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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 Humahuaca

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: 613429
  Adult

Humahuaca
Jujuy
Argentina
11/10/2024
Carlos Valpreda
Foto
Photography ID: 550220
  Immature

Humahuaca
Jujuy
Argentina
09/21/2023
Héctor Bernardo Fernández
Foto
Photography ID: 366288
  Immature

Humahuaca
Jujuy
Argentina
11/23/2019
Gustavo Castaing



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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
220657010/11/2024ArgentinaJujuyRp 73 entre Humahuaca y Serranía del hornocal, Humahuaca1Carlos Valpreda
189077721/09/2023ArgentinaJujuyRuta entre Humahuaca y Abrapampa, HumahuacaHéctor Bernardo Fernández
186930618/01/2023ArgentinaJujuyRuta Nacional 9, Humahuaca1Fabricio Candia
114267023/11/2019ArgentinaJujuyCamino al Hornocal, HumahuacaGustavo Castaing
47154419/08/2016ArgentinaJujuyHumahuaca3Elsa Longo
16718610/08/2014ArgentinaJujuyHumahuacaDiego Oscar
105951511/01/2013ArgentinaJujuyHumahuaca, Humahuaca4Julian Quillen Vidoz
4082804/09/2012ArgentinaJujuyHumahuacaJorge La Grotteria
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 14/03/2026.