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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: 537519
  Juvenile

Puerto Deseado
Santa Cruz
Argentina
03/11/2023
Santos Di Mauro
Foto
Photography ID: 537517
  Adult

Puerto Deseado
Santa Cruz
Argentina
03/11/2023
Santos Di Mauro
Foto
Photography ID: 392286
  Juvenile

Villa Pehuenia
Neuquén
Argentina
02/28/2016
Santos Di Mauro
Foto
Photography ID: 392284
  Juvenile

Parque Provincial El Tromen
Neuquén
Argentina
02/22/2016
Santos Di Mauro
Foto
Photography ID: 317016
  Adult

El Infiernillo
Tucumán
Argentina
05/06/2015
Santos Di Mauro
Foto
Photography ID: 231061
  Immature

Abra Pampa
Jujuy
Argentina
10/15/2017
Santos Di Mauro
Foto
Photography ID: 231060
  Juvenile

Abra Pampa
Jujuy
Argentina
10/15/2017
Santos Di Mauro
Foto
Photography ID: 203384
  Juvenile

Purmamarca
Jujuy
Argentina
05/16/2015
Santos Di Mauro



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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
Video ID: 2886
  Juvenile

Abra Pampa
Jujuy
Argentina
10/15/2017
Santos Di Mauro
Video ID: 2847
  Juvenile

Abra Pampa
Jujuy
Argentina
10/15/2017
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
177679211/03/2023ArgentinaSanta CruzPuerto Deseado, Puerto DeseadoSantos Di Mauro
161672831/05/2022ArgentinaTucumánRuta 307 Entre El Infiernillo Y Tafi Del Valle, Tafí del ValleSantos Di Mauro
64167315/10/2017ArgentinaJujuyRuta Nacional 9, al norte, Abra PampaSantos Di Mauro
47470903/09/2016ArgentinaChubutÁrea Natural Protegida Península ValdésSantos Di Mauro
42175906/03/2016ArgentinaNeuquénCerro ChapelcoSantos Di Mauro
123239028/02/2016ArgentinaNeuquénVilla PehueniaSantos Di Mauro
123238922/02/2016ArgentinaNeuquénLaguna Tromen, Parque Provincial El TromenSantos Di Mauro
57660416/05/2015ArgentinaJujuyEn arbustos bajos sobre el río Purmamarca detrás del hotel Manantial del silencio, PurmamarcaSantos Di Mauro
88738906/05/2015ArgentinaTucumánEl InfiernilloSantos Di Mauro
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 22/03/2026.