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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: 557939
  Juvenile

Ruta 40 Norte
Jujuy
Argentina
12/18/2022
Santiago M. Carrillo
Foto
Photography ID: 214348
  Adult

Cangrejillos
Jujuy
Argentina
07/27/2017
Santiago M. Carrillo
Foto
Photography ID: 98984
  Adult

Barrancas
Jujuy
Argentina
05/15/2015
Santiago M. Carrillo
Foto
Photography ID: 93246
  Adult

San Francisco de Alfarcito
Jujuy
Argentina
03/26/2015
Santiago M. Carrillo
Foto
Photography ID: 90072
  Juvenile

Estación Laguna Seca
Salta
Argentina
03/19/2015
Santiago M. Carrillo
Foto
Photography ID: 63719
  Adult

Ruta 40 Norte
Salta
Argentina
10/02/2014
Santiago M. Carrillo
Foto
Photography ID: 25552
  Adult

La Intermedia
Jujuy
Argentina
07/22/2013
Santiago M. Carrillo



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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
192229518/12/2022ArgentinaJujuyCoranzuli, Ruta 40 NorteSantiago M. Carrillo
155679926/01/2022ArgentinaJujuyRío Cincel, Monumento Natural Laguna de los PozuelosSantiago M. Carrillo
60161227/07/2017ArgentinaJujuyCangrejillosSantiago M. Carrillo
51559529/11/2016ArgentinaJujuyLaguna por ingreso principal, Monumento Natural Laguna de los PozuelosSantiago M. Carrillo
43352102/05/2016ArgentinaJujuyRodeo, Monumento Natural Laguna de los PozuelosSantiago M. Carrillo
28546815/05/2015ArgentinaJujuyBarrancasSantiago M. Carrillo
26904126/03/2015ArgentinaJujuyRuta Provincial 11, San Francisco de AlfarcitoSantiago M. Carrillo
26053919/03/2015ArgentinaSaltaEstación Laguna Seca, Estación Laguna SecaSantiago M. Carrillo
18321702/10/2014ArgentinaSaltaRuta 40 NorteSantiago M. Carrillo
6983422/07/2013ArgentinaJujuyCangrejillos, La IntermediaSantiago M. Carrillo
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 06/04/2026.