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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 Junin de los Andes

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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Latest feeding records




Last published photographs

Foto
Photography ID: 494695
  Adult

Junin de los Andes
Neuquén
Argentina
05/11/2022
Eduardo Cusano
Foto
Photography ID: 294478
  Adult

Junin de los Andes
Neuquén
Argentina
10/21/2018
Nicolas Onorato
Foto
Photography ID: 253991
  Immature

Junin de los Andes
Neuquén
Argentina
02/21/2018
Sergio Cusano
Foto
Photography ID: 168008
  Adult

Junin de los Andes
Neuquén
Argentina
09/10/2016
Eduardo Cusano
Foto
Photography ID: 159309
  Adult

Junin de los Andes
Neuquén
Argentina
07/26/2016
Eduardo Cusano
Foto
Photography ID: 159296
  Adult

Junin de los Andes
Neuquén
Argentina
07/26/2016
Eduardo Cusano
Foto
Photography ID: 108916
  Adult

Junin de los Andes
Neuquén
Argentina
07/22/2015
Sergio Cusano
Foto
Photography ID: 57045
  Juvenile

Junin de los Andes
Neuquén
Argentina
07/26/2014
Sergio Cusano
Foto
Photography ID: 56944
  Adult

Junin de los Andes
Neuquén
Argentina
07/23/2014
Eduardo Cusano
Foto
Photography ID: 56782
  Adult

Junin de los Andes
Neuquén
Argentina
07/23/2014
Sergio Cusano



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Last Vocalizations published




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Last Filmings published


Video ID: 1941
  Adult

Junin de los Andes
Neuquén
Argentina
09/10/2016
Eduardo Cusano



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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
242843106/02/202619:23ArgentinaNeuquénSalvador Asmar 798-500, Junin de los Andes1Nicolas Olejnik
232952231/07/2025ArgentinaNeuquénRuta 40 entre la Rinconada y Junin de Los Andes, Junin de los Andes1Neri Aigo
203014206/04/2024ArgentinaNeuquénJunín de los Andes, Junin de los AndesAdrian Braidotti
195936528/01/2024ArgentinaNeuquénValle del rio Curruhue, Junin de los AndesNicolas Olejnik
193344123/12/2023ArgentinaNeuquénValle del rio Curruhue, Junin de los AndesNicolas Olejnik
190353330/10/2023ArgentinaNeuquénValle del rio Curruhue, Junin de los Andes2Nicolas Olejnik
189355207/10/2023ArgentinaNeuquénJunin de los AndesNicolas Olejnik
188678723/09/2023ArgentinaNeuquénJunin de los Andes2Nicolas Olejnik
188511518/09/2023ArgentinaNeuquénCerro Corfone., Junin de los Andes2Nicolas Olejnik
182469311/09/2023ArgentinaNeuquénMallin del Toro, Junin de los AndesNicolas Olejnik
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 10/03/2026.