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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: 678307
  Adult

Parque Nacional Laguna Blanca
Neuquén
Argentina
02/13/2026
Elsa Longo
Foto
Photography ID: 646593
  Adult

Sierras de los Comechingones
San Luis
Argentina
06/04/2025
Elsa Longo
Foto
Photography ID: 630448
  Adult

Puerto San Julián
Santa Cruz
Argentina
02/04/2025
Elsa Longo
Foto
Photography ID: 616408
 
El Infiernillo
Tucumán
Argentina
10/27/2024
Elsa Longo
Foto
Photography ID: 588480
  Adult

Merlo
San Luis
Argentina
05/19/2024
Elsa Longo
Foto
Photography ID: 517395
  Juvenile

El Infiernillo
Tucumán
Argentina
09/19/2022
Elsa Longo
Foto
Photography ID: 484415
  Adult

Las Grutas
Río Negro
Argentina
11/29/2021
Elsa Longo
Foto
Photography ID: 464532
 
Villa de Merlo
San Luis
Argentina
09/04/2021
Elsa Longo
Foto
Photography ID: 308655
  Immature

Parque Nacional Talampaya
La Rioja
Argentina
11/17/2018
Elsa Longo



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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
244838113/02/2026ArgentinaNeuquénParque Nacional Laguna BlancaElsa Longo
234820907/07/202512:58ArgentinaTucumánRuta Provincial 357Elsa Longo
233391904/06/2025ArgentinaSan LuisEl filo, Sierras de los ComechingonesElsa Longo
227324704/02/2025ArgentinaSanta CruzCircuito costero, Puerto San JuliánElsa Longo
222667527/10/2024ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El InfiernilloElsa Longo
204848019/05/2024ArgentinaSan LuisFilo, MerloElsa Longo
189908629/08/2023ArgentinaCórdobaVilla María de Río SecoElsa Longo
189906228/08/2023ArgentinaTucumánRuta 307 entre El Infiernillo y Amaicha del ValleElsa Longo
189749425/08/2023ArgentinaTucumánRuta 307 entre El Infiernillo y Amaicha del Valle, Tafí del ValleElsa Longo
174865502/03/2023ArgentinaNeuquénCaviahueElsa Longo
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 26/03/2026.