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: 679696
  Adult

Vallecitos. seccional guardaparques
Mendoza
Argentina
03/14/2026
Pablo Moreno
Foto
Photography ID: 636468
  Adult

Carrizal de abajo
Mendoza
Argentina
05/11/2025
Pablo Moreno
Foto
Photography ID: 600362
  Immature

General Pedernera
San Luis
Argentina
09/14/2024
Pablo Moreno
Foto
Photography ID: 586169
  Adult

La Carrera
Mendoza
Argentina
06/01/2024
Pablo Moreno
Foto
Photography ID: 584919
  Adult

Lavalle
Mendoza
Argentina
05/20/2024
Pablo Moreno
Foto
Photography ID: 570310
  Adult

Malargüe
Mendoza
Argentina
02/10/2024
Pablo Moreno
Foto
Photography ID: 567615
  Adult

Las Heras
Mendoza
Argentina
01/28/2024
Pablo Moreno
Foto
Photography ID: 559075
  Juvenile

San Carlos
Mendoza
Argentina
11/18/2023
Pablo Moreno
Foto
Photography ID: 545725
  Adult

La Paz
Mendoza
Argentina
08/05/2023
Pablo Moreno
Foto
Photography ID: 535174
  Adult

San Rafael
Mendoza
Argentina
05/13/2023
Pablo Moreno
Foto
Photography ID: 534787
  Adult

Ruta 13, Las Heras
Mendoza
Argentina
04/30/2023
Pablo Moreno
Foto
Photography ID: 528082
  Adult

Portezuelo del carqueque
Mendoza
Argentina
03/05/2023
Pablo Moreno



 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
245276414/03/2026ArgentinaMendozaVallecitos. seccional guardaparques1Pablo Moreno
245263514/03/2026ArgentinaMendozaVallecito, Mendoza, Ar (-32,981, -69,352)1Pablo Moreno
241925218/01/2026ArgentinaMendozaQuebrada de la virgen1Pablo Moreno
241597310/01/2026ArgentinaMendozaReserva Natural Divisadero Largo1Pablo Moreno
232847208/06/2025ArgentinaSaltaRuta Provincial 541Pablo Moreno
229344311/05/2025ArgentinaMendozaEl carrizal, Carrizal de abajoPablo Moreno
225416330/01/2025ArgentinaSaltaEmbalse Laguna del Toro, Rosario de Lerma1Pablo Moreno
215311214/09/2024ArgentinaSan LuisGeneral PederneraPablo Moreno
204950109/06/2024ArgentinaSan LuisMirador de los condores, Villa de Merlo3Pablo Moreno
204017001/06/2024ArgentinaMendozaLa CarreraPablo Moreno
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 29/03/2026.