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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 San Rafael

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: 601147
  Immature

San Rafael
Mendoza
Argentina
09/21/2024
Manuel Godoy
Foto
Photography ID: 601146
  Juvenile

San Rafael
Mendoza
Argentina
09/21/2024
Damián Carnevale
Foto
Photography ID: 535174
  Adult

San Rafael
Mendoza
Argentina
05/13/2023
Pablo Moreno
Foto
Photography ID: 429601
  Juvenile

San Rafael
Mendoza
Argentina
01/12/2021
Pablo Moreno
Foto
Photography ID: 216222
  Adult

San Rafael
Mendoza
Argentina
08/27/2017
Feliciano Ferretti



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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
243668617/02/2026ArgentinaMendozaCabañas san jose de Pemehue, San Rafael2Emilio Martin Perez
215613821/09/2024ArgentinaMendozaSan RafaelManuel Godoy
215613721/09/2024ArgentinaMendozaSan RafaelDamián Carnevale
176564613/05/2023ArgentinaMendozaEmbalse El Nihuil, San Rafael1Pablo Moreno
156765831/03/2022ArgentinaMendozaRuta 180 cerca de Embalse El Nihuil, San Rafael1Sebastián Otero
135001912/01/2021ArgentinaMendozaRuta 40 camino a agua del toro, San RafaelPablo Moreno
60680827/08/2017ArgentinaMendoza2 marias limite con alvear, San RafaelFeliciano Ferretti
56887222/04/2017ArgentinaMendozaValle Grande, San Rafael1Sebastián Otero
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 11/03/2026.