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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: 257966
  Adult

Camino a Iruya
Salta
Argentina
04/01/2018
Jorge Omar Lanza
Foto
Photography ID: 161387
  Juvenile

La Esquina, Camping del Morro
San Luis
Argentina
08/07/2016
Jorge Omar Lanza
Foto
Photography ID: 49570
  Adult

San Francisco
Jujuy
Argentina
04/21/2014
Jorge Omar Lanza
Foto
Photography ID: 41987
  Adult

San José del Morro
San Luis
Argentina
03/02/2014
Jorge Omar Lanza
Foto
Photography ID: 27516
  Adult

Sierras de los Comechingones
San Luis
Argentina
09/28/2013
Jorge Omar Lanza
Foto
Photography ID: 27514
  Juvenile

Sierras de los Comechingones
San Luis
Argentina
09/28/2013
Jorge Omar Lanza
Foto
Photography ID: 27513
  Juvenile

Sierras de los Comechingones
San Luis
Argentina
09/28/2013
Jorge Omar Lanza



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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
72248601/04/2018ArgentinaSaltaCamino a IruyaJorge Omar Lanza
46222607/08/2016ArgentinaSan LuisLa Esquina, Camping del MorroJorge Omar Lanza
14039921/04/2014ArgentinaJujuySan FranciscoJorge Omar Lanza
12024302/03/2014ArgentinaSan LuisSan José del MorroJorge Omar Lanza
7433228/09/2013ArgentinaSan LuisSierras de los ComechingonesJorge Omar Lanza
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.