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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 Sobre Ruta 307 entre El Infiernillo y 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: 616408
 
El Infiernillo
Tucumán
Argentina
10/27/2024
Elsa Longo
Foto
Photography ID: 606855
  Juvenile

El Infiernillo
Tucumán
Argentina
08/17/2024
Viviana Fuentes
Foto
Photography ID: 552930
  Adult

El Infiernillo
Tucumán
Argentina
08/28/2023
Guillermo Marcaida
Foto
Photography ID: 532438
  Juvenile

El Infiernillo
Tucumán
Argentina
08/03/2006
Fernando Rasmussen
Foto
Photography ID: 517395
  Juvenile

El Infiernillo
Tucumán
Argentina
09/19/2022
Elsa Longo



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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
227094425/03/2025ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El Infiernillo4Gabriel Carbajales
222667527/10/2024ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El InfiernilloElsa Longo
218124117/08/2024ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El InfiernilloViviana Fuentes
190017928/08/2023ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El InfiernilloGuillermo Marcaida
178249516/06/2023ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El InfiernilloDiego Carus
178235116/06/2023ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El InfiernilloMaria Belén Dri
168638119/09/2022ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El InfiernilloElsa Longo
175399103/08/2006ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El InfiernilloFernando Rasmussen
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.