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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: 485192
  Adult

Rp 5
Jujuy
Argentina
11/03/2021
Luis Cesar Tejo
Foto
Photography ID: 338753
  Adult

Puerto Santa Cruz
Santa Cruz
Argentina
01/13/2019
Luis Cesar Tejo
Foto
Photography ID: 241932
  Adult

Ruta 188
San Luis
Argentina
03/17/2007
Luis Cesar Tejo



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 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
221244609/12/2024ArgentinaSaltaCuesta del Obispo1Luis Cesar Tejo
221234107/12/2024ArgentinaSaltaCachipampa, Parque Nacional los Cardones1Luis Cesar Tejo
149711804/11/2021ArgentinaJujuyLaguna del Huancar, Abra Pampa1Luis Cesar Tejo
149708403/11/2021ArgentinaJujuyRp 51Luis Cesar Tejo
149705002/11/2021ArgentinaJujuyMonumento Natural Laguna de los Pozuelos1Luis Cesar Tejo
149703501/11/2021ArgentinaJujuyAbra Pampa2Luis Cesar Tejo
151690825/01/2019ArgentinaChubutSalinas Chicas, Área Natural Protegida Península Valdés1Luis Cesar Tejo
151688323/01/2019ArgentinaChubutÁrea Natural Protegida Punta Tombo2Luis Cesar Tejo
151684118/01/2019ArgentinaSanta CruzRia Puerto Deseado, Puerto Deseado1Luis Cesar Tejo
151683016/01/2019ArgentinaSanta CruzTres Cerros, Ruta Nacional 3Luis Cesar Tejo
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 25/03/2026.