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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: 630672
  Adult

Santa Ana de Valle Grande
Jujuy
Argentina
04/10/2025
Diego Carus
Foto
Photography ID: 531613
  Adult

El Infiernillo
Tucumán
Argentina
04/08/2023
Diego Carus
Foto
Photography ID: 485496
  Adult

Santa Ana de Valle Grande
Jujuy
Argentina
02/27/2022
Diego Carus
Foto
Photography ID: 372294
  Juvenile

El Infiernillo
Tucumán
Argentina
12/26/2019
Diego Carus
Foto
Photography ID: 372286
  Adult

Tafí del Valle
Tucumán
Argentina
12/29/2019
Diego Carus
Foto
Photography ID: 332194
  Adult

Reserva Provincial Los Sosa
Tucumán
Argentina
05/12/2019
Diego Carus
Foto
Photography ID: 332193
  Adult

Reserva Provincial Los Sosa
Tucumán
Argentina
05/12/2019
Diego Carus
Foto
Photography ID: 332192
  Juvenile

El Infiernillo
Tucumán
Argentina
05/13/2019
Diego Carus
Foto
Photography ID: 331841
 
El Infiernillo
Tucumán
Argentina
05/13/2019
Diego Carus



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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
240622417/12/2025ArgentinaTucumánCascada Los Alisos, Tafí del ValleDiego Carus
240604406/12/2025ArgentinaTucumánQuebrada del río Churqui, El InfiernilloDiego Carus
227888711/04/2025ArgentinaJujuyLaguna del Huancar, Abra PampaDiego Carus
227886211/04/2025ArgentinaJujuyAcceso a Inca CuevaDiego Carus
227378310/04/2025ArgentinaJujuyAbra de Santa Ana, Santa Ana de Valle GrandeDiego Carus
227876308/04/2025ArgentinaJujuySanta AnaDiego Carus
221361409/12/2024ArgentinaTucumánQuebrada del río Churqui, El InfiernilloDiego Carus
221359408/12/2024ArgentinaTucumánQuebrada del Barón, El InfiernilloDiego Carus
178252718/06/2023ArgentinaTucumánRuinas de los QuilmesDiego Carus
178250417/06/2023ArgentinaTucumánQuebrada del Barón, El InfiernilloDiego Carus
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 17/03/2026.