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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: 592032
  Adult

Entre Rucanelo y La Maruja
La Pampa
Argentina
07/13/2024
Alicia Mayor
Foto
Photography ID: 401312
  Adult

Jaguel del Monte
La Pampa
Argentina
05/15/2020
Alicia Mayor
Foto
Photography ID: 343245
  Adult

Cercanías a Rucanelo
La Pampa
Argentina
07/20/2019
Alicia Mayor
Foto
Photography ID: 339236
  Adult

Entre Luan Toro y Rucanelo
La Pampa
Argentina
06/02/2019
Alicia Mayor
Foto
Photography ID: 282310
  Adult

En cercania a Conhelo
La Pampa
Argentina
08/19/2018
Alicia Mayor
Foto
Photography ID: 212689
  Adult

Rucanelo
La Pampa
Argentina
07/30/2017
Alicia Mayor
Foto
Photography ID: 198914
  Adult

Cercanías a Rucanelo
La Pampa
Argentina
04/09/2017
Alicia Mayor
Foto
Photography ID: 144840
  Adult

Jaguel del Monte
La Pampa
Argentina
03/24/2016
Alicia Mayor
Foto
Photography ID: 103033
  Juvenile

Villa Mirasol
La Pampa
Argentina
06/21/2015
Alicia Mayor



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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
211464913/07/2024ArgentinaLa PampaEntre Rucanelo y La MarujaAlicia Mayor
126424015/05/2020ArgentinaLa PampaMayaco, Jaguel del MonteAlicia Mayor
95174620/07/2019ArgentinaLa PampaCercanías a RucaneloAlicia Mayor
93848502/06/2019ArgentinaLa PampaEntre Luan Toro y RucaneloAlicia Mayor
79500419/08/2018ArgentinaLa PampaEn cercania a ConheloAlicia Mayor
59936606/08/2017ArgentinaLa PampaCalle vecinal cerca de Eduardo CastexAlicia Mayor
59730830/07/2017ArgentinaLa PampaRucaneloAlicia Mayor
56562809/04/2017ArgentinaLa PampaCercanías a RucaneloAlicia Mayor
42013424/03/2016ArgentinaLa PampaMayaco, Jaguel del Monte6Alicia Mayor
29702821/06/2015ArgentinaLa PampaRuta 7, Villa MirasolAlicia Mayor
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.