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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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Records from Yavi

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: 663036
  Adult

Yavi
Jujuy
Argentina
11/13/2025
Federico J. Villegas
Foto
Photography ID: 589862
  Adult

Yavi
Jujuy
Argentina
06/22/2024
Pablo Alberto Re
Foto
Photography ID: 582066
 
Yavi
Jujuy
Argentina
03/05/2024
Victor Hugo Michelini
Foto
Photography ID: 307441
  Adult

Yavi
Jujuy
Argentina
09/24/2018
Elsa Longo
Foto
Photography ID: 307025
  Adult

Yavi
Jujuy
Argentina
09/24/2018
Guillermo Marcaida
Foto
Photography ID: 282087
 
Yavi
Jujuy
Argentina
08/04/2018
Adrian Braidotti
Foto
Photography ID: 260093
  Adult

Yavi
Jujuy
Argentina
04/13/2018
Miguel Andina
Foto
Photography ID: 209346
  Adult

Yavi
Jujuy
Argentina
07/06/2017
Luis Fernandez Campos
Foto
Photography ID: 136483
 

Yavi
Jujuy
Argentina
01/17/2016
Mauricio Secchi
Foto
Photography ID: 67588
  Immature

Yavi
Jujuy
Argentina
10/13/2014
Alec Earnshaw
Foto
Photography ID: 61653
  Adult

Yavi
Jujuy
Argentina
08/17/2014
Gerardo Alberto García
Foto
Photography ID: 57014
  Adult

Yavi
Jujuy
Argentina
07/17/2014
Adrian Braidotti



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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
239981913/11/2025ArgentinaJujuyYaviFederico J. Villegas
235739102/09/2025ArgentinaJujuyIglesia de Yavi, Yavi2Hugo Caverzasi
234514919/08/202516:31ArgentinaJujuyAvenida de las Carretas, Yavi1Jorge La Grotteria
234511019/08/202516:31ArgentinaJujuyAvenida de las Carretas, Yavi1María Alejandra Sosa
213189808/08/2024ArgentinaJujuyYavi1Diego Oscar
205196322/06/2024ArgentinaJujuyYaviPablo Alberto Re
202784505/03/2024ArgentinaJujuyYavi4Victor Hugo Michelini
177564406/06/2023ArgentinaJujuyYavi2Marcelo Gavensky
117069916/01/2020ArgentinaJujuyAvenida General Güemes, YaviMarcelo Gavensky
97103911/09/2019ArgentinaJujuyAvenida General Güemes, YaviSantiago Juan Torres
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 12/03/2026.