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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 Lihué Calel

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: 581613
  Immature

Parque Nacional Lihué Calel
La Pampa
Argentina
04/21/2024
Hernán Tolosa
Foto
Photography ID: 125217
  Immature

Parque Nacional Lihué Calel
La Pampa
Argentina
11/08/2015
Hernán Tolosa
Foto
Photography ID: 93366
  Juvenile

Parque Nacional Lihué Calel
La Pampa
Argentina
04/05/2015
Hernán Tolosa
Foto
Photography ID: 93013
  Juvenile

Parque Nacional Lihué Calel
La Pampa
Argentina
03/26/2015
Hernán Tolosa



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 Reports


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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
226867828/03/2025ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
202654521/04/2024ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
191200012/11/2023ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
150417420/11/2021ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
140324102/04/2021ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
82442112/10/2018ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
56399308/04/2017ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
42831108/11/2015ArgentinaLa PampaCamino hacia el Valle de Los Angelitos, Parque Nacional Lihué CalelHernán Tolosa
26923305/04/2015ArgentinaLa PampaValle de los Angelitos, Parque Nacional Lihué CalelHernán Tolosa
26810127/03/2015ArgentinaLa PampaParque Nacional Lihué CalelHernán Tolosa
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 18/04/2026.