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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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 Reports


 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
204015708/04/2024ArgentinaMendozaEl Sosneado1Sebastián Otero
204015808/04/2024ArgentinaMendozaRuta Nacional 144 (-34,939621, -69,036081)1Sebastián Otero
173903427/02/2023ArgentinaChubutRuta Provincial 2, Puerto Madryn1Sebastián Otero
189558724/02/2023ArgentinaChubutPlaya El Doradillo Bajada 2, Puerto Madryn1Sebastián Otero
156958303/04/2022ArgentinaMendozaVilla Santa Clara del Atuel, Valle Grande1Sebastián Otero
156774101/04/2022ArgentinaMendozaVilla Santa Clara del Atuel, Valle Grande1Sebastián Otero
156765831/03/2022ArgentinaMendozaRuta 180 cerca de Embalse El Nihuil, San Rafael1Sebastián Otero
156761230/03/2022ArgentinaMendozaVilla Santa Clara del Atuel, Valle Grande1Sebastián Otero
96140619/08/2019ArgentinaCórdobaAutopista 92Sebastián Otero
96276918/08/2019ArgentinaCórdobaParque Nacional Quebrada del Condorito4Sebastián Otero
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 22/03/2026.