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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: 647551
  Adult

Sierras de los Comechingones
San Luis
Argentina
06/04/2025
Guillermo Marcaida
Foto
Photography ID: 587839
  Adult

Merlo
San Luis
Argentina
05/19/2024
Guillermo Marcaida
Foto
Photography ID: 552930
  Adult

El Infiernillo
Tucumán
Argentina
08/28/2023
Guillermo Marcaida
Foto
Photography ID: 307025
  Adult

Yavi
Jujuy
Argentina
09/24/2018
Guillermo Marcaida
Foto
Photography ID: 287302
  Adult

Cerro de la Gloria
Buenos Aires
Argentina
08/17/2018
Guillermo Marcaida
Foto
Photography ID: 248816
  Adult

El Bolsón
Río Negro
Argentina
01/29/2018
Guillermo Marcaida
Foto
Photography ID: 247485
  Immature

General Acha
La Pampa
Argentina
01/20/2018
Guillermo Marcaida
Foto
Photography ID: 103301
  Adult

Tornquist
Buenos Aires
Argentina
06/10/2015
Guillermo Marcaida
Foto
Photography ID: 85784
  Immature

Parque Nacional Lihué Calel
La Pampa
Argentina
02/15/2015
Guillermo Marcaida



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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
244520713/02/2026ArgentinaNeuquénParque Nacional Laguna BlancaGuillermo Marcaida
231617907/07/202515:11ArgentinaTucumánRuta Provincial 307, Tafí del ValleGuillermo Marcaida
234031304/06/2025ArgentinaSan LuisCamino del filo, Merlo, Sierras de los ComechingonesGuillermo Marcaida
229491903/06/202516:14ArgentinaCórdobaRuta Nacional 148Guillermo Marcaida
229479002/06/202517:32ArgentinaSan LuisVía Sin NombreGuillermo Marcaida
204616219/05/2024ArgentinaSan LuisFilo, MerloGuillermo Marcaida
189929329/08/2023ArgentinaCórdobaVilla María de Río SecoGuillermo Marcaida
190017928/08/2023ArgentinaTucumánSobre Ruta 307 entre El Infiernillo y Tafí del Valle, El InfiernilloGuillermo Marcaida
189928928/08/2023ArgentinaTucumánRuta 307 entre El Infiernillo y Amaicha del ValleGuillermo Marcaida
189923025/08/2023ArgentinaTucumánRuta 307 entre El Infiernillo y Amaicha del Valle, Tafí del ValleGuillermo Marcaida
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.