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Asio clamator

Striped Owl


Asio clamator

(Vieillot, LJP, 1808)
Lechuzón Orejudo
Coruja-orelhuda

Family: Strigidae
Order: Strigiformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

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Synonyms: Pseudoscops clamator, Bubo clamator.

Subspecies:





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Records from Barranqueras

Conservation status according to BirdLife International: Least Concern


Description


This medium-sized strigid is immediately recognized by its slender silhouette and highly prominent, dark ear tufts. Adults generally measure between 12 to 15 inches (30 to 38 centimeters) in length and weigh from 320 to 550 grams, displaying subtle sexual dimorphism with females being marginally larger and heavier. The facial disc is a striking pale grayish-white, boldly outlined by a thick, dark black border that accentuates its facial expressions. Its eyes are a deep cinnamon to dark brown, paired with a stark black bill. The upperparts exhibit a warm tawny-buff base color, heavily mottled and streaked with dark brown and black, whereas the underparts are pale cream or buffy-white, decorated with sharp, bold vertical black streaks running down the breast and belly. In flight, its broad, rounded wings and barred tail allow for highly silent, low-altitude maneuvering through semi-open landscapes.

Geographical distribution: This nocturnal raptor occupies a vast range throughout the Neotropics, stretching from southern Mexico through various Central American nations down to deep South America. It is widely recorded across Colombia, Venezuela, Ecuador, Peru, Bolivia, Paraguay, Uruguay, a large portion of Brazil, and northern to central Argentina. Although its distribution is extensive, it is notably absent from the dense interior core of the Amazon Basin, as well as high-altitude Andean peaks, preferring instead coastal slopes, river valleys, and transition zones.

Habitat: It primarily frequents open and semi-open ecosystems. Typical habitats include savannas, grasslands, agricultural fields, marshes with scattered shrubs, dry forest edges, and deforested areas undergoing secondary succession. Unlike deep-forest owls, this adaptable species thrives in human-modified landscapes, successfully colonizing suburban parks, pastures, and agricultural borders, provided there is adequate ground-level cover or low thickets for daytime roosting.

Feeding: An opportunistic carnivore, its diet is highly plastic and depends on local prey availability. The primary food source consists of small mammals, particularly cricetid rodents, wild guinea pigs, small marsupials, and bats. It also takes a significant number of passerine birds, doves, and large invertebrates such as beetles and grasshoppers. Hunting occurs mostly from low perches or during slow, low-altitude flights close to the ground, where it sweeps down quietly to pin its prey using its strong talons.

Behavior: Strictly nocturnal and crepuscular, it spends daylight hours roosting in dense foliage, close to the ground in tangled vines, or tucked inside tall grass clumps, where its cryptic plumage provides superb camouflage. It is a highly vocal species, particularly active at the start of the breeding season, producing a series of loud, barking shrieks, deep hoots, and bill-clacking. When threatened, it displays a striking defensive posture, fluffing its feathers, spreading its wings wide to double its apparent size, and snapping its beak aggressively.

Nesting: Unlike many of its relatives, this species primarily nests on the ground. It does not construct an elaborate structure; instead, the female scrapes a shallow depression hidden beneath dense grass clumps, thorny bushes, or fallen branches to shield the clutch from predators and extreme weather. Occasionally, it may reuse abandoned stick nests of diurnal raptors in low-to-medium trees. The clutch typically contains 2 to 4 white, elliptical eggs. Incubation is performed solely by the female for about 30 to 33 days, during which time the male is responsible for foraging and delivering food to both his mate and the newly hatched chicks. The young often leave the nest before they are fully capable of flight, hiding in nearby ground vegetation while remaining under parental care.

Conservation status: It is currently listed as Least Concern (LC) on the IUCN Red List of Threatened Species. This status reflects its large geographical range, adaptability to agricultural and suburban development, and stable global population trends. Nonetheless, local populations face threats from rapid habitat loss due to monoculture expansion, secondary poisoning from pesticides and rodenticides, automobile collisions on highways, and targeted killings due to local superstitions that falsely associate owls with bad omens.



Compilation and publication: EcoRegistros – 25/07/2026




Geographic distribution


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Species photographs

Last published photographs

Foto
Photography ID: 69998
  Immature

Barranqueras
Chaco
Argentina
11/07/2014
David Juszczuk
Foto
Photography ID: 68610
  Adult

Barranqueras
Chaco
Argentina
11/07/2014
Héctor Schreiber
Foto
Photography ID: 68065
  Immature

Barranqueras
Chaco
Argentina
11/06/2014
Héctor Bernardo Fernández



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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
20118807/11/2014ArgentinaChacoBarranquerasDavid Juszczuk
19756207/11/2014ArgentinaChacoBarranquerasHéctor Schreiber
19592106/11/2014ArgentinaChacoBarranquerasHéctor Bernardo Fernández
Page 1

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Recommended citation
Please use the following reference when citing this species account.
EcoRegistros. 2026. Striped Owl (Asio clamator) – Species account. Accessed from www.ecoregistros.org on 14/09/2026.