Owls are strict carnivores. Every owl species lives entirely on animal prey — most commonly small mammals like voles, mice, shrews, and rats, along with birds, insects, frogs, reptiles, earthworms, and even fish. What a particular owl eats depends mostly on its size: a tiny screech-owl fills up on moths and beetles, a barn owl may swallow a thousand rodents in a year, and a great horned owl can carry off rabbits, ducks, and skunks. No owl eats seeds, fruit, or plants of any kind — an owl at your bird feeder is there for the mice underneath it, not the sunflower seed.
That short answer hides a remarkable range. With around 250 owl species worldwide occupying every habitat from Arctic tundra to tropical rainforest, owls have evolved into one of nature’s most versatile groups of nighttime hunters. This guide breaks down what owls eat species by species, how they catch it, and how scientists know an owl’s menu in astonishing detail — right down to the individual mouse.
Built to Hunt: How Owls Catch Their Food
An owl’s whole body is hunting equipment. The leading edge of each flight feather carries a comb-like fringe that breaks up turbulence, and a velvety surface muffles the rest — so an owl approaches in near-total silence while its prey keeps making noise. The famous facial disc works like a satellite dish, funneling faint sounds to ears that, in many species, sit asymmetrically on the skull: one ear slightly higher than the other. That offset lets an owl fix a sound in both the horizontal and vertical planes at once, which is why a barn owl can strike a mouse in absolute darkness, and a great gray owl can punch through a foot of snow onto a vole it never saw.
The final act belongs to the feet. Owls kill with their talons — four powerful toes per foot, one of which can swivel backward to form an X-shaped grip that is very hard for prey to escape. Small prey is usually swallowed whole, head first. Larger prey is carried to a perch and pulled apart. Owls have no crop and swallow with little chewing, which sets up one of the most useful quirks in ornithology: the pellet, which we’ll get to below.
What Different Owls Eat: Species by Species
Size is destiny in the owl world. Here’s how the menu changes across some familiar North American species, from smallest to largest.
| Owl | Typical weight | Main foods |
|---|---|---|
| Elf owl | 1–2 oz | Moths, beetles, crickets, scorpions (stingers removed) |
| Eastern screech-owl | 4–9 oz | Large insects, mice, small birds, earthworms, crayfish |
| Burrowing owl | 5–8 oz | Grasshoppers, beetles, mice, lizards, small snakes |
| Barn owl | 14–25 oz | Voles, mice, shrews, rats — rodents almost exclusively |
| Barred owl | 1–2.3 lbs | Mice, voles, squirrels, frogs, crayfish, fish, smaller owls |
| Snowy owl | 3.5–6.5 lbs | Lemmings above all; also hares, ptarmigan, waterfowl |
| Great horned owl | 2–5.5 lbs | Rabbits, rodents, skunks, ducks, herons, other raptors |
Outside North America the same rule holds, with local twists: African and Asian fishing owls snatch fish from the water’s surface with bare, spiky-soled toes; the little owl of Europe eats a surprising number of earthworms; and the huge Eurasian eagle-owl takes prey up to the size of foxes and young deer fawns on rare occasions.
The Rodent Specialists
If owls have a signature dish, it’s the vole. Meadow voles, field mice, deer mice, shrews, and rats make up the bulk of the diet for most mid-sized owls, and the barn owl has turned rodent-catching into a profession. A hunting barn owl quarters low over fields like a giant pale moth, listening, then drops feet-first into the grass. A single barn owl family can consume on the order of a thousand or more rodents in a breeding season, which is why farmers around the world put up nest boxes rather than poison bait — the owls are cheaper, safer, and self-refilling.
This is also why owls are a genuine ally if you have a mole, vole, or mouse problem in a rural yard. An owl won’t eliminate burrowing rodents entirely, but a resident owl applies steady, free pest control pressure every single night, all year long.
Big Game: What the Largest Owls Take
The great horned owl has the most varied diet of any North American raptor — more than 500 prey species have been documented. It is one of the very few predators that routinely kills skunks (owls have a famously poor sense of smell, so the skunk’s main defense is wasted), and it will take prey heavier than itself, including jackrabbits, geese, and great blue herons. It also eats other predators: crows, falcons, barred owls, and young foxes all appear on the menu. Squirrels are usually safe only because they sleep hidden at night — see where squirrels sleep — but any squirrel caught in the open at dusk is fair game.
Bats, too, show up in owl diets more often than people expect; owls are among the leading natural predators of bats, ambushing them as they stream out of roosts at dusk. And while no owl hunts adult deer, owls belong to the same nighttime predator guild we cover in what eats deer — the community of hunters that shapes how prey animals move after dark.
Owl Pellets: How We Know the Menu So Precisely
Owls swallow prey whole or in big pieces, bones and all, but their stomachs can’t digest bone, fur, feathers, or insect shells. Instead of passing that material, the owl’s gizzard packs it into a compact pellet that the bird regurgitates six to ten hours or more after a meal, usually at a favorite roost. Pellets aren’t droppings — they’re clean, odorless capsules of skulls, jaws, and fur.
For scientists, pellets are a nightly written record. Dissect a season’s worth of pellets from under a roost and you can reconstruct exactly what that owl ate: how many voles, which shrew species, the occasional songbird. Much of what we know about owl diets — including the barn owl’s staggering rodent totals — comes from decades of patient pellet analysis. Finding a pile of pellets under a conifer is also one of the most reliable ways to discover an owl living near you.
How Much Does an Owl Eat?
Owls run hot. A small owl may eat a quarter of its body weight or more in a night, and even the big species typically need several mice-worth of food daily. Demand spikes enormously during nesting season: a pair of barn owls feeding a brood of five or six young must deliver dozens of rodents every night for weeks. When prey crashes — a lemming bust on the tundra, a vole cycle bottoming out — owls respond by laying fewer eggs, skipping breeding entirely, or wandering far outside their normal range in search of food. Feast-or-famine is built into the owl lifestyle, and hunger, not cold, is what kills most owls in winter.
A Menu That Changes With the Seasons
An owl’s diet is a moving target across the year. Spring and summer are the fat months: rodent populations explode with new litters, insects are everywhere for the small owls, and naive young rabbits and squirrels wander into the open. This abundance is precisely why owls time their nesting to end in it — hungry owlets fledge into the easiest hunting of the year. Fall brings a shift toward whatever concentrates: migrating songbirds for the bird-hunters, rodents fattening on seed and waste grain around farms. Winter is the test. Insect-eaters must leave or starve, which is why species like the flammulated owl migrate; the rodent specialists stay and work harder, hunting longer hours for prey that now moves beneath snow. Deep snowpack actually favors the hearing-hunters — a great gray owl plunge-diving through crust it cannot see through is the most extreme example of sound-only hunting in the bird world — but an ice storm that seals the snow under a hard glaze can starve owls across a whole region in a week. Biologists reading pellets can watch these seasonal switches happen: the same roost that yields moth wings and beetle shells in July gives up nothing but vole skulls in January.
Feeding the Hunt: What Owls Mean for Your Property
Because owls eat what most homeowners want gone, they’ve become a quiet tool of integrated pest management. Vineyards and orchards in several countries now install barn owl boxes at scale, trading a few dollars of lumber for year-round rodent suppression; the same logic works on any rural or semi-rural property with open hunting ground. Two rules make it work. First, provide the housing — a properly sized box, mounted high, away from constant human traffic. Second, and non-negotiable: stop using rodenticide. Anticoagulant rat poisons work slowly, and a dosed mouse staggering in the open is exactly the target an owl selects; secondary poisoning is one of the leading documented killers of owls in settled areas. A property that offers clean prey and safe housing will often recruit its own night shift within a season or two — and a single owl family removes more rodents in a summer than a bucket of traps.
Frequently Asked Questions
Do owls eat cats or small dogs?
It’s rare, but a great horned owl is physically capable of striking a kitten or a very small adult cat, and occasional incidents are documented. Most pets are far too heavy for any owl to carry — an owl can only lift roughly its own body weight for short distances. Still, in owl country the sensible rule is the same one that protects cats from coyotes and cars: keep them indoors at night.
Do owls drink water?
Almost never. Owls get nearly all their moisture from the body fluids of their prey, and their kidneys are efficient enough that a diet of fresh meat covers their needs. Owls will occasionally drink or bathe at a shallow creek or bird bath, especially in hot weather, but unlike seed-eating birds they don’t depend on standing water.
Do owls eat other owls?
Yes. Great horned owls kill and eat barred owls often enough that barred owls avoid settling in great horned territory; barred owls in turn prey on screech-owls, and screech-owls will take the tiny saw-whet. This “owl-eat-owl” ladder is a real force in where each species chooses to live — the small owls trade prime habitat for safety.
Will an owl clean out my backyard songbirds?
Unlikely. Most owls hunt at night when songbirds are hidden and asleep, so birds are a minor part of most owl diets — rodents attracted to spilled feeder seed are the real draw. The exceptions are bird-hunting specialists like the northern pygmy-owl, a bold daytime hunter of chickadees and finches, but even it takes far fewer birds than a neighborhood Cooper’s hawk does.
