The Burrowing Owl (Athene cunicularia) is an anomaly among North American birds of prey. Instead of perching in trees or nesting on cliffs, this small, long-legged owl makes its home beneath the surface of the earth. Inhabiting open grasslands, prairies, and arid scrublands across the Americas, the Burrowing Owl is a charismatic and increasingly threatened resident of the plains. Its unique lifestyle—a combination of ground-dwelling, diurnal hunting, and reliance on other animals for shelter—makes it a fascinating and vital component of grassland ecosystems.
A Distinctive Appearance and Posture
The Burrowing Owl is small, standing only about 9 to 11 inches tall, but its long, bare legs give it a striking, upright posture, making it look much taller than other owls of similar size. Unlike many owls, it lacks the prominent ear tufts.
Key Identification Features
Plumage: Its head, back, and wings are sandy brown, spotted and barred with white. The chest and belly are pale white, heavily barred or spotted with brown.
Eyes: Like most owls, it has large, bright yellow eyes, but its visual acuity is adapted for both day and night hunting.
Facial Expression: It has a somewhat flat-faced appearance framed by whitish eyebrows, often giving it a perpetually surprised or fierce expression.
Legs: The most notable feature is its long, unfeathered legs which are perfectly adapted for walking, running, and hopping along the ground, a necessity for a bird that spends most of its life on foot.
Diurnal Activity
While most owls are strictly nocturnal, the Burrowing Owl is crepuscular and diurnal, meaning it is active during twilight hours (dawn and dusk) and often hunts during the day. During the hottest parts of the day, they stand guard outside their burrows, vigilant for both prey and predators.
The Burrowing Lifestyle
The most defining characteristic of this species is its reliance on subterranean homes, which is reflected in its scientific name; cunicularia means "digger" or "miner."
Shelter from Others
Despite its name, the Burrowing Owl rarely digs its own primary nesting burrow. Instead, it is dependent on the excavation efforts of other animals, exhibiting a form of commensalism.
Prairie Dogs: In the American Great Plains, the owls rely heavily on the abandoned burrows of Black-tailed and Gunnison’s Prairie Dogs.
Ground Squirrels: In the western U.S., they often use the burrows of various ground squirrels, badgers, or tortoises.
The owls will modify and enlarge the existing tunnels to suit their needs, often creating multiple entrances and chambers. The burrow serves as a safe nest site, a refuge from extreme weather, and a secure escape from predators.
Decorating the Home
Burrowing Owls are known for their peculiar habit of lining the entrance and interior of their burrows with various materials, including manure, grass, and trash. The use of manure—particularly dried cattle or horse dung—is believed to serve a dual purpose: it acts as camouflage, blending the entrance with the grassland floor, and it acts as a bait or trap for prey, specifically dung beetles, which are an important food source.
Range and Conservation Status
The Burrowing Owl has an extensive range, stretching from southern Canada, through the western and central United States, into Mexico, and down through Central and South America. However, the species is non-migratory only in its southernmost ranges; the northern populations are highly migratory, flying south to wintering grounds in the southern U.S. and Mexico.
A Species of Concern
Despite its wide distribution, the Burrowing Owl is a species of conservation concern throughout North America. The primary threat is habitat loss due to two factors:
Urbanization and Agriculture: The conversion of native grasslands into housing developments and monoculture farms destroys both the foraging habitat and the burrowing animal communities the owls depend on.
Extermination of Prey: Control programs aimed at eliminating prairie dogs and ground squirrels (often considered agricultural pests) remove the essential architects of the owls’ homes, causing localized population collapse.
In Canada and in many US states, the species is listed as endangered or threatened. Conservation efforts now focus on protecting prairie dog colonies and installing artificial burrows in suitable areas.
Diet and Hunting
The Burrowing Owl is an opportunistic generalist, with a diet that shifts depending on the season and location.
Invertebrates: Its main food source, especially during summer, consists of large insects, including grasshoppers, crickets, and beetles.
Vertebrates: They also take small vertebrates, such as mice, voles, lizards, frogs, and small snakes.
Unlike many raptors that hunt by perching and diving, the Burrowing Owl often hunts on the ground. It uses its long legs to run, hop, and pounce on insects and small rodents, often making fast, low flights over the vegetation. When threatened, they exhibit a curious defense mechanism where they hiss and rattle like a rattlesnake from inside the burrow to deter intruders.
The Burrowing Owl stands as a tenacious, charming resident of the prairie—a vital reminder of the complex web of life that sustains grassland ecosystems and a poignant example of a species whose fate is inextricably linked to the survival of the land itself.
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