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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: 589152
 
El Infiernillo
Tucumán
Argentina
08/08/2018
Adrian Braidotti
Foto
Photography ID: 589151
 
Caviahue
Neuquén
Argentina
04/05/2024
Adrian Braidotti
Foto
Photography ID: 589150
 
Malargüe
Mendoza
Argentina
07/18/2013
Adrian Braidotti
Foto
Photography ID: 582956
 
Caviahue
Neuquén
Argentina
04/05/2024
Adrian Braidotti
Foto
Photography ID: 582951
 
Caviahue
Neuquén
Argentina
04/05/2024
Adrian Braidotti
Foto
Photography ID: 582949
 
Esquel
Chubut
Argentina
04/13/2024
Adrian Braidotti
Foto
Photography ID: 457155
 
Quines
San Luis
Argentina
08/01/2021
Adrian Braidotti
Foto
Photography ID: 346118
  Adult

Tres Cruces
Jujuy
Argentina
08/07/2019
Adrian Braidotti
Foto
Photography ID: 282087
 
Yavi
Jujuy
Argentina
08/04/2018
Adrian Braidotti
Foto
Photography ID: 281910
 
El Infiernillo
Tucumán
Argentina
08/08/2018
Adrian Braidotti



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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
232531016/07/2025ArgentinaCórdobaSendero Capilla San Placido hasta el Cerro Pantanitos, Bialet MasseAdrian Braidotti
214220924/08/2024ArgentinaCórdobaPuente sobre el río Yuspe, Los GigantesAdrian Braidotti
214134419/08/2024ArgentinaCatamarcaFuerte QuemadoAdrian Braidotti
214132419/08/2024ArgentinaTucumánColalao del ValleAdrian Braidotti
203084318/04/2024ArgentinaRío NegroAcceso a San Antonio EsteAdrian Braidotti
203065215/04/2024ArgentinaChubutTeckaAdrian Braidotti
203130113/04/2024ArgentinaChubutReserva Natural Urbana Laguna La Zeta, EsquelAdrian Braidotti
203014206/04/2024ArgentinaNeuquénJunín de los Andes, Junin de los AndesAdrian Braidotti
203009206/04/2024ArgentinaNeuquénPino HachadoAdrian Braidotti
202999005/04/2024ArgentinaNeuquénSendero a Puente de Piedra, CaviahueAdrian Braidotti
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.