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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 Malargüe

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: 641239
  Juvenile

Malargüe
Mendoza
Argentina
01/11/2011
Fernando Rasmussen
Foto
Photography ID: 589150
 
Malargüe
Mendoza
Argentina
07/18/2013
Adrian Braidotti
Foto
Photography ID: 574538
  Adult

Malargüe
Mendoza
Argentina
02/23/2024
Sergio Cusano
Foto
Photography ID: 574458
  Adult

Malargüe
Mendoza
Argentina
02/23/2024
Eduardo Cusano
Foto
Photography ID: 570310
  Adult

Malargüe
Mendoza
Argentina
02/10/2024
Pablo Moreno
Foto
Photography ID: 479986
  Adult

Malargüe
Mendoza
Argentina
01/06/2022
Hugo Alberto Valderrey
Foto
Photography ID: 478510
  Adult

Malargüe
Mendoza
Argentina
01/06/2022
Hugo Alberto Valderrey
Foto
Photography ID: 388579
  Adult

Malargüe
Mendoza
Argentina
02/29/2020
Sergio Cusano
Foto
Photography ID: 363074
  Immature

Malargüe
Mendoza
Argentina
01/26/2017
Daniel Osvaldo Fernández
Foto
Photography ID: 349919
  Adult

Malargüe
Mendoza
Argentina
01/09/2019
Analía Gonzalez
Foto
Photography ID: 292478
  Adult

Malargüe
Mendoza
Argentina
08/18/2018
Max Uranga
Foto
Photography ID: 292477
  Adult

Malargüe
Mendoza
Argentina
08/18/2018
Max Uranga



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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
201492217/03/2024ArgentinaMendozaZona rural, Malargüe1Hugo Caverzasi
201081510/03/2024ArgentinaMendozaCantera del stein, Malargüe2Pablo Moreno
200765123/02/2024ArgentinaMendozaMalargüeSergio Cusano
200734723/02/2024ArgentinaMendozaMalargüeEduardo Cusano
197299310/02/2024ArgentinaMendozaLas loicas, Malargüe1Pablo Moreno
190706029/10/2023ArgentinaMendozaMalargüeHernán Tolosa
177227427/05/2023ArgentinaMendozaLa pasarela, Malargüe1Pablo Moreno
177226227/05/2023ArgentinaMendozaCantera del stein, Malargüe1Pablo Moreno
167519506/11/2022ArgentinaMendozaCamino a Llancanelo, Malargüe1Pablo Moreno
167472904/11/2022ArgentinaMendozaMalargüe2Pablo Moreno
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.