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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: 263779
  Immature

Larcas
Jujuy
Argentina
05/09/2018
Luis Fernandez Campos
Foto
Photography ID: 262236
  Immature

Parque Provincial Potrero de Yala
Jujuy
Argentina
04/27/2018
Luis Fernandez Campos
Foto
Photography ID: 260910
  Adult

Palpalá
Jujuy
Argentina
04/19/2018
Luis Fernandez Campos
Foto
Photography ID: 209402
  Adult

Tres Cruces
Jujuy
Argentina
07/06/2017
Luis Fernandez Campos
Foto
Photography ID: 209346
  Adult

Yavi
Jujuy
Argentina
07/06/2017
Luis Fernandez Campos
Foto
Photography ID: 208243
  Adult

Caimancito
Jujuy
Argentina
06/27/2017
Luis Fernandez Campos
Foto
Photography ID: 205796
  Adult

Maimará
Jujuy
Argentina
05/20/2017
Luis Fernandez Campos
Foto
Photography ID: 205795
  Immature

Capital - Finca Cuyaya
Jujuy
Argentina
05/21/2017
Luis Fernandez Campos
Foto
Photography ID: 205794
  Immature

Capital - Finca Cuyaya
Jujuy
Argentina
05/21/2017
Luis Fernandez Campos
Foto
Photography ID: 169764
  Adult

Tres Cruces
Jujuy
Argentina
09/30/2016
Luis Fernandez Campos
Foto
Photography ID: 149858
  Adult

San Salvador de Jujuy
Jujuy
Argentina
05/14/2016
Luis Fernandez Campos



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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
132556029/11/2020ArgentinaJujuyDique Catamontaña1Luis Fernandez Campos
130156909/05/2020ArgentinaJujuySan Antonio, San Antonio1Luis Fernandez Campos
119944018/02/2020ArgentinaJujuyAbra Pampa1Luis Fernandez Campos
77371628/06/2018ArgentinaJujuyParque Provincial Potrero de Yala1Luis Fernandez Campos
75388309/05/2018ArgentinaJujuyLarcasLuis Fernandez Campos
75033627/04/2018ArgentinaJujuyLagunas de Yala, Parque Provincial Potrero de YalaLuis Fernandez Campos
74711819/04/2018ArgentinaJujuySerranias del Zapla, PalpaláLuis Fernandez Campos
74555814/04/2018ArgentinaJujuyLaguna de los Patos, Tilcara1Luis Fernandez Campos
64467217/11/2017ArgentinaJujuyVegas de Larkas1Luis Fernandez Campos
64849926/10/2017ArgentinaJujuyLagunas de Yala, Parque Provincial Potrero de Yala1Luis Fernandez Campos
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 11/04/2026.