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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: 95383
  Juvenile

Parque Nacional los Cardones
Salta
Argentina
04/11/2015
Carlos Pauro
Foto
Photography ID: 94746
  Adult

El Piquete
Jujuy
Argentina
04/16/2015
Carlos Pauro
Foto
Photography ID: 68643
  Juvenile

Los Los
Salta
Argentina
11/09/2014
Carlos Pauro
Foto
Photography ID: 61766
  Juvenile

Piquete Cabado
Salta
Argentina
09/10/2014
Carlos Pauro
Foto
Photography ID: 60495
  Adult

Santa Rosa de Tastil
Salta
Argentina
08/30/2014
Carlos Pauro
Foto
Photography ID: 58697
  Juvenile

Las Lajitas
Salta
Argentina
08/07/2014
Carlos Pauro
Foto
Photography ID: 55914
  Juvenile

Pozo Hondo
Santiago del Estero
Argentina
07/09/2014
Carlos Pauro
Foto
Photography ID: 55911
  Adult

Salar del tronquito
Santiago del Estero
Argentina
07/09/2014
Carlos Pauro
Foto
Photography ID: 53565
  Adult

Los Los
Salta
Argentina
06/05/2014
Carlos Pauro
Foto
Photography ID: 52626
  Adult

Lumbreras
Salta
Argentina
05/20/2014
Carlos Pauro



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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
27231916/04/2015ArgentinaJujuySanta Rita, El PiqueteCarlos Pauro
27351511/04/2015ArgentinaSaltaValle Encantado, Parque Nacional los CardonesCarlos Pauro
19759609/11/2014ArgentinaSaltaCielo Verde, Los LosCarlos Pauro
17493610/09/2014ArgentinaSaltaKm 25 camino interno, Piquete CabadoCarlos Pauro
17218130/08/2014ArgentinaSaltaSanta Rosa de TastilCarlos Pauro
16663107/08/2014ArgentinaSaltaLas LajitasCarlos Pauro
15934609/07/2014ArgentinaSantiago del EsteroPozo HondoCarlos Pauro
15934409/07/2014ArgentinaSantiago del EsteroSalar del tronquitoCarlos Pauro
15359405/06/2014ArgentinaSaltaLos LosCarlos Pauro
15051120/05/2014ArgentinaSaltaLumbrerasCarlos Pauro
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 06/04/2026.