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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: 628537
  Adult

Villa Unión
La Rioja
Argentina
02/26/2025
Alec Earnshaw
Foto
Photography ID: 628536
 
Camino a Laguna Brava
La Rioja
Argentina
02/27/2025
Alec Earnshaw
Foto
Photography ID: 595032
  Immature

Necochea
Buenos Aires
Argentina
08/05/2024
Alec Earnshaw
Foto
Photography ID: 170040
  Immature

Lomas de Asia
Lima
Peru
09/18/2016
Alec Earnshaw
Foto
Photography ID: 67588
  Immature

Yavi
Jujuy
Argentina
10/13/2014
Alec Earnshaw
Foto
Photography ID: 62138
  Adult

Copiapó
Región de Atacama
Chile
05/23/2008
Alec Earnshaw
Foto
Photography ID: 59908
  Adult

El Fuerte
Jujuy
Argentina
08/18/2014
Alec Earnshaw



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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
226522627/02/2025ArgentinaLa RiojaQuebrada Santo Domingo, Camino a Laguna Brava2Alec Earnshaw
226734926/02/2025ArgentinaLa RiojaRuta 40 camino a Villa Unión, Villa UniónAlec Earnshaw
226508922/02/2025ArgentinaLa Rioja3º Estacion - Puesto de Don Abrahan, ChilecitoAlec Earnshaw
226507221/02/2025ArgentinaLa RiojaRuta 74 entre Patquia y NonogastaAlec Earnshaw
212901105/08/2024ArgentinaBuenos AiresParaje Las Cascadas, NecocheaAlec Earnshaw
121048324/02/2020ArgentinaCórdobaCamino a Cuchi Corral, La Cumbre1Alec Earnshaw
120904222/02/2020ArgentinaCórdobaParque Nacional Quebrada del Condorito1Alec Earnshaw
48038918/09/2016PeruLimaLomas de Asia1Alec Earnshaw
19450513/10/2014ArgentinaJujuyYaviAlec Earnshaw
16972219/08/2014ArgentinaJujuyRuta Provincial 80 entre Palma Sola y límite con SaltaAlec Earnshaw
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.