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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 Tafí del Valle

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: 651936
  Immature

Tafí del Valle
Tucumán
Argentina
09/04/2024
Mauro Desch
Foto
Photography ID: 539964
  Adult

Tafí del Valle
Tucumán
Argentina
04/15/2022
Walter Bustamante
Foto
Photography ID: 539819
  Adult

Tafí del Valle
Tucumán
Argentina
05/08/2022
Jose Luis Fernandez Guaraz
Foto
Photography ID: 534850
  Immature

Tafí del Valle
Tucumán
Argentina
05/01/2023
Héctor Schreiber
Foto
Photography ID: 524024
  Juvenile

Tafí del Valle
Tucumán
Argentina
07/15/2011
Ramon Moller Jensen
Foto
Photography ID: 524023
  Juvenile

Tafí del Valle
Tucumán
Argentina
07/15/2011
Ramon Moller Jensen
Foto
Photography ID: 513947
  Adult

Tafí del Valle
Tucumán
Argentina
11/03/2022
Daniel Osvaldo Fernández
Foto
Photography ID: 505302
  Juvenile

Tafí del Valle
Tucumán
Argentina
07/07/2022
Silvio Lamothe
Foto
Photography ID: 505301
  Adult

Tafí del Valle
Tucumán
Argentina
07/07/2022
Silvio Lamothe
Foto
Photography ID: 477601
  Adult

Tafí del Valle
Tucumán
Argentina
04/17/2021
Marcelo A Carranza
Foto
Photography ID: 395682
 
Tafí del Valle
Tucumán
Argentina
04/19/2020
Viviana Fuentes
Foto
Photography ID: 395680
 
Tafí del Valle
Tucumán
Argentina
04/19/2020
Viviana Fuentes



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Last Vocalizations published




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Last Filmings published


Video ID: 5252
  Juvenile

Tafí del Valle
Tucumán
Argentina
05/31/2022
Santos Di Mauro



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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
240670217/12/2025ArgentinaTucumánCascada Los Alisos, Tafí del ValleMaria Belén Dri
240622417/12/2025ArgentinaTucumánCascada Los Alisos, Tafí del ValleDiego Carus
233185701/08/202517:19ArgentinaTucumánRuta Provincial 307, Tafí del Valle2Santiago Juan Torres
231617907/07/202515:11ArgentinaTucumánRuta Provincial 307, Tafí del ValleGuillermo Marcaida
227104426/03/2025ArgentinaTucumánCuesta Los Cardones, Tafí del Valle4Gabriel Carbajales
235198704/09/2024ArgentinaTucumánEl Infiernillo, Tafí del Valle2Mauro Desch
202866929/04/2024ArgentinaTucumánRuta Provincial 307, Tafí del Valle4Julian Uriel Collado
202865529/04/2024ArgentinaTucumánRuta Provincial 307, Tafí del ValleJulian Uriel Collado
202840929/04/2024ArgentinaTucumánRuta Provincial 307, Tafí del Valle4Silvina Collado
202838729/04/2024ArgentinaTucumánRuta Provincial 307, Tafí del ValleSilvina Collado
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.