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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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Last published photographs

Foto
Photography ID: 397283
  Adult

Ruta Nacional 9
Jujuy
Argentina
06/25/2019
Julián Tocce
Foto
Photography ID: 382534
  Juvenile

El Cuy
Río Negro
Argentina
02/16/2020
Julián Tocce
Foto
Photography ID: 244560
  Juvenile

El Cuy
Río Negro
Argentina
01/31/2018
Julián Tocce
Foto
Photography ID: 188692
  Adult

Ruta Nacional 23
Río Negro
Argentina
02/03/2017
Julián Tocce
Foto
Photography ID: 92162
  Juvenile

Las Grutas
Río Negro
Argentina
03/24/2015
Julián Tocce
Foto
Photography ID: 40604
  Adult

Parque Nacional Perito Moreno
Santa Cruz
Argentina
02/08/2014
Julián Tocce
Foto
Photography ID: 23186
  Adult

El Cain - Meseta de Somuncura
Río Negro
Argentina
05/19/2013
Julián Tocce



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 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
195049415/01/2024ArgentinaNeuquénNaciente del río Chimehuín, Parque Nacional Lanín1Julián Tocce
175636822/04/2023ArgentinaRío NegroSalto Andersen ruta prov 57, Salto Andersen1Julián Tocce
173481516/03/2023ArgentinaChubutRuta Provincial 281Julián Tocce
165023326/09/2022ArgentinaCórdobaRuta 34, Parque Nacional Quebrada del Condorito1Julián Tocce
164844022/09/2022ArgentinaSan LuisReserva Natural Estricta Quebrada de las Higueritas1Julián Tocce
156614926/03/2022ArgentinaLa PampaCostado de la ruta, Camino al Parque Nacional Lihué Calel1Julián Tocce
153295909/01/2022ArgentinaRío NegroGeneral Conesa1Julián Tocce
137117505/02/2021ArgentinaRío NegroAcantilado, Área Natural Protegida Reserva Faunística Punta Bermeja1Julián Tocce
119476816/02/2020ArgentinaRío NegroEntre El Cuy y la Esperanza, El CuyJulián Tocce
124084025/06/2019ArgentinaJujuyCruce con el Río Tres Cruces, Ruta Nacional 92Julián Tocce
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 16/03/2026.