Burrowing Owl

Athene cunicularia

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brown white small raptor grassland desert urban nocturnal migratory year-round common widespread

About the Burrowing Owl

The Burrowing Owl (Athene cunicularia) is a unique member of the family Strigidae, noted for its uncommon terrestrial lifestyle among owls. Unlike its arboreal relatives, this species prefers to nest and roost in burrows, often occupying those abandoned by prairie dogs or other burrowing animals. This behavior is particularly noteworthy as it highlights the owl's adaptability and resourcefulness, allowing it to thrive in open landscapes where tree cover is scarce. The Burrowing Owl is predominantly found in the Americas, with a range extending from the grasslands of Canada, through the Great Plains and southwestern United States, and into Central and South America. These birds are highly adaptive, inhabiting a variety of environments from deserts to prairies. In many regions, they have even adapted to urban settings, making use of vacant lots and airport grounds. The ecological role of the Burrowing Owl is significant; it helps control insect and rodent populations, acting as a natural pest deterrent. Seasonal behaviors of the Burrowing Owl include partial migration in northern populations, where harsh winters drive them to milder climates. In contrast, southern populations tend to be sedentary, remaining near their burrows year-round. This species is diurnal, which is unusual for owls, and is often seen hunting during daylight hours. The Burrowing Owl's presence is a vital indicator of healthy grassland ecosystems, as they depend on the burrowing activity of other species, such as prairie dogs and ground squirrels, to create suitable nesting sites. Preserving these ecosystems is crucial for maintaining the owl's habitat and the biodiversity of the region.

The Burrowing Owl belongs to the family Strigidae, within the order Strigiformes. These birds typically live typically 6-8 years in the wild, with a maximum recorded lifespan of 9 years..

How to Identify a Burrowing Owl

The Burrowing Owl is a small owl, standing about 19-28 cm tall, with a wingspan of 50-61 cm. Its plumage is predominantly brown with white spotting, which provides camouflage against the open terrain it inhabits. The facial disk is distinct yet less pronounced than in other owl species, highlighted by bright yellow eyes that are a key identifying feature. Unlike many owl species, Burrowing Owls have long legs that aid in their terrestrial lifestyle. Juveniles are similar in appearance to adults but display more uniform brown plumage with less spotting and a paler facial disk. Males and females are similar in size and appearance, although females are generally heavier. The Burrowing Owl can be confused with the Short-eared Owl, but the latter is larger, lacks the Burrowing Owl's distinctive long legs, and typically inhabits different habitats. In flight, the Burrowing Owl's silhouette is characterized by rapid, shallow wingbeats and a buoyant flight pattern. When perched, their upright posture and ground-level positioning are distinctive, often seen bobbing up and down as they survey their surroundings.

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Burrowing Owl Habitat and Range

Preferred Habitat

Burrowing Owls inhabit open grasslands, deserts, and prairies where trees and tall vegetation are sparse. In North America, they often associate with prairie dog towns in the Great Plains, which provide abundant burrows for nesting. They are also found in similar open landscapes in Central and South America, including the pampas and coastal dunes. The Burrowing Owl can adapt to urban and suburban environments, utilizing airport grounds, golf courses, and vacant lots. They typically live at elevations ranging from sea level to approximately 2,500 meters. Seasonal shifts in habitat are primarily influenced by temperature changes, with northern populations moving southward during colder months. In urban areas, they demonstrate remarkable adaptability, often thriving where suitable natural habitats have been altered or destroyed.

Geographic Range

The Burrowing Owl's range spans North and South America. In North America, it breeds from southern Canada through the western and central United States, including states like California, Arizona, and Florida. Northern populations migrate to warmer climates in Mexico and Central America during the winter. In South America, the Burrowing Owl resides year-round, with populations in Argentina, Brazil, and Chile being particularly robust. Migration corridors are primarily along the central and western flyways, with some owls utilizing coastal routes. Population density is highest in regions with abundant burrowing mammals, such as the Great Plains and certain areas of South America's grasslands. While their range is extensive, local populations can fluctuate significantly based on habitat availability and environmental conditions.

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What Does the Burrowing Owl Eat?

The Burrowing Owl primarily feeds on insects and small mammals, playing a crucial role in controlling pest populations. Grasshoppers, beetles, and crickets form the bulk of their diet in warmer months, while small rodents like mice and voles become more significant in colder seasons. This dietary shift helps them adapt to seasonal availability of prey. Foraging primarily occurs during dusk and dawn, although they are known to hunt in full daylight, a behavior uncommon among owls. Their hunting technique involves perching on low vantage points or the ground, scanning for movement before swooping down to capture prey. Prey size typically ranges from small insects to rodents weighing up to 50 grams. The Burrowing Owl's opportunistic feeding strategy allows it to exploit a variety of food sources, contributing to its resilience in diverse environments.

Burrowing Owl Behavior and Social Structure

Burrowing Owls exhibit a fascinating array of behaviors that set them apart from other owl species. They are primarily diurnal, with peak activity occurring at dawn and dusk. Their social structure is relatively loose, with pairs often nesting in proximity to one another, especially in areas with abundant burrows. Territorial behavior is pronounced during the breeding season, with males performing aerial displays and vocalizations to defend their nesting area. Courtship involves a series of bowing and cooing displays by the male, often accompanied by food offerings to the female. Flocking behavior is observed outside the breeding season, with groups of owls banding together for protection against predators. When threatened, Burrowing Owls resort to a variety of defensive behaviors, including puffing up to appear larger, hissing, and performing a distinctive 'bobbing' motion. Their daily activities include sunning themselves at the entrance of their burrows, preening, and engaging in playful interactions, particularly among juveniles.

Burrowing Owl Nesting and Reproduction

Burrowing Owls typically nest in abandoned burrows created by mammals such as prairie dogs, ground squirrels, and tortoises. They may also dig their own if necessary. The nest is lined with materials like grass, feathers, and dung, which may help in regulating the microclimate within the burrow. Clutch size ranges from 6 to 11 eggs, with incubation lasting about 28 to 30 days. The female primarily incubates the eggs, while the male provides food. After hatching, both parents share feeding duties. Fledging occurs approximately 44 days after hatching, although young owls may begin exploring outside the burrow earlier. Burrowing Owls typically have one brood per year, but may attempt a second if conditions are favorable and the first brood is successful.

Burrowing Owl Sounds and Vocalizations

The Burrowing Owl's primary call is a series of soft coos and clucks, often described as similar to the sound of a small dog barking. During the breeding season, males vocalize to establish territory and attract a mate. Alarm calls are sharper, resembling a short 'kak' sound, used to warn of predators or intruders. Juvenile owls produce a high-pitched chirp to solicit food from parents. They are not particularly vocal at dawn, unlike many other birds, but their calls can be heard throughout the day and night, especially during periods of heightened activity.

Interesting Facts About the Burrowing Owl

1Burrowing Owls often decorate their burrows with animal dung, attracting insects which they then eat.
2Despite their small size, Burrowing Owls are capable of taking prey larger than themselves, showcasing their hunting prowess.
3These owls can mimic the rattling sound of a rattlesnake when threatened, deterring potential predators.
4In some cultures, the Burrowing Owl is seen as a symbol of protection and is associated with good fortune.
5The Burrowing Owl's long legs are an adaptation for running, allowing them to chase prey on foot as well as in flight.
6In urban areas, Burrowing Owls have been known to nest in drainpipes and under man-made structures, illustrating their adaptability.
7Burrowing Owls have been observed using their wings to cover their eyes against the sun, akin to a natural sunshade.

Burrowing Owl Conservation Status

The Burrowing Owl is currently listed as Least Concern by the IUCN, though certain populations face significant threats leading to local declines. Habitat destruction due to agricultural expansion, urban development, and eradication of burrowing mammals pose major challenges. Conservation efforts focus on preserving grassland habitats and creating artificial burrows to support population recovery. Historical population changes indicate significant declines in areas like California, where habitat loss has been most pronounced. Protection of key habitats and public education about the ecological role of this species remain crucial for its conservation.