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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 Lavalle

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: 588155
  Immature

Lavalle
Mendoza
Argentina
06/17/2024
Manuel Godoy
Foto
Photography ID: 587649
  Juvenile

Lavalle
Mendoza
Argentina
06/17/2024
Damián Carnevale
Foto
Photography ID: 586258
  Immature

Lavalle
Mendoza
Argentina
12/14/2005
Manuel Godoy
Foto
Photography ID: 584919
  Adult

Lavalle
Mendoza
Argentina
05/20/2024
Pablo Moreno



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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
210829411/07/2024ArgentinaMendozaPlanta de tratamiento de efluentes El Paramillo, Lavalle1Emilio Martin Perez
204677317/06/2024ArgentinaMendozaPlanta de tratamiento de efluentes El Paramillo, LavalleManuel Godoy
204541517/06/2024ArgentinaMendozaPlanta de tratamiento de efluentes El Paramillo, LavalleDamián Carnevale
203663320/05/2024ArgentinaMendozaPlanta de tratamiento de efluentes El Paramillo, LavallePablo Moreno
161892302/08/2022ArgentinaMendozaPlanta de tratamiento de efluentes El Paramillo, Lavalle1Emilio Martin Perez
204036114/12/2005ArgentinaMendozaPlanta de tratamiento de efluentes El Paramillo, LavalleManuel Godoy
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 13/03/2026.