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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 Laguna del Diamante

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: 570050
  Adult

Laguna del Diamante
Mendoza
Argentina
02/11/2024
Valentín González Feltrup
Foto
Photography ID: 349923
  Adult

Laguna del Diamante
Mendoza
Argentina
01/14/2019
Analía Gonzalez
Foto
Photography ID: 315728
  Fledgling

Laguna del Diamante
Mendoza
Argentina
01/14/2019
Max Uranga
Foto
Photography ID: 315266
 
Laguna del Diamante
Mendoza
Argentina
01/10/2019
Max Uranga
Foto
Photography ID: 315265
  Adult

Laguna del Diamante
Mendoza
Argentina
01/10/2019
Max Uranga
Foto
Photography ID: 235841
  Adult

Laguna del Diamante
Mendoza
Argentina
03/18/2017
Manuel Godoy
Foto
Photography ID: 141143
  Adult

Laguna del Diamante
Mendoza
Argentina
02/20/2016
Tomas Widow



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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
197173311/02/2024ArgentinaMendozaSeccional Alvarado, Laguna del DiamanteValentín González Feltrup
192929802/12/2023ArgentinaMendozaSeccional Alvarado, Laguna del Diamante1Pablo Moreno
170023307/01/2023ArgentinaMendozaSeccional Alvarado, Laguna del Diamante1Pablo Moreno
157403316/04/2022ArgentinaMendozaSeccional Alvarado, Laguna del Diamante1Pablo Moreno
118857908/02/2020ArgentinaMendozaLaguna del DiamanteLeonardo Caballero
97089714/01/2019ArgentinaMendozaLaguna del DiamanteAnalía Gonzalez
88451814/01/2019ArgentinaMendozaLaguna del DiamanteMax Uranga
88333610/01/2019ArgentinaMendozaLaguna del DiamanteMax Uranga
66320918/03/2017ArgentinaMendozaLaguna del DiamanteManuel Godoy
41034920/02/2016ArgentinaMendozaLaguna del DiamanteTomas Widow
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 12/03/2026.