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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 Reserva Natural Estricta Quebrada de las Higueritas

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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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
164844022/09/2022ArgentinaSan LuisReserva Natural Estricta Quebrada de las Higueritas1Julián Tocce
115754403/01/2020ArgentinaSan LuisReserva Natural Estricta Quebrada de las HigueritasSamuel Ernesto Olivieri Bornand
44116823/05/2016ArgentinaSan LuisReserva Natural Estricta Quebrada de las HigueritasGuillermo Marcaida
41783709/03/2016ArgentinaSan LuisCerro la bandera, Reserva Natural Estricta Quebrada de las HigueritasSamuel Ernesto Olivieri Bornand
31091624/07/2015ArgentinaSan LuisReserva Natural Estricta Quebrada de las HigueritasSergio Gabriel Borrillo
30699127/06/2015ArgentinaSan LuisCasa del guardaparque, Reserva Natural Estricta Quebrada de las HigueritasTomas Widow
29596518/06/2015ArgentinaSan LuisArroyo las Higueritas Norte, Reserva Natural Estricta Quebrada de las HigueritasSamuel Ernesto Olivieri Bornand
27979809/05/2015ArgentinaSan LuisReserva Natural Estricta Quebrada de las HigueritasIgnacio Koning
16678306/05/2011ArgentinaSan LuisOficina de guardaparques, Reserva Natural Estricta Quebrada de las HigueritasSamuel Ernesto Olivieri Bornand
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 17/03/2026.