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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 Rey

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: 536760
  Immature

Parque Nacional El Rey
Salta
Argentina
05/26/2023
Jorge Schlemmer
Foto
Photography ID: 151878
  Immature

Parque Nacional El Rey
Salta
Argentina
05/21/2016
Héctor Bernardo Fernández
Foto
Photography ID: 109337
  Adult

Parque Nacional El Rey
Salta
Argentina
07/28/2015
Luis Emilio Lorenzo
Foto
Photography ID: 69947
  Adult

Parque Nacional El Rey
Salta
Argentina
07/20/2014
Laura Dodyk



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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
177456126/05/2023ArgentinaSaltaParque Nacional El ReyJorge Schlemmer
43954321/05/2016ArgentinaSaltaCamino de acceso, Parque Nacional El ReyHéctor Bernardo Fernández
31431128/07/2015ArgentinaSaltaParque Nacional El ReyLuis Emilio Lorenzo
31273524/07/2015ArgentinaSaltaParque Nacional El ReyLuis Emilio Lorenzo
16249220/07/2014ArgentinaSaltaCamping, Parque Nacional El ReyLaura Dodyk
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.