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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 Salta

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: 670181
♂ ♀
  Adult

Cafayate
Salta
Argentina
01/28/2026
Viviana Fuentes
Foto
Photography ID: 651762
  Immature

Parque Nacional los Cardones
Salta
Argentina
09/02/2024
Mauro Desch
Foto
Photography ID: 651761
  Immature

Parque Nacional los Cardones
Salta
Argentina
09/02/2024
Mauro Desch
Foto
Photography ID: 651760
  Immature

Parque Nacional los Cardones
Salta
Argentina
09/02/2024
Mauro Desch
Foto
Photography ID: 650142
  Adult

Mina Concordia
Salta
Argentina
08/31/2024
Mauro Desch
Foto
Photography ID: 641711
  Immature

Salta
Salta
Argentina
07/05/2025
Nazareno Del Carlo
Foto
Photography ID: 639323
 
Cachi
Salta
Argentina
06/10/2021
Gustavo Marasco
Foto
Photography ID: 639321
  Juvenile

Cachi
Salta
Argentina
06/10/2021
Gustavo Marasco
Foto
Photography ID: 636189
  Juvenile

Parque Nacional los Cardones
Salta
Argentina
05/13/2025
Dolores Fernandez
Foto
Photography ID: 621922
  Juvenile

Rosario de Lerma
Salta
Argentina
08/27/2024
Franco Montaño Herrero
Foto
Photography ID: 616333
  Adult

Ruta 33
Salta
Argentina
11/23/2024
Federico J. Villegas
Foto
Photography ID: 616332
  Adult

Ruta 33
Salta
Argentina
11/23/2024
Federico J. Villegas



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Last Vocalizations published



Audio playerUserDateCountryProvincePlaceSexLife stageIt was observedDetails
Diego Oscar07/31/2024ArgentinaSaltaValle de LermaN/AN/AYesNo



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Last Filmings published




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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
242411228/01/2026ArgentinaSaltaCamino a San Carlos, CafayateViviana Fuentes
235893715/09/2025ArgentinaSaltaCuesta del ObispoNicolas Olejnik
235727305/09/2025ArgentinaSaltaQuebrada Lizoite, Santa Victoria2Hugo Caverzasi
235729104/09/2025ArgentinaSaltaRuta Provincial 7 cerca de Chorro, Santa Victoria1Hugo Caverzasi
235736903/09/2025ArgentinaSaltaRuta Provincial 7 cerc de San Jose, Santa Victoria1Hugo Caverzasi
235587631/08/2025ArgentinaSaltaParque del Bicentenario, Capital1Hugo Caverzasi
234622421/08/202510:45ArgentinaSaltaRuta Nacional 91Jorge La Grotteria
234622821/08/202511:23ArgentinaSaltaRuta Nacional 91Jorge La Grotteria
234608821/08/202511:23ArgentinaSaltaRuta Nacional 91María Alejandra Sosa
234608421/08/202510:45ArgentinaSaltaRuta Nacional 91María Alejandra Sosa
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 22/03/2026.