets the fox concentrate its body weight into a narrow point of entry, punching through compacted snow that a flat landing would barely dent. Research on fox skull morphology published in the Proceedings of the National Academy of Sciences found that the shape of a fox’s skull and snout plays an active role in how efficiently it penetrates the snowpack, functioning almost like a wedge.
Magnetic Alignment and Accuracy
There’s a striking detail about directional alignment that likely applies to arctic foxes as well as their close relatives. Czech scientists studying red foxes discovered that when foxes align their pounces toward the northeast, roughly in line with Earth’s magnetic north, they catch prey 73% of the time. Jumps in other directions succeed only about 18% of the time. Researchers believe the foxes use the Earth’s magnetic field as a kind of rangefinder, helping them gauge the distance to prey they can hear but not see. This was the first documented case of a predator using magnetoreception to improve hunting success. While the study focused on red foxes, both species share the same pouncing technique and overlapping habitats in parts of the Arctic, making it plausible that arctic foxes use a similar system.
Summer Hunting: Bird Colonies and Egg Raids
When the snow melts, arctic foxes pivot to a completely different food source. They become major predators of ground-nesting birds, particularly arctic geese. During the nesting season, foxes patrol goose colonies systematically, targeting eggs and goslings. They are, by a wide margin, the most significant predator of many arctic-nesting bird species, and in some years their raids substantially reduce nesting success across entire colonies.
What makes this strategy especially effective is not just the raiding itself but what the foxes do with the surplus. Arctic foxes cache up to 90% of the goose eggs they collect, burying them in shallow holes across the tundra. They also cache around 30% of the goslings and lemmings they catch. These hidden stores become critical fuel for winter, when live prey is scarce and hunting success drops. A single fox may maintain dozens or even hundreds of cache sites scattered across its territory.
Relocating Cached Food
Caching isn’t a one-and-done behavior. Arctic foxes actively manage their food stores, returning to retrieve and re-bury items in new locations. About 60% of cached goose eggs get “recached” at least once, moved from the original burial site to a different spot. This likely serves multiple purposes: it reduces the chance of other foxes or scavengers finding the stash, and it may help the fox keep better mental track of what it has and where.
Research using accelerometers attached to wild foxes found that recoveries for eating or recaching were most common in areas where goose nest density had been highest during the incubation period. In other words, foxes remember where the richest pickings were and return to those zones to manage their caches. This kind of spatial memory is essential in a landscape where a buried egg from July might be the difference between surviving or starving in January.
Scavenging From Polar Bear Kills
Arctic foxes don’t always catch their own food. In coastal and sea ice environments, they rely heavily on a commensal relationship with polar bears. Polar bears hunt seals, primarily ringed seals, but they eat mainly the blubber and leave substantial carcass remains behind. Arctic foxes follow polar bears across the ice, sometimes trailing them for long distances, waiting to pick over what’s left.
A 2024 study in western Hudson Bay found that arctic fox activity hotspots overlapped 49% with polar bear hotspots and 35% with seal-kill hotspots. That overlap isn’t coincidental. Foxes position themselves where bears are most actively hunting, essentially using polar bears as a food delivery system. Larger seal species like bearded seals are too big for foxes to hunt themselves, but a polar bear kill makes that calorie-rich meat accessible. This scavenging strategy is especially important during spring and early summer, when bears are in their peak hunting season and seal carcasses are most abundant on the ice.
Why the Seasonal Shift Matters
The arctic fox’s hunting repertoire is unusually broad for a small predator. In winter, it’s an acoustic specialist, pinpointing prey by sound and executing precision dives into snow. In summer, it’s an opportunistic raider, exploiting the brief explosion of bird nesting to stockpile food. Year-round, it supplements active hunting with scavenging. Each of these strategies depends on different skills: acute hearing for the snow pounce, spatial memory for cache management, and the behavioral flexibility to shadow a predator ten times its size across sea ice.
This versatility is what allows a 3-to-5 kilogram animal to survive in an environment where temperatures drop below minus 50 degrees Celsius and food availability swings wildly from season to season. The arctic fox doesn’t specialize. It does everything, and it does each thing well enough to outlast one of the most extreme climates on the planet.