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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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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: 641295
  Adult

Las Heras
Mendoza
Argentina
06/16/2025
Damián Carnevale
Foto
Photography ID: 629359
  Adult

Departamento las heras
Mendoza
Argentina
04/02/2025
Damián Carnevale
Foto
Photography ID: 601146
  Juvenile

San Rafael
Mendoza
Argentina
09/21/2024
Damián Carnevale
Foto
Photography ID: 587649
  Juvenile

Lavalle
Mendoza
Argentina
06/17/2024
Damián Carnevale
Foto
Photography ID: 560047
  Adult

Departamento las heras
Mendoza
Argentina
02/20/2023
Damián Carnevale
Foto
Photography ID: 6413
  Juvenile

Ruta 40 Norte
Mendoza
Argentina
04/24/2011
Damián Carnevale
Foto
Photography ID: 1719
  Adult

Cerro Llorón
Mendoza
Argentina
08/08/2010
Damián Carnevale



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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
231310716/06/2025ArgentinaMendozaRuta 13 Casa de Piedra, Las HerasDamián Carnevale
226969302/04/2025ArgentinaMendozaReserva Natural Villavicencio y ruta de los caracoles de villavicencio, Departamento las herasDamián Carnevale
215613721/09/2024ArgentinaMendozaSan RafaelDamián Carnevale
204541517/06/2024ArgentinaMendozaPlanta de tratamiento de efluentes El Paramillo, LavalleDamián Carnevale
192973520/02/2023ArgentinaMendozaReserva Natural Villavicencio y ruta de los caracoles de villavicencio, Departamento las herasDamián Carnevale
1460324/04/2011ArgentinaMendozaRuta 40 NorteDamián Carnevale
756308/08/2010ArgentinaMendozaCerro LlorónDamián Carnevale
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 29/03/2026.