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

Records from San Martin de los Andes

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...

Latest feeding records




Last published photographs

Foto
Photography ID: 526666
  Adult

San Martin de los Andes
Neuquén
Argentina
12/27/2022
Fernando Naifleisch
Foto
Photography ID: 187675
  Adult

San Martin de los Andes
Neuquén
Argentina
01/31/2017
Gustavo Castaing
Foto
Photography ID: 183560
  Immature

San Martin de los Andes
Neuquén
Argentina
08/06/2016
Max Uranga
Foto
Photography ID: 172072
  Immature

San Martin de los Andes
Neuquén
Argentina
08/06/2016
Max Uranga
Foto
Photography ID: 25456
  Adult

San Martin de los Andes
Neuquén
Argentina
08/22/2013
Eduardo Cusano
Foto
Photography ID: 25392
  Adult

San Martin de los Andes
Neuquén
Argentina
08/17/2013
Eduardo Cusano
Foto
Photography ID: 25237
  Adult

San Martin de los Andes
Neuquén
Argentina
08/17/2013
Eduardo Cusano
Foto
Photography ID: 24986
  Adult

San Martin de los Andes
Neuquén
Argentina
07/21/2013
Sergio Cusano
Foto
Photography ID: 24985
  Adult

San Martin de los Andes
Neuquén
Argentina
07/21/2013
Sergio Cusano
Foto
Photography ID: 24366
  Adult

San Martin de los Andes
Neuquén
Argentina
07/21/2013
Eduardo Cusano



 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
229722926/03/2025ArgentinaNeuquénSan Martin de los AndesJulian Uriel Collado
227686825/03/2025ArgentinaNeuquénLago Lácar - Costanera, San Martin de los AndesJulian Uriel Collado
191205410/11/2023ArgentinaNeuquénLaguna Rosales, San Martin de los AndesHernán Tolosa
171860407/02/2023ArgentinaNeuquénLaguna Rosales, San Martin de los AndesNicolas Olejnik
173077527/12/2022ArgentinaNeuquénLaguna Rosales, San Martin de los AndesFernando Naifleisch
163526329/08/2022ArgentinaNeuquénLaguna Rosales, San Martin de los Andes2Gabriel Carbajales
156079620/03/2022ArgentinaNeuquénLaguna Rosales, San Martin de los AndesNicolas Olejnik
153943528/01/2022ArgentinaNeuquénSan Martin de los AndesNicolas Olejnik
136382202/02/2021ArgentinaNeuquénSan Martin de los AndesNicolas Olejnik
141923513/01/2021ArgentinaNeuquénLaguna Rosales, San Martin de los Andes1Gabriel Carbajales
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 13/03/2026.