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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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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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Latest feeding records




Last published photographs

Foto
Photography ID: 636812
  Adult

Collón Cura
Neuquén
Argentina
04/05/2025
Hernán Tolosa
Foto
Photography ID: 581613
  Immature

Parque Nacional Lihué Calel
La Pampa
Argentina
04/21/2024
Hernán Tolosa
Foto
Photography ID: 556396
  Adult

Parque Nacional Laguna Blanca
Neuquén
Argentina
11/02/2023
Hernán Tolosa
Foto
Photography ID: 556216
  Juvenile

Parque Nacional El Leoncito
San Juan
Argentina
10/27/2023
Hernán Tolosa
Foto
Photography ID: 517507
  Juvenile

Bahía Rosas
Río Negro
Argentina
12/10/2022
Hernán Tolosa
Foto
Photography ID: 517498
♂ ♀
  Adult

Faro Belen
Río Negro
Argentina
12/10/2022
Hernán Tolosa
Foto
Photography ID: 441240
  Adult

Ruta 40 (el Marucho)
Neuquén
Argentina
04/10/2021
Hernán Tolosa
Foto
Photography ID: 440772
  Adult

Parque Nacional Laguna Blanca
Neuquén
Argentina
04/03/2021
Hernán Tolosa
Foto
Photography ID: 294309
  Adult

Parque Nacional Lanín
Neuquén
Argentina
10/19/2018
Hernán Tolosa



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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
241250814/12/2025ArgentinaSanta CruzTellierHernán Tolosa
241249714/12/2025ArgentinaChubutRada TillyHernán Tolosa
241247212/12/2025ArgentinaRío NegroLas Grutas, Las GrutasHernán Tolosa
229468305/04/2025ArgentinaNeuquénRuta 234, Collón CuraHernán Tolosa
226867828/03/2025ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
222954901/12/2024ArgentinaChubutPampa de Agnia, Ruta Nacional 251Hernán Tolosa
202654521/04/2024ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
213417013/04/2024ArgentinaNeuquénCerrito Piñon, Valle del Rio Collon CuraHernán Tolosa
191200012/11/2023ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
191205410/11/2023ArgentinaNeuquénLaguna Rosales, San Martin de los AndesHernán Tolosa
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 17/03/2026.