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Species icon
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: 670586
 
Santa María
Catamarca
Argentina
05/16/2014
Viviana Fuentes
Foto
Photography ID: 670181
♂ ♀
  Adult

Cafayate
Salta
Argentina
01/28/2026
Viviana Fuentes
Foto
Photography ID: 607260
  Juvenile

Camino a El Infiernilllo
Tucumán
Argentina
10/11/2024
Viviana Fuentes
Foto
Photography ID: 606855
  Juvenile

El Infiernillo
Tucumán
Argentina
08/17/2024
Viviana Fuentes
Foto
Photography ID: 605460
  Adult

Santa María
Catamarca
Argentina
10/14/2024
Viviana Fuentes
Foto
Photography ID: 605459
  Juvenile

Santa María
Catamarca
Argentina
10/14/2024
Viviana Fuentes
Foto
Photography ID: 417306
 
Yerba Buena
Tucumán
Argentina
11/02/2020
Viviana Fuentes
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
Foto
Photography ID: 395581
 
Tafí del Valle
Tucumán
Argentina
04/19/2020
Viviana Fuentes
Foto
Photography ID: 395580
 
Tafí del Valle
Tucumán
Argentina
04/19/2020
Viviana Fuentes
Foto
Photography ID: 395579
 
Tafí del Valle
Tucumán
Argentina
04/19/2020
Viviana Fuentes



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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
242411228/01/2026ArgentinaSaltaCamino a San Carlos, CafayateViviana Fuentes
217481514/10/2024ArgentinaCatamarcaEntre santa maria y amaicha del valle, Santa MaríaViviana Fuentes
218231111/10/2024ArgentinaTucumánCamino a El InfiernillloViviana Fuentes
218124117/08/2024ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El InfiernilloViviana Fuentes
193522728/12/2023ArgentinaTucumánTucumánViviana Fuentes
130619302/11/2020ArgentinaTucumánCamino de sirga, Yerba BuenaViviana Fuentes
123807819/04/2020ArgentinaTucumánTafí del Valle, Tafí del ValleViviana Fuentes
123802519/04/2020ArgentinaTucumánAmpimpa, Amaicha del ValleViviana Fuentes
119727717/02/2020ArgentinaTucumánRuta 307 entre El Infiernillo y Amaicha del Valle, Tafí del ValleViviana Fuentes
119605815/02/2020ArgentinaTucumánRuta 307 entre Tafí del Valle y El Infiernillo, Tafí del ValleViviana Fuentes
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 30/03/2026.