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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 Parque Nacional Talampaya

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: 509119
  Adult

Parque Nacional Talampaya
La Rioja
Argentina
09/05/2022
Diego Alfonso Rosa
Foto
Photography ID: 496751
  Adult

Parque Nacional Talampaya
La Rioja
Argentina
03/31/2022
Silvio Lamothe
Foto
Photography ID: 435183
  Adult

Parque Nacional Talampaya
La Rioja
Argentina
02/16/2021
Carlos De Biagi
Foto
Photography ID: 426402
  Adult

Parque Nacional Talampaya
La Rioja
Argentina
12/25/2020
Jorge Schlemmer
Foto
Photography ID: 345954
  Adult

Parque Nacional Talampaya
La Rioja
Argentina
07/09/2019
Walter Bustamante
Foto
Photography ID: 308655
  Immature

Parque Nacional Talampaya
La Rioja
Argentina
11/17/2018
Elsa Longo
Foto
Photography ID: 306200
  Adult

Parque Nacional Talampaya
La Rioja
Argentina
12/18/2018
Carlos De Biagi
Foto
Photography ID: 306199
  Adult

Parque Nacional Talampaya
La Rioja
Argentina
12/18/2018
Carlos De Biagi
Foto
Photography ID: 277933
  Adult

Parque Nacional Talampaya
La Rioja
Argentina
07/15/2018
Ramón Alberto Sosa



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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
164705105/09/2022ArgentinaLa RiojaParque Nacional TalampayaDiego Alfonso Rosa
159606031/03/2022ArgentinaLa RiojaParque Nacional TalampayaSilvio Lamothe
137334716/02/2021ArgentinaLa RiojaParque Nacional TalampayaCarlos De Biagi
133822025/12/2020ArgentinaLa RiojaAcceso, Parque Nacional TalampayaJorge Schlemmer
96064009/07/2019ArgentinaLa RiojaParque Nacional TalampayaWalter Bustamante
91529919/04/2019ArgentinaLa RiojaParque Nacional Talampaya1Gonzalo Camiletti
90531101/04/2019ArgentinaLa RiojaAlrededores de la entrada y cañón, Parque Nacional Talampaya1Dario Juan Wendeler
85839318/12/2018ArgentinaLa RiojaParque Nacional TalampayaCarlos De Biagi
86372417/11/2018ArgentinaLa RiojaParque Nacional TalampayaElsa Longo
78471515/07/2018ArgentinaLa RiojaParque Nacional TalampayaRamón Alberto Sosa
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 13/03/2026.