Eastern Screech-Owl

Eastern screech-owls live closer to more people than any other owl species in North Louisiana, and almost nobody knows they are there. Megascops asio roosts during the day inside tree cavities — natural hollows, old woodpecker holes, nest boxes, and occasionally the more creative shelter options that screech-owls discover in suburban landscapes — pressed flat against the interior wall with eyes closed, ear tufts flattened against the skull, and plumage compressed into a shape that mimics bark so convincingly that even someone who peers directly into the cavity may not register the owl's presence.

At dusk, the owl opens its enormous yellow eyes, stretches, and emerges to take a hunting position on a branch near the cavity entrance, beginning a night of silent predation on mice, insects, frogs, and small birds while the homeowner whose yard the owl occupies sleeps 30 feet away without any awareness that a fierce little predator with a prey list ranging from grasshoppers to bobwhite quail has been living in the dead oak by the driveway for years.

Then the owl calls. A descending, tremulous whinny — not a screech despite the name — drifts through the neighborhood at 2 AM, and the sound is so perfectly eerie, so precisely calibrated to raise the hair on the back of any human neck within hearing distance, that it has earned the species descriptions ranging from "most solemn graveyard ditty" to "the mutual consolation of suicide lovers." The call sounds like a tiny, quavering horse, and the owl that produces this haunting, quavering sound weighs less than a regulation baseball and stands about 8 inches tall with its distinctive ear tufts raised to full height.

North Louisiana's most common and most effective avian predator in wooded suburban habitats operates entirely at night, conceals itself entirely during the day, and communicates through a voice that sounds like something from a haunted forest rather than from the pecan tree next to the patio.

What They Look Like

Eastern screech-owls come in two color morphs — gray and rufous (reddish-brown) — and the color ratio shifts geographically. In North Louisiana, the rufous morph is common, though gray morphs occur throughout the region, and the two morphs interbreed without regard to color.

Both morphs display the same intricate pattern of streaks, bars, and vermiculations (fine, wavy lines) that provides extraordinary camouflage against tree bark — a screech-owl pressed against a bark surface with eyes closed and ear tufts raised disappears so completely that the owl becomes, for all practical identification purposes, part of the tree. People walk past roosting screech-owls daily without detecting them, and the camouflage is effective enough that researchers studying the species sometimes lose track of a tagged bird sitting in plain sight on a branch 10 feet away.

Body size is small — 6 to 10 inches in length, with an 18 to 22-inch wingspan and a weight of 5.5 to 6.5 ounces, roughly the size and heft of a softball. Ear tufts (which are feather extensions, not actual ears) stand prominently when the owl is alert or alarmed, creating the characteristic "horned owl" silhouette in miniature. Large yellow eyes dominate the facial disk, and the bill is pale yellowish-green — a feature that helps distinguish eastern screech-owls from the western screech-owl where the two species' ranges approach each other, though only the eastern species occurs in North Louisiana.

Sound

Eastern screech-owls produce two primary vocalizations that every North Louisiana resident who lives within earshot of trees — which means every North Louisiana resident — should learn, because the sounds announce the nocturnal presence of one of the region's most efficient small predators operating in the immediate vicinity of your home.

The whinny — a descending, tremulous trill lasting 1 to 2 seconds — serves as the primary territorial and contact call. The pitch drops steadily from start to finish while the amplitude wavers in a tremolo pattern that gives the call its quavering, horse-like quality. Neighboring screech-owls exchange whinnies across territorial boundaries in vocal duels that can continue for extended periods on clear, calm nights, and the sound carries surprisingly well through suburban neighborhoods.

A second call — the monotone trill — is a steady, even-pitched purring sound lasting 3 to 5 seconds that serves as a pair-contact call and a call between parents and fledglings. Less eerie than the whinny, the trill sounds mechanical rather than ghostly, and birders who learn both calls can distinguish territorial advertisement (whinny) from pair-bond maintenance (trill) by ear.

Despite the common name, screech-owls do not screech. The misnomer persists because early naturalists apparently heard the calls and decided "screech" captured the eerie quality of the sound, and by the time ornithologists realized the description was inaccurate, the name had stuck permanently.

Where They Live

Eastern screech-owls occupy the broadest ecological niche of any owl in their range — an adaptability that Birds of the World confirms and that anyone who has found a screech-owl roosting in a hanging planter, a newspaper tube, or a dryer vent can personally verify.

Open mixed woodlands, deciduous forests, pine-hardwood stands, riparian corridors along streams and bayous, wooded suburban neighborhoods, city parks with mature trees, rural woodlots, orchards, and any landscape with mature trees containing cavities works fine for the species. In North Louisiana, screech-owls occupy every parish and every wooded habitat type from the interior of Tensas River NWR's bottomland forest to the live oaks and pecans in a Shreveport subdivision to the loblolly pines along a Winn Parish logging road.

Suburban and urban habitats support screech-owl densities that frequently exceed densities in wildland forests — a pattern that surprises people who assume that "wild" habitat must be better owl habitat than a neighborhood. Suburban landscapes provide abundant cavities (old trees with natural hollows, abandoned woodpecker holes, nest boxes, building crevices, and the assorted human objects that screech-owls adopt as roost sites), concentrated prey populations (house sparrows, house mice, anoles, large insects attracted to outdoor lighting), and critically — reduced predation pressure from great horned owls, which represent the screech-owl's most dangerous predator and which occur at lower densities in suburban settings than in extensive forest.

A screech-owl defending territory in a Monroe or Ruston neighborhood may enjoy better hunting (streetlights attract moths, feeders concentrate mice and sparrows), more cavity options (old trees plus artificial structures and nest boxes), and significantly fewer great horned owls than a screech-owl occupying deep forest — an ecological calculation that explains the species' remarkably successful colonization of human-dominated landscapes across North Louisiana and the broader Southeast.

Louisiana-specific research has documented screech-owls choosing nest cavities in trees festooned with lianas (climbing vines) more frequently than expected based on vine availability in the forest, suggesting that the vine-draped trees so common in North Louisiana's bottomland hardwood forests may provide particularly attractive nesting substrate — possibly because the vines add visual concealment to the cavity entrance, or because vine-covered trees support higher densities of anoles, tree frogs, and insects that benefit foraging owls hunting near the nest site.

What They Eat

Eastern screech-owls eat almost everything that is smaller than they are and some things that are impressively close to their own size. The prey list reads like a comprehensive inventory of North Louisiana's small animal community: insects (moths, beetles, crickets, grasshoppers, cicadas, caterpillars, roaches), crawfish, earthworms, small mammals (mice, rats, shrews, moles, flying squirrels, chipmunks, bats), small birds (sparrows, warblers, cardinals, wrens, even the occasional bobwhite quail or American woodcock), reptiles (green anoles, fence lizards, ground skinks, small snakes), amphibians (tree frogs, toads, cricket frogs, small salamanders), small fish, and spiders.

Studies have documented up to 68 percent of the breeding-season diet consisting of small birds — a predation intensity that makes the screech-owl one of the most significant avian predators on songbird populations in suburban North Louisiana, operating under cover of darkness while the songbirds sleep and the homeowners who stock the feeders that attract the songbirds sleep too.

Hunting technique varies with prey type and habitat structure. Screech-owls typically hunt from a perch — sitting on a low branch, fence post, or building edge and scanning the ground and nearby vegetation for movement, then dropping silently onto detected prey with talons extended. Near outdoor lighting (streetlights, porch lights, security lights), screech-owls exploit the moth and beetle concentrations that artificial light attracts, picking insects off illuminated walls and fence surfaces or snatching flying insects from the air in short, fluttering sallies.

In wet habitats, screech-owls wade into shallow water to catch small fish, crawfish, and aquatic invertebrates — a behavior that most people do not associate with owls but that reflects the species' extraordinary dietary flexibility and its willingness to exploit any accessible food source regardless of whether the source requires standing in water.

Diet shifts seasonally with reliable patterns: insects dominate during warm months when moths, beetles, and cicadas are abundant and easy to capture near artificial lights; small mammals and birds become the primary prey during winter when insect availability collapses and the owl must switch to warm-blooded prey that remains active through the cold months.

A screech-owl perched on a branch near a streetlight on a June night in Ouachita Parish hunts the moths and beetles attracted to the illumination — a strategy that converts human infrastructure into owl hunting habitat with an efficiency that approaches perfection. A screech-owl hunting the same neighborhood in January focuses on house mice around bird feeders and house sparrows roosting in building crevices — the same human infrastructure supporting a completely different prey-capture strategy.

Males stockpile food during the early nesting period, caching surplus prey items in the nest cavity to ensure the female and young nestlings have food available continuously even during nights when hunting is unproductive. Cached items — dead mice, small birds, and large insects stored alongside the eggs or nestlings — can accumulate to surprising quantities during productive hunting periods, creating a larder that buffers the family against the inevitable variation in nightly hunting success.

Breeding

Eastern screech-owls nest in natural tree cavities, abandoned woodpecker holes (particularly flicker and pileated cavities), and nest boxes — the same cavity types used by kestrels, wood ducks, and flying squirrels, creating competition for a limited housing resource. Pairs mate for life but accept replacement mates when a partner disappears. Courtship involves an elaborate display in which the male approaches the female from branch to branch, bobbing and swiveling his head, bobbing his entire body, and slowly winking one eye at the female in a gesture that appears comically deliberate but that apparently communicates pair-bond quality or male fitness through mechanisms that researchers have not fully decoded.

Nest cavities are typically 5 to 30 feet above ground in deciduous trees — oaks, sweetgums, pecans, sycamores, and elms are common nest-tree species in North Louisiana. Pairs frequently reuse the same cavity in consecutive years, and one female was documented using the same nest box for 8 consecutive seasons. No nesting material is added; eggs rest on the natural debris at the cavity bottom.

Females lay 3 to 5 white eggs, incubating for approximately 26 to 30 days while the male provides food. Nestlings remain in the cavity for about 31 days, and fledglings stay near the nest site for 8 to 10 weeks after departure while the parents continue feeding and teaching hunting skills.

First-year mortality runs approximately 70 percent — a staggeringly high attrition rate driven primarily by predation, starvation during the first independent winter, vehicle collisions, and the general hazards of being a small, inexperienced owl navigating a landscape full of things that want to eat you. Adults that survive the first year experience approximately 34 percent annual mortality thereafter, and the combination of high juvenile mortality with lower adult mortality creates a population structure in which the breeding population is experienced, site-faithful, and efficient at exploiting established territories while the juvenile surplus absorbs the brunt of the attrition that eliminates young owls before they can find territories of their own.

Predators

Great horned owls are the eastern screech-owl's most significant predator, and the relationship between the two species shapes screech-owl habitat selection across North Louisiana. Screech-owls avoid nesting and roosting in dense, continuous forest where great horned owl density is highest, preferring instead the suburban and semi-open woodland habitats where great horned owls are less common.

A screech-owl that establishes territory in a Ruston neighborhood with scattered mature trees faces lower great horned owl predation risk than a screech-owl nesting in the interior of a large forest tract — a risk differential that partly explains why screech-owls achieve their highest densities in suburban settings rather than in the wildland forests that most people assume represent optimal owl habitat.

Other predators include Cooper's hawks and sharp-shinned hawks (which take screech-owls flushed from roosts during the day), rat snakes and gray rat snakes (which climb to cavity nests and consume eggs and nestlings), raccoons (which reach into cavities to extract eggs and small nestlings), fox squirrels (which evict screech-owls from cavities and appropriate the roost or nest site for their own use), and domestic cats (which take screech-owls foraging on or near the ground). Barred owls also occasionally prey on screech-owls, adding another large-owl predation pressure in the bottomland forest habitats where both species coexist.

Vehicle collision represents a major mortality source for screech-owls, particularly along roads that cut through wooded habitat. Screech-owls hunting from low perches near roads may fly across the road surface at vehicle-windshield height, and dark feathers, silent flight, and nighttime habits creates collision conditions that kill substantial numbers of birds annually. Electrocution on power lines and transformers, window collisions, and drowning (screech-owls bathe frequently and can become waterlogged in rain barrels, stock tanks, and other open water containers) account for additional mortality.

Color Morphs

Eastern screech-owls display a genetic polymorphism in plumage color that produces two primary morphs — gray and rufous (reddish-brown) — and a less common intermediate brown morph. Gray morphs predominate in the northern and western portions of the range, while rufous morphs increase in frequency across the Southeast, and in North Louisiana both morphs occur at substantial frequencies with rufous morphs being somewhat more common than gray. The two color forms interbreed freely, and a nesting pair may include one gray and one rufous adult producing offspring of either morph.

Research has explored whether the color morphs confer different adaptive advantages in different habitats or climatic conditions. Rufous morphs may experience higher mortality during severe winters (their slightly different feather structure may provide less insulation), which could explain the geographic pattern — rufous morphs predominate in the milder South where winter severity rarely reaches levels that differentially affect the two morphs, while gray morphs dominate in the colder North where winter survival pressure favors the gray form. In North Louisiana's mild climate, both morphs survive winter equally well, which allows the rufous morph to maintain the high frequencies observed across the southeastern portion of the range.

From a birding and wildlife-watching perspective, the color morphs add a delightful element of surprise to every screech-owl encounter — you never know whether the owl emerging from a cavity at dusk will be gray, warm rufous, or the uncommon intermediate brown until the bird appears and the light catches the plumage, and the color variation means that screech-owl identification requires recognizing the species' distinctive shape (ear tufts, compact body, large facial disk), size (softball-sized), and habitat context rather than relying on a single expected color pattern that might not match the individual owl in front of you.

Population

Eastern screech-owl populations are considered stable across most of their range, and the species faces no conservation concern at the population level. Exact population estimates are difficult to generate for a nocturnal, cavity-roosting species that is chronically underdetected by standard survey methods, but the screech-owl's abundance in suburban and urban habitats suggests that the species has benefited from human landscape modification rather than suffered from the habitat loss and fragmentation that has reduced populations of more specialized owls.

In North Louisiana, screech-owls are common in every parish and detectable in any wooded neighborhood, park, or forest that contains mature trees with cavities. Christmas Bird Count data consistently detect screech-owls, though counts likely underrepresent actual abundance because the nocturnal survey effort during CBC periods is limited.

The species' willingness to use nest boxes provides a management tool that can increase local screech-owl density in areas where natural cavities are scarce — a simple wooden box with a 3-inch entrance hole, mounted 10 to 20 feet high on a tree in a wooded yard, can attract a roosting or nesting screech-owl within the first season of installation and provide years of fascinating nocturnal wildlife interaction for the homeowner who checks the box periodically and discovers a small, ear-tufted owl staring back from the dark interior.

Accessibility

Learn the whinny. That descending, quavering trill is the single best way to find a screech-owl, and the sound carries through suburban neighborhoods well enough to detect the species from a porch or an open car window on a quiet night.

Visitors with low or no vision get the full wren experience through sound alone — the whinny, the monotone trill, and the various alarm and contact calls paint a continuous audio portrait of what the bird is doing, where the bird is going, and how agitated the territory holder feels about whatever just walked past. You may never see the owl. You will always know exactly where the owl is.