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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: 344397
  Juvenile

Dique Los Alisos
Jujuy
Argentina
07/07/2019
Gustavo Arévalos
Foto
Photography ID: 335936
  Adult

Maimará
Jujuy
Argentina
06/01/2019
Gustavo Arévalos
Foto
Photography ID: 334680
  Juvenile

San Antonio
Jujuy
Argentina
03/23/2019
Gustavo Arévalos
Foto
Photography ID: 305185
  Adult

La Quiaca
Jujuy
Argentina
12/15/2018
Gustavo Arévalos
Foto
Photography ID: 290753
  Juvenile

San Antonio
Jujuy
Argentina
10/06/2018
Gustavo Arévalos
Foto
Photography ID: 279111
  Juvenile

Volcán
Jujuy
Argentina
07/07/2018
Gustavo Arévalos
Foto
Photography ID: 273503
  Adult

La Almona
Jujuy
Argentina
06/02/2018
Gustavo Arévalos
Foto
Photography ID: 273501
  Juvenile

Dique Los Alisos
Jujuy
Argentina
06/02/2018
Gustavo Arévalos
Foto
Photography ID: 273499
  Adult

Pampa Blanca
Jujuy
Argentina
06/02/2018
Gustavo Arévalos
Foto
Photography ID: 241669
  Juvenile

La Almona
Jujuy
Argentina
01/07/2018
Gustavo Arévalos
Foto
Photography ID: 216503
  Adult

Santa Catalina
Jujuy
Argentina
10/22/2016
Gustavo Arévalos



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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
95557807/07/2019ArgentinaJujuyZona Acceso Rio Los Alisos, Dique Los AlisosGustavo Arévalos
93087501/06/2019ArgentinaJujuyMaimaráGustavo Arévalos
93086018/05/2019ArgentinaJujuyRuta Provincial 6 entre Santa Clara y El FuerteGustavo Arévalos
92720723/03/2019ArgentinaJujuySan AntonioGustavo Arévalos
85620715/12/2018ArgentinaJujuyRuta 9 , 1 km. antes de la quiaca, La QuiacaGustavo Arévalos
82521706/10/2018ArgentinaJujuySan AntonioGustavo Arévalos
78694007/07/2018ArgentinaJujuyCuesta de Bárcena, VolcánGustavo Arévalos
77419302/06/2018ArgentinaJujuyLa AlmonaGustavo Arévalos
77419202/06/2018ArgentinaJujuyZona Acceso Rio Los Alisos, Dique Los AlisosGustavo Arévalos
77419102/06/2018ArgentinaJujuyPampa BlancaGustavo Arévalos
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 18/03/2026.