Great Horned Owl: The Tiger of the Sky

The great horned owl (Bubo virginianus) is the most powerful owl in the Americas and, by common reputation, the tiger of the sky — a stocky, broad-winged predator with a wingspan approaching 1.5 m, tufted “horns” that are not horns, and a prey list longer than that of almost any other North American raptor. It is the owl that hunts skunks, takes other owls, and hoots on cold January nights while most other birds are still weeks away from nesting. If you hear an owl calling in winter across most of North America, there is a good chance it is this one.

Why It Is Called the Tiger of the Sky

The nickname is earned. Where most owls specialise — a fish owl takes fish, a pygmy owl takes small birds — the great horned owl takes almost anything it can subdue. It hunts by ambush, dropping from a perch in near silence, and it has the strength to overwhelm prey at or above its own body mass. Few birds of prey are as willing to attack something that can fight back, and even fewer succeed as often. Its combination of power, stealth, and adaptability puts it at the top of the nocturnal food chain across two continents.

It is worth noting that the great horned owl is not a single uniform bird but a complex of some fifteen or more recognised subspecies, differing in size and shade from the pale birds of the arid south-west to the dark, richly marked owls of the humid south-east. Northern birds are typically larger than southern ones, and females are consistently larger than males — a pattern common among owls.

Ear Tufts and the Owl’s Other Senses

The most misunderstood feature of any owl is the ear tuft, and the great horned owl is the classic example. Those two feathered “horns” have nothing to do with hearing. They are simply raised feathers, controlled by muscles, used in communication and camouflage. They break up the bird’s outline when it roosts against a branch, and they signal mood — flattened when the bird is relaxed or alarmed, raised when it is alert. The actual ears are openings hidden at the edges of the facial disc, and in many owls, including this one, they are set asymmetrically: one higher on the skull, one lower, and sometimes angled slightly differently. That asymmetry is a precision instrument, allowing the brain to compare the tiny difference in the time and loudness with which a sound reaches each ear and so fix the source in three dimensions.

The facial disc — the ring of stiff feathers framing the face — funnels sound toward those openings, like a shallow dish. Hearing, not sight, is the owl’s sharpest sense at night. The eyes are also remarkable but far less flexible than legend suggests: they are enormous and fixed in their sockets, so the bird cannot roll or flick them. To look around, it must move its head, and it can turn it roughly 270 degrees thanks to a neck with many vertebrae and blood vessels that can swell to keep the brain supplied. A translucent third eyelid, the nictitating membrane, sweeps across the eye to clean and protect it. Finally, the great horned owl, like most owls, flies almost silently: the leading edges of its flight feathers are fringed and the upper surfaces velvety, breaking up the turbulence that makes ordinary wings whoosh. Our guide to the engineering of silent flight explains the mechanism in detail, and owls as masters of night sets out the broader sensory story.

Identification at a Glance

At distance, the combination of a heavy body, a big round head with obvious tufts, and flashing yellow eyes is enough. A barn owl, by contrast, has a white heart-shaped face and no tufts; a snowy owl of the far north is largely white. For a disciplined method of telling raptors apart in the air, see identifying birds of prey.

Range, Habitat and Conservation

Few owls are so adaptable. The great horned owl breeds from Alaska and northern Canada south through the United States, Mexico, and Central America and into South America, occupying forests, prairies, deserts, wetlands, farmland, and city parks alike. It needs two things above all: somewhere to nest and a supply of prey, and it can find both almost anywhere. It does not build its own nest; instead it takes over the old stick nests of red-tailed hawks, ravens, or eagles, or uses tree cavities, cliff ledges, broken snags, and even ledges on buildings.

Because of this flexibility, the species is assessed as Least Concern globally. Local populations have been reduced by persecution, vehicle collisions, and rodenticide poisoning, but the bird’s range and numbers remain vast, and its tolerance of human settlement sets it apart from most large raptors.

Diet and Hunting

The prey list is the point. Few predators on the continent take such a range of victims, from insects to animals heavier than themselves.

The method is patient and lethal. The bird sits motionless on a favoured perch and listens; when it locates something, it drops in a silent, wings-folded glide and strikes with the talons. The grip of those talons is the functional heart of the animal — powerful enough to kill prey larger than the owl and to break heavy bones. Indigestible fur, bones, and feathers are compacted and coughed back up as pellets, which are among the most useful clues for anyone studying what an owl has eaten.

Voice, Courtship and Early Nesting

The voice is deep and unmistakable: a rhythmic series of soft, low hoots, often rendered as “hoo-hoo-hooo, hoo, hoo,” delivered as a territorial claim. The female’s hoots are higher pitched than the male’s, and pairs frequently duet, one answering the other. That duetting re-establishes the pair bond each season, and pairing begins remarkably early — courtship can start in December, and the eggs are usually laid in January or February, with northern birds later and southern birds occasionally nesting even earlier.

Nesting this early is a gamble, but a calculated one. It gives the young, which take months to become independent, the maximum window of rising prey numbers later in spring; and the adults’ feathered legs let them incubate through bitter cold. Clutches run from one to four eggs, incubated for roughly 30 to 35 days, mostly by the female while the male supplies food. The chicks grow fast on a rich diet, leaving the nest at about six to seven weeks and flying competently a few weeks after that, though they stay with their parents into the autumn.

Frequently Asked Questions

Are the great horned owl’s ear tufts actually ears?

No. The tufts are feathers, used for camouflage and display, and have no hearing function. The real ears are openings hidden at the edge of the facial disc, and they are placed asymmetrically so the owl can pinpoint the direction of a sound with great accuracy.

What does a great horned owl call sound like?

A deep, soft, rhythmic hoot — most often described as a series of four or five low notes with a distinctive rhythm. Pairs duet, with the female’s voice pitched higher than the male’s. It is a sound that carries well on still winter nights.

Can a great horned owl really kill a skunk?

Yes, routinely. The owl’s sense of smell is weak, so a skunk’s spray is no deterrent, and its powerful grip kills quickly. Skunks, along with young porcupines, feature regularly in the species’ diet — a good demonstration of how little it is limited by prey that most predators avoid.

Why do great horned owls nest so early in the year?

Early nesting maximises the time the slow-growing young have before winter, and it coincides with the first small mammals becoming available in spring. The adults’ feathered legs allow them to sit through freezing conditions that would defeat a bare-legged bird.

Is the great horned owl endangered?

No. It is globally classified as Least Concern and is one of the most widespread and successful owls in the Americas. Local declines occur where persecution and poisoning are heavy, but the overall population is secure.

Continue with the Great Gray Owl, or meet the Arctic counterpart in the Snowy Owl.