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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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Last published photographs

Foto
Photography ID: 589862
  Adult

Yavi
Jujuy
Argentina
06/22/2024
Pablo Alberto Re
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: 518052
  Adult

Ruta 65
Catamarca
Argentina
12/09/2022
Pablo Alberto Re
Foto
Photography ID: 504464
 
Altas cumbres
Córdoba
Argentina
08/14/2022
Pablo Alberto Re
Foto
Photography ID: 504463
  Adult

Altas cumbres
Córdoba
Argentina
08/14/2022
Pablo Alberto Re
Foto
Photography ID: 484476
  Adult

Camino a Laguna Brava
La Rioja
Argentina
02/28/2022
Pablo Alberto Re
Foto
Photography ID: 432585
  Adult

San Luis
San Luis
Argentina
01/22/2021
Pablo Alberto Re
Foto
Photography ID: 405738
  Adult

Santa Clara de Buena Vista
Santa Fe
Argentina
07/26/2020
Pablo Alberto Re



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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
205196322/06/2024ArgentinaJujuyYaviPablo Alberto Re
192507627/11/2023ArgentinaSaltaValle Encantado, Parque Nacional los CardonesPablo Alberto Re
174286423/03/2023ArgentinaJujuyRp73, entre Humahuaca y HornocalPablo Alberto Re
168884309/12/2022ArgentinaCatamarcaCuesta del clavillo del lado de Catamarca, Ruta 65Pablo Alberto Re
162780414/08/2022ArgentinaCórdobaEl condor, Altas cumbresPablo Alberto Re
155368128/02/2022ArgentinaLa RiojaCamino a Laguna BravaPablo Alberto Re
150470019/11/2021ArgentinaSan LuisÁrea Natural Protegida Quebracho de la LeguaPablo Alberto Re
138663308/03/2021ArgentinaJujuyMonumento Natural Laguna de los PozuelosPablo Alberto Re
136590022/01/2021ArgentinaSan LuisSan LuisPablo Alberto Re
127599326/07/2020ArgentinaSanta FeRuta a la 19, Santa Clara de Buena VistaPablo Alberto Re
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 10/04/2026.