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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 Villa Pehuenia

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: 484151
  Juvenile

Villa Pehuenia
Neuquén
Argentina
02/05/2022
Gustavo Daniel González
Foto
Photography ID: 484149
  Juvenile

Villa Pehuenia
Neuquén
Argentina
02/05/2022
Gustavo Daniel González
Foto
Photography ID: 484148
  Juvenile

Villa Pehuenia
Neuquén
Argentina
02/05/2022
Gustavo Daniel González
Foto
Photography ID: 484085
  Adult

Villa Pehuenia
Neuquén
Argentina
02/01/2022
Diego Alfonso Rosa
Foto
Photography ID: 392286
  Juvenile

Villa Pehuenia
Neuquén
Argentina
02/28/2016
Santos Di Mauro
Foto
Photography ID: 241128
  Adult

Villa Pehuenia
Neuquén
Argentina
01/18/2018
Alicia Miller



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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
155216605/02/2022ArgentinaNeuquénRío Litran, Villa PehueniaGustavo Daniel González
155201801/02/2022ArgentinaNeuquénPunta Negra, Villa PehueniaDiego Alfonso Rosa
137025006/02/2021ArgentinaNeuquénVolcán Batea Mahuida, Villa PehueniaVictor Hugo Michelini
70856604/02/2018ArgentinaNeuquénVolcán Batea Mahuida, Villa PehueniaPablo Eguia
67791718/01/2018ArgentinaNeuquénVolcán Batea Mahuida, Villa PehueniaAlicia Miller
64135501/11/2017ArgentinaNeuquénVilla Pehuenia, Villa Pehuenia1Edgar Romeo
55344013/02/2017ArgentinaNeuquénVilla Pehuenia1Julian Garcia
105957321/05/2016ArgentinaNeuquénVilla PehueniaJulian Quillen Vidoz
123239028/02/2016ArgentinaNeuquénVilla PehueniaSantos Di Mauro
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.