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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: 666229
  Adult

Las Grutas
Río Negro
Argentina
10/05/2025
Gustavo Abel Larracoechea
Foto
Photography ID: 660420
  Adult

Nicolás Levalle
Buenos Aires
Argentina
08/23/2025
Gustavo Abel Larracoechea
Foto
Photography ID: 338661
  Immature

Caviahue
Neuquén
Argentina
01/30/2019
Gustavo Abel Larracoechea
Foto
Photography ID: 338659
♂ ♀
  Adult

Punta Alta
Buenos Aires
Argentina
07/09/2014
Gustavo Abel Larracoechea
Foto
Photography ID: 20332
  Juvenile

Pehuen-Có
Buenos Aires
Argentina
04/14/2012
Gustavo Abel Larracoechea



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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
241140705/10/2025ArgentinaRío NegroCamino a Piedras Coloradas, Las GrutasGustavo Abel Larracoechea
238859523/08/2025ArgentinaBuenos AiresCamino a Chapalcó, Nicolás LevalleGustavo Abel Larracoechea
238798301/08/2025ArgentinaBuenos AiresCamino corto Pehuen Co, Partido de Coronel RosalesGustavo Abel Larracoechea
238798212/11/2024ArgentinaSan LuisCamino hacia los miradores, Parque Nacional Sierra de las QuijadasGustavo Abel Larracoechea
238798129/09/2024ArgentinaBuenos AiresEx Ruta Nacional 3, Partido de Coronel RosalesGustavo Abel Larracoechea
203861413/04/2024ArgentinaBuenos AiresCamino de los lecheros, Partido de Coronel RosalesGustavo Abel Larracoechea
93645130/01/2019ArgentinaNeuquénCamino Caviahue-copahue, CaviahueGustavo Abel Larracoechea
93644909/07/2014ArgentinaBuenos AiresRuta 249, Punta AltaGustavo Abel Larracoechea
5454814/04/2012ArgentinaBuenos AiresSobre ruta de acceso a la villa, Pehuen-CóGustavo Abel Larracoechea
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 29/03/2026.