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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: 172715
  Adult

Refugio el Peñón
La Rioja
Argentina
10/09/2016
Gustavo Fernando Durán
Foto
Photography ID: 129222
  Adult

Cerro Champaquí
Córdoba
Argentina
11/28/2015
Gustavo Fernando Durán
Foto
Photography ID: 71345
  Juvenile

Cerro Champaquí
Córdoba
Argentina
07/07/2012
Gustavo Fernando Durán
Foto
Photography ID: 68717
  Adult

Cerro Champaquí
Córdoba
Argentina
06/22/2013
Gustavo Fernando Durán
Foto
Photography ID: 66826
  Adult

Cerro Champaquí
Córdoba
Argentina
07/08/2012
Gustavo Fernando Durán



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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
225500916/02/202513:31ArgentinaCórdobaBalcon Norte, Parque Nacional Quebrada del Condorito1Gustavo Fernando Durán
192464006/12/2023ArgentinaRío NegroAcceso Cerro Otto, San Carlos de Bariloche1Gustavo Fernando Durán
102996215/08/2019ArgentinaChubutRuta Provincial 21Gustavo Fernando Durán
49648509/10/2016ArgentinaLa RiojaRefugio el PeñónGustavo Fernando Durán
53013407/10/2016ArgentinaSan JuanParque Provincial IschigualastoGustavo Fernando Durán
42062807/03/2016ArgentinaRío NegroRuta Provincial 3 y Rp 61Gustavo Fernando Durán
37549228/11/2015ArgentinaCórdobaCerro ChampaquíGustavo Fernando Durán
37381327/11/2015ArgentinaCórdobaCamino al Cerro ChampaquíGustavo Fernando Durán
19766822/06/2013ArgentinaCórdobaCerro ChampaquíGustavo Fernando Durán
19159108/07/2012ArgentinaCórdobaCerro ChampaquíGustavo Fernando Durán
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.