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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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Latest feeding records
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Last published photographs

Foto
Photography ID: 625813
  Immature

Fiambálá
Catamarca
Argentina
03/01/2025
Jorge Schlemmer
Foto
Photography ID: 625812
  Immature

Fiambálá
Catamarca
Argentina
03/01/2025
Jorge Schlemmer
Foto
Photography ID: 537235
  Adult

Camino a Characato
Córdoba
Argentina
05/20/2023
Jorge Schlemmer
Foto
Photography ID: 536760
  Immature

Parque Nacional El Rey
Salta
Argentina
05/26/2023
Jorge Schlemmer
Foto
Photography ID: 526314
  Adult

Parque Nacional los Cardones
Salta
Argentina
02/20/2023
Jorge Schlemmer
Foto
Photography ID: 526313
  Adult

Parque Nacional los Cardones
Salta
Argentina
02/20/2023
Jorge Schlemmer
Foto
Photography ID: 441324
  Juvenile

Abra Pampa
Jujuy
Argentina
03/08/2021
Jorge Schlemmer
Foto
Photography ID: 441323
  Adult

Abra Pampa
Jujuy
Argentina
03/08/2021
Jorge Schlemmer
Foto
Photography ID: 441209
  Juvenile

Salta
Salta
Argentina
03/06/2021
Jorge Schlemmer



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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
226179801/03/2025ArgentinaCatamarcaFiambáláJorge Schlemmer
202335813/04/2024ArgentinaBuenos AiresArroyo Chasicó, partido de TornquistJorge Schlemmer
192017204/11/2023ArgentinaJujuyCamino De Los Morteros, Ruta Provincial 6, Jujuy, Ar1Jorge Schlemmer
181329619/08/2023ArgentinaCórdobaParque Nacional Quebrada del CondoritoJorge Schlemmer
177456126/05/2023ArgentinaSaltaParque Nacional El ReyJorge Schlemmer
177580920/05/2023ArgentinaCórdobaCamino a CharacatoJorge Schlemmer
182047908/03/2023ArgentinaNeuquénRepresa Alicurá1Jorge Schlemmer
182042606/03/2023ArgentinaRío NegroArroyo Gutiérrez, San Carlos de Bariloche1Jorge Schlemmer
172967820/02/2023ArgentinaSaltaParque Nacional los CardonesJorge Schlemmer
148392709/10/2021ArgentinaTucumánReserva Natural Estricta Quebrada del PortuguésJorge Schlemmer
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 11/04/2026.