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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: 279380
  Adult

Bowen Periferia
Mendoza
Argentina
07/27/2018
Gonzalo Clifton Goldney
Foto
Photography ID: 279374
♂ ♀
  Adult

Bowen Periferia
Mendoza
Argentina
07/27/2018
Gonzalo Clifton Goldney
Foto
Photography ID: 279362
  Adult

Cascada Manqui Malal
Mendoza
Argentina
07/25/2018
Gonzalo Clifton Goldney
Foto
Photography ID: 259534
  Adult

Laguna Los Juncos
Río Negro
Argentina
01/19/2018
Gonzalo Clifton Goldney
Foto
Photography ID: 256423
  Juvenile

Caviahue
Neuquén
Argentina
01/08/2018
Gonzalo Clifton Goldney



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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
78775627/07/2018ArgentinaMendozaRuta Nacional 188 entre Unión y Bagual, Bowen PeriferiaGonzalo Clifton Goldney
78770225/07/2018ArgentinaMendozaCascada Manqui MalalGonzalo Clifton Goldney
74430419/01/2018ArgentinaRío NegroCerca de Jacobacci, Laguna Los JuncosGonzalo Clifton Goldney
71859808/01/2018ArgentinaNeuquénAnp Caviahue-copahue, CaviahueGonzalo Clifton Goldney
71887706/01/2018ArgentinaLa PampaParador de la Sierra, Alrededores del PN Lihue calelGonzalo Clifton Goldney
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 12/04/2026.