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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 Reserva Provincial Los Sosa

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: 332194
  Adult

Reserva Provincial Los Sosa
Tucumán
Argentina
05/12/2019
Diego Carus
Foto
Photography ID: 332193
  Adult

Reserva Provincial Los Sosa
Tucumán
Argentina
05/12/2019
Diego Carus
Foto
Photography ID: 7537
  Adult

Reserva Provincial Los Sosa
Tucumán
Argentina
06/17/2011
Diego Oscar



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 Reports


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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
227101426/03/2025ArgentinaTucumánReserva Provincial Los Sosa1Gabriel Carbajales
215792329/07/2024ArgentinaTucumánReserva Provincial Los Sosa1Diego Oscar
178243014/06/2023ArgentinaTucumánVirgen de las flores, Reserva Provincial Los SosaDiego Carus
178224814/06/2023ArgentinaTucumánVirgen de las flores, Reserva Provincial Los SosaMaria Belén Dri
161717021/07/2022ArgentinaTucumánEl aluvion, Reserva Provincial Los SosaPablo Meoniz
92353512/05/2019ArgentinaTucumánReserva Provincial Los SosaMaria Belén Dri
92285612/05/2019ArgentinaTucumánReserva Provincial Los SosaDiego Carus
60759227/08/2017ArgentinaTucumánRío Los Sosa, Reserva Provincial Los SosaSebastián Rozadilla
1566117/06/2011ArgentinaTucumánReserva Provincial Los SosaDiego Oscar
1542617/06/2011ArgentinaTucumánReserva Provincial Los SosaJorge La Grotteria
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 12/03/2026.