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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: 136483
 

Yavi
Jujuy
Argentina
01/17/2016
Mauricio Secchi



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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
165712109/10/2022ArgentinaLa PampaReserva Provincial Parque LuroMauricio Secchi
165702908/10/2022ArgentinaLa PampaParque Nacional Lihué CalelMauricio Secchi
165695607/10/2022ArgentinaLa PampaReserva natural de UltracanMauricio Secchi
160185520/06/2022ArgentinaJujuyLaguna hedionda, Ruta 1 entre Caimancito y el PiqueteMauricio Secchi
159917518/06/2022ArgentinaJujuyReserva Natural Privada Ecoportal de PiedraMauricio Secchi
159855417/06/2022ArgentinaJujuyReserva Natural Privada Ecoportal de PiedraMauricio Secchi
159549916/06/2022ArgentinaSantiago del EsteroRuta Nacional 9Mauricio Secchi
96202518/08/2019ArgentinaCórdobaAcceso Parque Nacional Quebrada del Condorito (-31,627471, -64,708552), Parque Nacional Quebrada del CondoritoMauricio Secchi
94348811/07/2019ArgentinaSaltaRuta Nacional 9 (-24,799576, -65,210695)Mauricio Secchi
87828829/01/2019ArgentinaBuenos AiresTacuarita, Villa Ventana2Mauricio Secchi
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 25/03/2026.