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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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Records from Altas cumbres

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: 547184
  Juvenile

Altas cumbres
Córdoba
Argentina
08/19/2023
Pablo Eguia
Foto
Photography ID: 545568
  Juvenile

Altas cumbres
Córdoba
Argentina
08/19/2023
Nino A. Grangetto
Foto
Photography ID: 504464
 
Altas cumbres
Córdoba
Argentina
08/14/2022
Pablo Alberto Re
Foto
Photography ID: 504463
  Adult

Altas cumbres
Córdoba
Argentina
08/14/2022
Pablo Alberto Re
Foto
Photography ID: 488834
  Adult

Altas cumbres
Córdoba
Argentina
03/25/2022
Eduardo Cusano
Foto
Photography ID: 488740
  Adult

Altas cumbres
Córdoba
Argentina
03/24/2022
Eduardo Cusano
Foto
Photography ID: 477380
  Adult

Altas cumbres
Córdoba
Argentina
04/03/2021
Marcelo A Carranza
Foto
Photography ID: 135360
  Adult

Altas cumbres
Córdoba
Argentina
01/14/2016
Eduardo Soriano
Foto
Photography ID: 47020
  Adult

Altas cumbres
Córdoba
Argentina
03/23/2014
German Eduardo Prancetti



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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
244318606/03/2026ArgentinaCórdobaLagunas Rp34, Altas cumbres1Hugo Caverzasi
244316206/03/2026ArgentinaCórdobaCamino a Paso de Piedra, Altas cumbres1Hugo Caverzasi
232189418/07/2025ArgentinaCórdobaCamino de La Posta, Altas cumbres3Juan Bautista Cerminato Granadé
231562806/07/202518:05ArgentinaCórdobaGullio Césare, Altas cumbres2Juan Bautista Cerminato Granadé
213883931/08/2024ArgentinaCórdobaCamino a Paso de Piedra, Altas cumbres2Nino A. Grangetto
197467517/02/2024ArgentinaCórdobaEl condor, Altas cumbres1Hugo Caverzasi
182217919/08/2023ArgentinaCórdobaPampa de achala, Altas cumbresPablo Eguia
181433019/08/2023ArgentinaCórdobaPampa de achala, Altas cumbresNino A. Grangetto
177192628/05/2023ArgentinaCórdobaEl condor, Altas cumbres2Dario Juan Wendeler
162780414/08/2022ArgentinaCórdobaEl condor, Altas cumbresPablo Alberto Re
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 14/03/2026.