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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 Parque Nacional El Leoncito

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: 571194
  Immature

Parque Nacional El Leoncito
San Juan
Argentina
10/27/2023
Jorgelina Lopez
Foto
Photography ID: 556216
  Juvenile

Parque Nacional El Leoncito
San Juan
Argentina
10/27/2023
Hernán Tolosa
Foto
Photography ID: 351164
  Juvenile

Parque Nacional El Leoncito
San Juan
Argentina
01/17/2019
Analía Gonzalez
Foto
Photography ID: 218399
  Juvenile

Parque Nacional El Leoncito
San Juan
Argentina
01/29/2017
Max Uranga
Foto
Photography ID: 56690
  Adult

Parque Nacional El Leoncito
San Juan
Argentina
07/10/2014
Pablo Eguia



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 Reports


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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
197547827/10/2023ArgentinaSan JuanParque Nacional El LeoncitoJorgelina Lopez
190687027/10/2023ArgentinaSan JuanParque Nacional El LeoncitoHernán Tolosa
118303716/01/2020ArgentinaSan JuanParque Nacional El LeoncitoOscar Lucero Bárcena
97569917/01/2019ArgentinaSan JuanParque Nacional El LeoncitoAnalía Gonzalez
61289529/01/2017ArgentinaSan JuanParque Nacional El LeoncitoMax Uranga
85659609/11/2016ArgentinaSan JuanParque Nacional El LeoncitoOscar Vilches Mendoza
15956310/07/2014ArgentinaSan JuanParque Nacional El LeoncitoPablo Eguia
8384002/11/2013ArgentinaSan JuanParque Nacional El LeoncitoFernando Alberto Segura
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 14/03/2026.