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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 Área Tromen

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: 307530
  Immature

Parque Nacional Lanín
Neuquén
Argentina
02/13/2018
Fernando Alberto Segura
Foto
Photography ID: 252987
  Adult

Parque Nacional Lanín
Neuquén
Argentina
02/27/2018
Eduardo Cusano
Foto
Photography ID: 21831
  Adult

Parque Nacional Lanín
Neuquén
Argentina
04/06/2013
Astrid Wessels



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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
167741421/11/2022ArgentinaNeuquénÁrea Tromen, Parque Nacional LanínDolores Fernandez
157244120/04/2022ArgentinaNeuquénÁrea Tromen, Parque Nacional LanínNicolas Olejnik
156037519/03/2022ArgentinaNeuquénÁrea Tromen, Parque Nacional LanínNicolas Olejnik
138466124/03/2021ArgentinaNeuquénÁrea Tromen, Parque Nacional Lanín1Nicolas Olejnik
136333831/01/2021ArgentinaNeuquénÁrea Tromen, Parque Nacional Lanín1Adriana Bellotti
85317902/12/2018ArgentinaNeuquénÁrea Tromen, Parque Nacional Lanín1Nicolas Olejnik
71126927/02/2018ArgentinaNeuquénÁrea Tromen, Parque Nacional LanínEduardo Cusano
86098413/02/2018ArgentinaNeuquénÁrea Tromen, Parque Nacional LanínFernando Alberto Segura
5868406/04/2013ArgentinaNeuquénÁrea Tromen, Parque Nacional LanínAstrid Wessels
2717018/01/2012ArgentinaNeuquénÁrea Tromen, Parque Nacional LanínJorge La Grotteria
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 05/04/2026.