Don't want to see ads? Sign up...





Species icon
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

 Request change
Filters


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




Loading map...




Last published photographs

Foto
Photography ID: 405783
  Adult

Cerrillos
Salta
Argentina
07/26/2020
Ramón Rodolfo Copa
Foto
Photography ID: 405782
  Adult

Cerrillos
Salta
Argentina
07/26/2020
Ramón Rodolfo Copa
Foto
Photography ID: 278907
  Adult

La Silleta
Salta
Argentina
07/30/2018
Ramón Rodolfo Copa
Foto
Photography ID: 251105
  Juvenile

El Maitén
Chubut
Argentina
02/15/2018
Ramón Rodolfo Copa
Foto
Photography ID: 212093
  Adult

Salta (Capital)
Salta
Argentina
07/28/2017
Ramón Rodolfo Copa
Foto
Photography ID: 212081
  Juvenile

Campo quijano
Salta
Argentina
07/27/2017
Ramón Rodolfo Copa
Foto
Photography ID: 207437
  Adult

Campo quijano
Salta
Argentina
06/22/2017
Ramón Rodolfo Copa
Foto
Photography ID: 203030
  Adult

Departamento Los Cerrillos
Salta
Argentina
05/18/2017
Ramón Rodolfo Copa
Foto
Photography ID: 203029
  Juvenile

Departamento Los Cerrillos
Salta
Argentina
05/18/2017
Ramón Rodolfo Copa



 View all photographs of the species




 Add a photography of this species





Last Vocalizations published




 Add an audio of this species





Last Filmings published




 Add a film of this species





 Reports


 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
127617326/07/2020ArgentinaSaltaCerrillosRamón Rodolfo Copa
96187020/08/2019ArgentinaSaltaReserva Natural Provincial Las CostasRamón Rodolfo Copa
78638530/07/2018ArgentinaSaltaLa SilletaRamón Rodolfo Copa
70715115/02/2018ArgentinaChubutEl MaiténRamón Rodolfo Copa
59560428/07/2017ArgentinaSaltaAtocha, Salta (Capital)Ramón Rodolfo Copa
59559127/07/2017ArgentinaSaltaViaducto del Rio Toro, Campo quijanoRamón Rodolfo Copa
59034009/07/2017ArgentinaSaltaReserva Natural Provincial Las CostasRamón Rodolfo Copa
58567422/06/2017ArgentinaSaltaViaducto del Rio Toro, Campo quijanoRamón Rodolfo Copa
57625821/05/2017ArgentinaSaltaReserva Natural Provincial Las CostasRamón Rodolfo Copa
57566818/05/2017ArgentinaSaltaCerrillos, Departamento Los CerrillosRamón Rodolfo Copa
Page 1

 Add a record of this species

Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 20/03/2026.