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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: 239904
  Juvenile

Catan lil
Neuquén
Argentina
01/09/2018
Adriana Bellotti
Foto
Photography ID: 226318
  Adult

La Negra
Neuquén
Argentina
10/24/2017
Adriana Bellotti
Foto
Photography ID: 188076
  Adult

Catan lil
Neuquén
Argentina
01/08/2017
Adriana Bellotti
Foto
Photography ID: 82546
  Juvenile

Catan lil
Neuquén
Argentina
02/08/2015
Adriana Bellotti
Foto
Photography ID: 80646
  Adult

Sierra Nevada
Región de la Araucanía
Chile
02/03/2015
Adriana Bellotti
Foto
Photography ID: 75016
  Adult

Catan lil
Neuquén
Argentina
01/03/2015
Adriana Bellotti
Foto
Photography ID: 33633
  Adult

Catan lil
Neuquén
Argentina
01/12/2014
Adriana Bellotti



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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
136333831/01/2021ArgentinaNeuquénÁrea Tromen, Parque Nacional Lanín1Adriana Bellotti
136330430/01/2021ArgentinaNeuquénHerraduras al huechulafquen2Adriana Bellotti
136324523/01/2021ArgentinaNeuquénLaguna Palau Mahuida1Adriana Bellotti
134906114/01/2021ArgentinaNeuquénEntre Las Coloradas y Ruta Nacional 40, Ruta Provincial 562Adriana Bellotti
119560915/02/2020ChileRegión de la AraucaníaPuerto Saavedra1Adriana Bellotti
119221312/02/2020ArgentinaNeuquénCatan lilAdriana Bellotti
116686610/01/2020ArgentinaNeuquénRamón Castro1Adriana Bellotti
116684510/01/2020ArgentinaNeuquénMichacheo, ZapalaAdriana Bellotti
116664210/01/2020ArgentinaNeuquénRuta 40, Estancia La Negra1Adriana Bellotti
115929904/01/2020ArgentinaNeuquénEl Cristo, ZapalaAdriana Bellotti
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 29/03/2026.