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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 Neuquén

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: 678307
  Adult

Parque Nacional Laguna Blanca
Neuquén
Argentina
02/13/2026
Elsa Longo
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: 649429
  Adult

Los Bastos 2 Este
Neuquén
Argentina
03/20/2025
Fernando Naifleisch
Foto
Photography ID: 636812
  Adult

Collón Cura
Neuquén
Argentina
04/05/2025
Hernán Tolosa
Foto
Photography ID: 605742
  Adult

Las Ovejas
Neuquén
Argentina
10/18/2024
Hugo Alberto Valderrey
Foto
Photography ID: 592996
  Juvenile

Collón Cura
Neuquén
Argentina
01/10/2024
Tiziano Luka Pesci Rubilar



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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
243611219/02/2026ArgentinaNeuquénReserva Natural Urbana CotesmaNicolas Olejnik
243581618/02/2026ArgentinaNeuquénLaguna rosales, Parque Nacional LanínNicolas Olejnik
243519517/02/2026ArgentinaNeuquénLago Curruhue Grande, Parque Nacional Lanín2Nicolas Olejnik
243355215/02/2026ArgentinaNeuquénQuemquemtreu6Nicolas Olejnik
244838113/02/2026ArgentinaNeuquénParque Nacional Laguna BlancaElsa Longo
244520713/02/2026ArgentinaNeuquénParque Nacional Laguna BlancaGuillermo Marcaida
242843106/02/202619:23ArgentinaNeuquénSalvador Asmar 798-500, Junin de los Andes1Nicolas Olejnik
241733411/01/2026ArgentinaNeuquénLago Lacar, San martin de los andes.Gustavo Marasco
243583806/01/2026ArgentinaNeuquénNacimiento del río Limay, Parque Nacional Nahuel HuapiAndrea Casaburi
243583506/01/2026ArgentinaNeuquénNacimiento del río Limay, Parque Nacional Nahuel HuapiAndrea Casaburi
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 23/03/2026.