Snowy owls have very few natural predators. As one of the largest owl species, weighing up to 6 pounds with a wingspan stretching nearly 5 feet, they sit near the top of the Arctic food chain. The animals that do hunt them are mostly Arctic foxes and wolves, and even these predators typically only succeed when a snowy owl is vulnerable on or near its nest.
Foxes and Wolves: The Primary Threats
Arctic foxes are the most common natural predator of snowy owls, but they rarely take on a healthy adult in open flight. Instead, foxes target eggs and chicks in ground nests, or attempt to catch nesting adults that are reluctant to leave their young. Snowy owls nest directly on the tundra, scraping out shallow depressions on elevated ground, which makes their nests accessible to ground predators in a way that tree-nesting raptors avoid.
Wolves pose a similar threat. A wolf passing through nesting territory can destroy a clutch of eggs or kill chicks, though wolves don’t specifically seek out snowy owls as a food source. These encounters are opportunistic. Other large raptors, including golden eagles and eagle owls in parts of their range, can also kill snowy owls, though documented cases are uncommon.
How Snowy Owls Defend Themselves
Snowy owls are far from passive when predators approach. Males and females use dramatically different defense strategies, and together they form a surprisingly effective two-part system.
Males are the aggressive defenders. When a threat approaches the nest, the male typically flies straight at the intruder, swooping down silently from behind with fully extended wings in a long, shallow glide. These attacks target the highest point of the predator, striking from a blind spot. Between attacks, the male circles the intruder, calling repeatedly to maintain pressure. In field observations of 25 nesting pairs, 14 of 15 males attacked intruders directly.
Females take a different approach. Rather than attacking, most females use distraction displays. They land several hundred meters from the nest and begin walking or running toward the predator while flapping their wings, limping, and rocking side to side. They puff up their feathers to appear larger and make a distinctive mewing call. This display mimics an injured bird, drawing the predator’s attention away from the eggs or chicks. Of 25 observed females, 17 used this distraction strategy, while only one attacked directly.
Direct attacks deter predators faster and more effectively than distraction displays, which likely explains why the larger, more aggressive males take on that role. The combination of a male striking from behind while a female draws attention in a different direction creates a coordinated defense that makes raiding a snowy owl nest a difficult proposition for any fox.
Eggs and Chicks Face Greater Risk
While adult snowy owls are rarely killed by predators, their eggs and young are far more vulnerable. Jaegers (seabirds that scavenge and steal food across the tundra) will take unguarded eggs, as will ravens and gulls. Arctic foxes remain the biggest threat to nests, particularly during years when lemming populations crash and foxes are desperate for alternative food.
Snowy owl clutch sizes vary wildly depending on food availability, ranging from 3 to 11 eggs in a good year. In poor lemming years, pairs may not breed at all. This means that predation on even a few eggs during a low-productivity year can have an outsized impact on the population.
Human-Related Threats Kill More Than Predators Do
The biggest danger to snowy owls, particularly outside the Arctic, isn’t foxes or wolves. It’s people, though not through intentional hunting. A large-scale study combining necropsy results from 365 snowy owls and tracking data from 185 more over 20 years found that most deaths were not caused by starvation or natural predation. Instead, they were associated with human activity, especially vehicle collisions.
During winter irruption years, when food shortages push snowy owls south into southern Canada and the northern United States, they encounter hazards that don’t exist on the tundra. Vehicle strikes are the leading killer, since snowy owls hunt in open fields near roads and fly low to the ground. Electrocution from power lines, collisions with aircraft near airports (snowy owls are drawn to flat, open airfields that resemble tundra), and secondary poisoning from rodenticides all take a significant toll.
Despite these threats, satellite-tracked adult females showed annual survival rates between 85% and 92%, suggesting that adults who avoid human infrastructure have strong odds of surviving from year to year. The species’ vulnerability lies less in any single predator and more in the combination of Arctic nesting risks for young birds and human-caused mortality for adults that wander south.