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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 Aconquija (Las Estancias)

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: 520838
  Juvenile

Aconquija (Las Estancias)
Catamarca
Argentina
01/12/2023
Miguel Andina
Foto
Photography ID: 375551
  Immature

Aconquija (Las Estancias)
Catamarca
Argentina
01/12/2020
Miguel Andina
Foto
Photography ID: 314511
  Juvenile

Aconquija (Las Estancias)
Catamarca
Argentina
01/28/2019
Miguel Andina
Foto
Photography ID: 314510
  Juvenile

Aconquija (Las Estancias)
Catamarca
Argentina
01/28/2019
Miguel Andina
Foto
Photography ID: 196272
  Juvenile

Aconquija (Las Estancias)
Catamarca
Argentina
03/25/2017
Miguel Andina
Foto
Photography ID: 185654
  Adult

Aconquija (Las Estancias)
Catamarca
Argentina
01/19/2017
Miguel Andina
Foto
Photography ID: 185215
  Juvenile

Aconquija (Las Estancias)
Catamarca
Argentina
01/14/2017
Miguel Andina
Foto
Photography ID: 185214
  Juvenile

Aconquija (Las Estancias)
Catamarca
Argentina
01/14/2017
Miguel Andina
Foto
Photography ID: 80151
  Immature

Aconquija (Las Estancias)
Catamarca
Argentina
01/26/2015
Miguel Andina
Foto
Photography ID: 67555
  Juvenile

Aconquija (Las Estancias)
Catamarca
Argentina
10/30/2014
Miguel Andina
Foto
Photography ID: 63886
  Juvenile

Aconquija (Las Estancias)
Catamarca
Argentina
10/05/2014
Miguel Andina



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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
170130412/01/2023ArgentinaCatamarcaAconquija (Las Estancias)Miguel Andina
157667027/03/2022ArgentinaCatamarcaRío Potrero, Aconquija (Las Estancias)Nancy Regio
157628727/03/2022ArgentinaCatamarcaRío Potrero, Aconquija (Las Estancias)Victor Hugo Michelini
117199512/01/2020ArgentinaCatamarcaCampo del pucara, Aconquija (Las Estancias)Miguel Andina
88161628/01/2019ArgentinaCatamarcaCampo del pucara, Aconquija (Las Estancias)Miguel Andina
55833625/03/2017ArgentinaCatamarcaAconquija (Las Estancias)Miguel Andina
53014419/01/2017ArgentinaCatamarcaCampo del pucara, Aconquija (Las Estancias)Miguel Andina
52855614/01/2017ArgentinaCatamarcaCampo del pucara, Aconquija (Las Estancias)Miguel Andina
23430226/01/2015ArgentinaCatamarcaPucará, Aconquija (Las Estancias)Miguel Andina
19443130/10/2014ArgentinaCatamarcaPucará, Aconquija (Las Estancias)Miguel Andina
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.