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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 Camino Altas Cumbres

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: 608788
  Adult

Camino Altas Cumbres
Córdoba
Argentina
10/26/2024
Eduardo Nadal
Foto
Photography ID: 589425
  Juvenile

Camino Altas Cumbres
Córdoba
Argentina
09/02/2017
Glauco Oliveira
Foto
Photography ID: 589424
  Juvenile

Camino Altas Cumbres
Córdoba
Argentina
09/02/2017
Glauco Oliveira
Foto
Photography ID: 589113
  Adult

Camino Altas Cumbres
Córdoba
Argentina
05/15/2024
Marcelo A Carranza
Foto
Photography ID: 533144
  Juvenile

Camino Altas Cumbres
Córdoba
Argentina
04/08/2023
Pablo Eguia
Foto
Photography ID: 501543
  Adult

Camino Altas Cumbres
Córdoba
Argentina
07/23/2022
Nino A. Grangetto
Foto
Photography ID: 439926
 
Camino Altas Cumbres
Córdoba
Argentina
04/03/2021
Ruben Zabala
Foto
Photography ID: 435805
  Adult

Camino Altas Cumbres
Córdoba
Argentina
02/24/2021
Susana Gomez
Foto
Photography ID: 435646
  Adult

Camino Altas Cumbres
Córdoba
Argentina
02/27/2021
Nino A. Grangetto
Foto
Photography ID: 425556
  Squab

Camino Altas Cumbres
Córdoba
Argentina
01/20/2020
Nino A. Grangetto
Foto
Photography ID: 425555
  Adult

Camino Altas Cumbres
Córdoba
Argentina
01/18/2020
Nino A. Grangetto
Foto
Photography ID: 419365
  Adult

Camino Altas Cumbres
Córdoba
Argentina
11/15/2020
Jorge Schlemmer



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 Reports


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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
220484117/11/2024ArgentinaCórdobaCamino Altas CumbresNicolas Olejnik
218761926/10/2024ArgentinaCórdobaCamino Altas CumbresEduardo Nadal
205086815/05/2024ArgentinaCórdobaSan clemente entre 1200 mts. y 1500 mts.snm., Camino Altas CumbresMarcelo A Carranza
191897113/10/2023ArgentinaCórdobaParador El Condor y alrededores, Camino Altas Cumbres1Enrique Chiurla
190192713/10/2023ArgentinaCórdobaParador El Condor y alrededores, Camino Altas Cumbres1Victor Hugo Michelini
175778808/04/2023ArgentinaCórdobaCercanía Parque Nacional Quebrada del Condorito, Camino Altas CumbresPablo Eguia
161500623/07/2022ArgentinaCórdobaCercanía Parque Nacional Quebrada del Condorito, Camino Altas CumbresNino A. Grangetto
139189703/04/2021ArgentinaCórdobaPampa de Achala, Camino Altas CumbresRuben Zabala
137457027/02/2021ArgentinaCórdobaquebrada de batan, Camino Altas CumbresNino A. Grangetto
137497624/02/2021ArgentinaCórdobaPampa de Achala, Camino Altas CumbresSusana Gomez
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 13/03/2026.