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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




Number of Photography: 1866

Foto
Photography ID: 676544
  Adult

Bahía Bustamante
Chubut
Argentina
01/04/2026
Gustavo Daniel González
Foto
Photography ID: 674044
  Adult

Parque Patagonia
Santa Cruz
Argentina
01/24/2026
Gustavo Daniel González
Foto
Photography ID: 673777
  Fledgling

Parque Nacional Nahuel Huapi
Neuquén
Argentina
01/06/2026
Andrea Casaburi
Foto
Photography ID: 673773
  Adult

Parque Nacional Nahuel Huapi
Neuquén
Argentina
01/06/2026
Andrea Casaburi
Foto
Photography ID: 673771
  Adult

Parque Nacional Nahuel Huapi
Neuquén
Argentina
01/06/2026
Andrea Casaburi
Foto
Photography ID: 673288
  Adult

Dto Lihuel Calel
La Pampa
Argentina
02/15/2026
Hugo Alberto Valderrey
Foto
Photography ID: 672237
  Adult

Andalgalá
Catamarca
Argentina
02/04/2026
Hugo Alberto Valderrey
Foto
Photography ID: 670586
 
Santa María
Catamarca
Argentina
05/16/2014
Viviana Fuentes
Foto
Photography ID: 670181
♂ ♀
  Adult

Cafayate
Salta
Argentina
01/28/2026
Viviana Fuentes



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Number of Recorded Vocalizations: 3



Audio playerUserDateCountryProvincePlaceSexLife stageIt was observedDetails
Diego Oscar07/31/2024ArgentinaSaltaValle de LermaN/AN/AYesNo
Emilio Martin Perez12/27/2019ArgentinaMendozaReserva Natural VillavicencioN/AAdultNoNo
Santiago Sainz-trápaga04/29/2014ArgentinaChubutPunta DelgadaÁrea Natural Protegida Península ValdésIndistinguishableJuvenileYesNo


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Number of Films: 14





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 Reports


 Detail of places sorted by number of records






Number of Records: 4096



Page 1 of 410
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
244319606/03/2026ArgentinaCórdobapuentes colgantes de Copina, Copina1Hugo Caverzasi
244318606/03/2026ArgentinaCórdobaLagunas Rp34, Altas cumbres1Hugo Caverzasi
244316206/03/2026ArgentinaCórdobaCamino a Paso de Piedra, Altas cumbres1Hugo Caverzasi
244106301/03/202611:55ArgentinaBuenos AiresRuta Provincial 2271Santiago Juan Torres
243611219/02/2026ArgentinaNeuquénReserva Natural Urbana CotesmaNicolas Olejnik
243581618/02/2026ArgentinaNeuquénLaguna rosales, Parque Nacional LanínNicolas Olejnik
243668617/02/2026ArgentinaMendozaCabañas san jose de Pemehue, San Rafael2Emilio Martin Perez
243597517/02/2026ArgentinaLa PampaRuta 152 (entre el carancho y Lihue Calel)Fernanda Ferrari
243519517/02/2026ArgentinaNeuquénLago Curruhue Grande, Parque Nacional Lanín2Nicolas Olejnik
243818415/02/2026ArgentinaChubutÁrea Natural Protegida Península ValdésDolores Fernandez
Page 1 of 410

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 10/03/2026.