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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 Capilla del Monte

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: 611666
  Adult

Capilla del Monte
Córdoba
Argentina
08/05/2017
Glauco Oliveira
Foto
Photography ID: 492653
  Adult

Capilla del Monte
Córdoba
Argentina
04/14/2022
Diego Trillo
Foto
Photography ID: 168624
  Adult

Capilla del Monte
Córdoba
Argentina
08/14/2016
Walter Bustamante



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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
161872802/08/2022ArgentinaCórdobaIntendente Finn 653, Capilla del MonteMarcelo Gavensky
157808214/04/2022ArgentinaCórdobaCabañas Markestó, Capilla del MonteDiego Trillo
178843820/05/2018ArgentinaCórdobaCerro Uritorco, Capilla del Monte1Martín Lépez
220250305/08/2017ArgentinaCórdobaCerro Uritorco, Capilla del MonteGlauco Oliveira
48057014/08/2016ArgentinaCórdobaLos Mogotes, Capilla del MonteWalter Bustamante
45973228/07/2016ArgentinaCórdobaLos Mogotes, Capilla del MonteAdriana Bellotti
30038717/06/2015ArgentinaCórdobaCapilla del MontePablo Meoniz
17524113/09/2014ArgentinaCórdobaCapilla del MonteEmiliano Garcia Loyola
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 15/03/2026.