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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: 648120
  Adult

General Villegas
Buenos Aires
Argentina
08/05/2025
Silvio Lamothe
Foto
Photography ID: 626755
  Juvenile

Parque Nacional Lihué Calel
La Pampa
Argentina
03/02/2025
Silvio Lamothe
Foto
Photography ID: 608138
  Juvenile

Ruta 9
Catamarca
Argentina
07/23/2024
Silvio Lamothe
Foto
Photography ID: 544345
  Adult

Chaschuil
Catamarca
Argentina
03/28/2023
Silvio Lamothe
Foto
Photography ID: 505302
  Juvenile

Tafí del Valle
Tucumán
Argentina
07/07/2022
Silvio Lamothe
Foto
Photography ID: 505301
  Adult

Tafí del Valle
Tucumán
Argentina
07/07/2022
Silvio Lamothe
Foto
Photography ID: 496751
  Adult

Parque Nacional Talampaya
La Rioja
Argentina
03/31/2022
Silvio Lamothe
Foto
Photography ID: 393786
  Juvenile

Parque Nacional Lihué Calel
La Pampa
Argentina
02/23/2020
Silvio Lamothe
Foto
Photography ID: 194059
  Juvenile

Parque Nacional Lihué Calel
La Pampa
Argentina
02/27/2017
Silvio Lamothe
Foto
Photography ID: 100230
  Immature

Parque Nacional Lihué Calel
La Pampa
Argentina
05/23/2015
Silvio Lamothe
Foto
Photography ID: 96923
  Juvenile

General Villegas
Buenos Aires
Argentina
05/03/2015
Silvio Lamothe



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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
234306705/08/2025ArgentinaBuenos AiresLaguna entre General Villegas y Piedritas, General VillegasSilvio Lamothe
226299202/03/2025ArgentinaLa PampaParque Nacional Lihué CalelSilvio Lamothe
218481323/07/2024ArgentinaCatamarcaCamino de las higuerillas, Ruta 9Silvio Lamothe
180900728/03/2023ArgentinaCatamarcaChaschuilSilvio Lamothe
163100707/07/2022ArgentinaTucumánRuta 307 Tafi Del Valle, Tafí del ValleSilvio Lamothe
159606031/03/2022ArgentinaLa RiojaParque Nacional TalampayaSilvio Lamothe
123477723/02/2020ArgentinaLa PampaParque Nacional Lihué CalelSilvio Lamothe
55207527/02/2017ArgentinaLa PampaParque Nacional Lihué CalelSilvio Lamothe
42539031/03/2016ArgentinaCórdobaParque Nacional Quebrada del CondoritoSilvio Lamothe
28885423/05/2015ArgentinaLa PampaParque Nacional Lihué CalelSilvio Lamothe
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.