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Variable Hawk

Geranoaetus polyosoma
(Quoy, JRC; Gaimard, JP, 1824)
Aguilucho Común
Gavião-de-costas-vermelhas

Family: Accipitridae
Order: Accipitriformes
Class: Aves
Phylum / Division: Chordata
Kingdom: Animalia

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Conservation status according to BirdLife International: Least Concern

Other common names: Ñanco, Aguilucho Variable.

Synonyms: Buteo polyosoma, Falco polyosoma.

Subspecies:


Description: It is a large, long-winged raptor with a slender profile and remarkable plumage variability. Individuals range from mostly ash-gray to rufous or chestnut tones, with lighter or darker underparts depending on morph. In flight, it is recognized by its slightly raised wings forming a shallow “V”, relatively short tail, and pale patches at the base of the primaries. Juveniles tend to be browner and more streaked.

Geographic distribution: It is widely distributed across South America, from southern Colombia and Venezuela to southernmost Chile and Argentina. It is especially common along the Andes, but also inhabits Patagonian steppes, intermontane valleys, and open lowlands.

Habitat: It occupies open and semi-open habitats, including grasslands, shrublands, agricultural areas, and mountainous regions. It tolerates a broad altitudinal range, from sea level to over 4,000 m, efficiently using thermal currents for soaring.

Diet: It is an opportunistic predator, feeding mainly on small mammals (particularly rodents), medium-sized birds, reptiles, and large insects. It also scavenges when opportunities arise, which increases its dietary flexibility.

Behavior: Usually seen alone or in pairs, though it may gather where food is abundant. It spends long periods soaring with a powerful yet economical flight, and maintains large territories during the breeding season.

Nesting: It builds large stick nests, typically on rocky cliffs, escarpments, or occasionally tall trees and human-made structures. Clutches usually consist of one to two eggs, with shared parental care and an extended fledging period.

Conservation status: It is classified as Least Concern globally due to its wide range and generally stable populations, although local threats include persecution, electrocution, and habitat alteration.


Author of this compilation: EcoRegistros – 15/12/2025




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Last published photographs

Foto
Photography ID: 545568
  Juvenile

Altas cumbres
Córdoba
Argentina
08/19/2023
Nino A. Grangetto
Foto
Photography ID: 501543
  Adult

Camino Altas Cumbres
Córdoba
Argentina
07/23/2022
Nino A. Grangetto
Foto
Photography ID: 435646
  Adult

Camino Altas Cumbres
Córdoba
Argentina
02/27/2021
Nino A. Grangetto
Foto
Photography ID: 425556
  Squab

Camino Altas Cumbres
Córdoba
Argentina
01/20/2020
Nino A. Grangetto
Foto
Photography ID: 425555
  Adult

Camino Altas Cumbres
Córdoba
Argentina
01/18/2020
Nino A. Grangetto



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 Reports


 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
213883931/08/2024ArgentinaCórdobaCamino a Paso de Piedra, Altas cumbres2Nino A. Grangetto
191856504/11/2023ArgentinaJujuyCamino De Los Morteros, Ruta Provincial 6, Jujuy, Ar1Nino A. Grangetto
181433019/08/2023ArgentinaCórdobaPampa de achala, Altas cumbresNino A. Grangetto
180963712/08/2023ArgentinaCórdobaVieja ruta 14 entre Cóndor y CopinaNino A. Grangetto
161500623/07/2022ArgentinaCórdobaCercanía Parque Nacional Quebrada del Condorito, Camino Altas CumbresNino A. Grangetto
137457027/02/2021ArgentinaCórdobaquebrada de batan, Camino Altas CumbresNino A. Grangetto
133594720/01/2020ArgentinaCórdobaCamino Altas CumbresNino A. Grangetto
133594618/01/2020ArgentinaCórdobaCamino Altas CumbresNino A. Grangetto
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 29/03/2026.