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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 Mendoza

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: 680112
  Adult

Villavicencio
Mendoza
Argentina
02/06/2026
Emilio Martin Perez
Foto
Photography ID: 679696
  Adult

Vallecitos. seccional guardaparques
Mendoza
Argentina
03/14/2026
Pablo Moreno
Foto
Photography ID: 679170
  Juvenile

Lujan de Cuyo
Mendoza
Argentina
02/23/2026
Diego Trillo
Foto
Photography ID: 679169
  Juvenile

Lujan de Cuyo
Mendoza
Argentina
02/23/2026
Diego Trillo
Foto
Photography ID: 678585
  Juvenile

Blanco encalada
Mendoza
Argentina
02/18/2026
Diego Trillo
Foto
Photography ID: 665890
  Adult

Alvear
Mendoza
Argentina
01/02/2026
Hugo Alberto Valderrey
Foto
Photography ID: 641295
  Adult

Las Heras
Mendoza
Argentina
06/16/2025
Damián Carnevale
Foto
Photography ID: 641239
  Juvenile

Malargüe
Mendoza
Argentina
01/11/2011
Fernando Rasmussen
Foto
Photography ID: 638863
♂ ♀
  Adult

Departamento las heras
Mendoza
Argentina
05/31/2025
Pablo Eguia
Foto
Photography ID: 638396
  Adult

Uspallata
Mendoza
Argentina
06/01/2025
Enrique Sanz
Foto
Photography ID: 637504
  Adult

La Paz
Mendoza
Argentina
06/04/2025
Manuel Godoy
Foto
Photography ID: 636468
  Adult

Carrizal de abajo
Mendoza
Argentina
05/11/2025
Pablo Moreno



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Last Vocalizations published



Audio playerUserDateCountryProvincePlaceSexLife stageIt was observedDetails
Emilio Martin Perez12/27/2019ArgentinaMendozaReserva Natural VillavicencioN/AAdultNoNo



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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
245629622/03/2026ArgentinaMendozaRuta Provincial 226, Mendoza, Ar3Pablo Moreno
245628622/03/2026ArgentinaMendozaRuta Provincial 226, Mendoza, Ar1Pablo Moreno
245282120/03/2026ArgentinaMendozaLaguna Coipo Lauquen1Hugo Caverzasi
245276414/03/2026ArgentinaMendozaVallecitos. seccional guardaparques1Pablo Moreno
245263514/03/2026ArgentinaMendozaVallecito, Mendoza, Ar (-32,981, -69,352)1Pablo Moreno
245345209/03/2026ArgentinaMendozaVillavicencio2Emilio Martin Perez
245132123/02/2026ArgentinaMendozaLas Compuertas, Lujan de CuyoDiego Trillo
244903418/02/2026ArgentinaMendozaBlanco encaladaDiego Trillo
243668617/02/2026ArgentinaMendozaCabañas san jose de Pemehue, San Rafael2Emilio Martin Perez
245358706/02/2026ArgentinaMendozaVillavicencioEmilio Martin Perez
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 11/04/2026.