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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 Parque Nacional los Cardones

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: 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: 636189
  Juvenile

Parque Nacional los Cardones
Salta
Argentina
05/13/2025
Dolores Fernandez
Foto
Photography ID: 558901
  Adult

Parque Nacional los Cardones
Salta
Argentina
11/27/2023
Pablo Alberto Re
Foto
Photography ID: 558900
  Adult

Parque Nacional los Cardones
Salta
Argentina
11/27/2023
Pablo Alberto Re
Foto
Photography ID: 544811
  Adult

Parque Nacional los Cardones
Salta
Argentina
07/13/2023
Walter Bustamante
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: 386473
  Adult

Parque Nacional los Cardones
Salta
Argentina
01/22/2020
Juan Manuel Canepa
Foto
Photography ID: 217217
  Adult

Parque Nacional los Cardones
Salta
Argentina
08/21/2017
Claudio Mendez
Foto
Photography ID: 216219
  Adult

Parque Nacional los Cardones
Salta
Argentina
08/21/2017
Claudio Mendez



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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
229286713/05/2025ArgentinaSaltaParque Nacional los CardonesDolores Fernandez
221412407/12/2024ArgentinaSaltaCachipampa, Parque Nacional los Cardones1Nicolás Bejarano
221234107/12/2024ArgentinaSaltaCachipampa, Parque Nacional los Cardones1Luis Cesar Tejo
221153907/12/2024ArgentinaSaltaCachipampa, Parque Nacional los Cardones1Daniela Espinosa
235213202/09/2024ArgentinaSaltaValle Encantado, Parque Nacional los Cardones2Mauro Desch
192507627/11/2023ArgentinaSaltaValle Encantado, Parque Nacional los CardonesPablo Alberto Re
181149713/07/2023ArgentinaSaltaValle Encantado, Parque Nacional los CardonesWalter Bustamante
172967820/02/2023ArgentinaSaltaParque Nacional los CardonesJorge Schlemmer
149546827/10/2021ArgentinaSaltaValle Encantado, Parque Nacional los CardonesVictor Hugo Michelini
147302917/08/2021ArgentinaSaltaValle Encantado, Parque Nacional los CardonesEsteban Argerich
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 12/03/2026.