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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: 645054
  Adult

Camino a Farellones
Región Metropolitana
Chile
07/14/2025
Diego Oscar
Foto
Photography ID: 605026
 
Valle de Lerma
Salta
Argentina
07/31/2024
Diego Oscar
Foto
Photography ID: 605025
 
Valle de Lerma
Salta
Argentina
07/31/2024
Diego Oscar
Foto
Photography ID: 605024
 
Valle de Lerma
Salta
Argentina
07/31/2024
Diego Oscar
Foto
Photography ID: 11747
  Adult

Laguna Llancanelo
Mendoza
Argentina
02/14/2012
Diego Oscar
Foto
Photography ID: 7537
  Adult

Reserva Provincial Los Sosa
Tucumán
Argentina
06/17/2011
Diego Oscar
Foto
Photography ID: 6531
  Juvenile

Camino Altas Cumbres
Córdoba
Argentina
04/22/2011
Diego Oscar



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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
239996815/12/2025ArgentinaMendozaParque Provincial Cordón del Plata, Lujan de Cuyo1Diego Oscar
232675514/07/2025ChileRegión MetropolitanaCamino a Valle Nevado (entre Farellones y Valle Nevado)2Diego Oscar
232675314/07/2025ChileRegión MetropolitanaCamino a Farellones1Diego Oscar
215641913/09/2024ArgentinaCórdobaVieja Ruta Provincial 14, Córdoba, Ar1Diego Oscar
215639513/09/2024ArgentinaCórdobaLas vertientes, Ruta antigua altas cumbre1Diego Oscar
213194808/08/2024ArgentinaJujuyLaguna de Huancar1Diego Oscar
213192208/08/2024ArgentinaJujuyAbra de Lizoite4Diego Oscar
213189808/08/2024ArgentinaJujuyYavi1Diego Oscar
213187807/08/2024ArgentinaJujuyRuta Provincial 7, Jujuy, Ar2Diego Oscar
213163307/08/2024ArgentinaJujuyRuta Nacional 9, Jujuy, Ar1Diego Oscar
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 23/03/2026.