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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 Parque Nacional Nahuel Huapi

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: 673777
  Fledgling

Parque Nacional Nahuel Huapi
Neuquén
Argentina
01/06/2026
Andrea Casaburi
Foto
Photography ID: 673773
  Adult

Parque Nacional Nahuel Huapi
Neuquén
Argentina
01/06/2026
Andrea Casaburi
Foto
Photography ID: 673771
  Adult

Parque Nacional Nahuel Huapi
Neuquén
Argentina
01/06/2026
Andrea Casaburi
Foto
Photography ID: 291913
  Adult

Parque Nacional Nahuel Huapi
Neuquén
Argentina
10/13/2018
Luis Carlos Lugo
Foto
Photography ID: 252807
  Adult

Parque Nacional Nahuel Huapi
Neuquén
Argentina
02/28/2018
Diego Carus
Foto
Photography ID: 196643
  Adult

Parque Nacional Nahuel Huapi
Neuquén
Argentina
02/22/2017
Julian Garcia
Foto
Photography ID: 24363
  Juvenile

Parque Nacional Nahuel Huapi
Neuquén
Argentina
03/03/2013
Eduardo Cusano



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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
243583806/01/2026ArgentinaNeuquénNacimiento del río Limay, Parque Nacional Nahuel HuapiAndrea Casaburi
243583506/01/2026ArgentinaNeuquénNacimiento del río Limay, Parque Nacional Nahuel HuapiAndrea Casaburi
243583306/01/2026ArgentinaNeuquénNacimiento del río Limay, Parque Nacional Nahuel HuapiAndrea Casaburi
81937213/10/2018ArgentinaNeuquénRuta 40 y Rio Limay, Parque Nacional Nahuel HuapiLuis Carlos Lugo
91427728/02/2018ArgentinaNeuquénCerro Belvedere- Cajón Negro, Parque Nacional Nahuel HuapiMaria Belén Dri
71171628/02/2018ArgentinaNeuquénCerro Belvedere- Cajón Negro, Parque Nacional Nahuel HuapiGonzalo Diaz
71084728/02/2018ArgentinaNeuquénCerro Belvedere- Cajón Negro, Parque Nacional Nahuel HuapiDiego Carus
70180726/01/2018ArgentinaNeuquénLago Correntoso, Parque Nacional Nahuel HuapiGuillermo Marcaida
55967522/02/2017ArgentinaNeuquénRuta 40 y arroyo La Estacada, Parque Nacional Nahuel HuapiJulian Garcia
12451315/03/2014ArgentinaNeuquénCamino a Cajón Negro, Parque Nacional Nahuel HuapiPablo Brudnick
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 15/03/2026.