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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: 317016
  Adult

El Infiernillo
Tucumán
Argentina
05/06/2015
Santos Di Mauro
Foto
Photography ID: 234776
  Adult

Ruta 3 km 1890
Santa Cruz
Argentina
05/30/2015
Zulima América Schupbach
Foto
Photography ID: 209459
  Adult

Bowen
Mendoza
Argentina
04/21/2015
Feliciano Ferretti
Foto
Photography ID: 209111
  Adult

Cachi
Salta
Argentina
06/23/2015
Rodolfo Capdevielle
Foto
Photography ID: 209110
  Adult

Cachi
Salta
Argentina
06/23/2015
Rodolfo Capdevielle
Foto
Photography ID: 208988
 
Maimará
Jujuy
Argentina
06/21/2015
Rodolfo Capdevielle



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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
231298830/12/2015ArgentinaRío NegroRuta 251 entre General Conesa y San Antonio OesteFernando Rasmussen
38254429/12/2015ArgentinaCórdobaCura BrocheroSebastián Dardanelli
38249029/12/2015ArgentinaCórdobaCamino de los TúnelesSebastián Dardanelli
105950326/12/2015ArgentinaChubutLago Mosquito, CushamenJulian Quillen Vidoz
37781923/12/2015ArgentinaSanta CruzPuerto DeseadoRicardo Juliano
37744612/12/2015ArgentinaLa PampaCamino hacia el Valle de Los Angelitos, Parque Nacional Lihué CalelFernando Alberto Segura
38180211/12/2015ArgentinaLa PampaParque Nacional Lihué CalelFernando Alberto Segura
37622808/12/2015ArgentinaSanta CruzParque Nacional PatagoniaLaura Dodyk
105951007/12/2015ArgentinaChubutCamarones, Florentino AmeghinoJulian Quillen Vidoz
105952306/12/2015ArgentinaChubutLaguna Negra, RawsonJulian Quillen Vidoz
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 17/03/2026.