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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 Chile

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: 653770
  Adult

Curacautín
Región de la Araucanía
Chile
02/22/2025
Fernando Naifleisch
Foto
Photography ID: 645054
  Adult

Camino a Farellones
Región Metropolitana
Chile
07/14/2025
Diego Oscar
Foto
Photography ID: 617555
  Adult

Punta Puyai
Región de Valparaíso
Chile
12/31/2024
Manuel Godoy
Foto
Photography ID: 493102
  Adult

Los Vilos
Región de Coquimbo
Chile
01/13/2006
Manuel Godoy
Foto
Photography ID: 307972
  Juvenile

Parque Mahuida
Región Metropolitana
Chile
01/12/2018
Pablo Moya Arias
Foto
Photography ID: 269389
  Juvenile

Los andes
Región de Valparaíso
Chile
02/20/2018
Jorge Schlemmer
Foto
Photography ID: 245781
  Adult

Frutillar
Región de Los Lagos
Chile
01/27/2018
Mariano Costa
Foto
Photography ID: 233730
  Adult

Santiago de chile
Región Metropolitana
Chile
11/17/2017
Eduardo Nadal
Foto
Photography ID: 161169
  Adult

Cerro San Cristóbal
Región Metropolitana
Chile
07/28/2016
Eugenia Boggiano
Foto
Photography ID: 144904
  Juvenile

Mallín Grande
Región de Aisén
Chile
03/20/2016
Nicolas Chimento



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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
241919310/01/202616:00ChileRegión de ValparaísoLa Calera1José Aparicio
235691811/09/202517:10ChileRegión de Los LagosCostanera Pedro Montt 89, QuellónMariano Costa
232675514/07/2025ChileRegión MetropolitanaCamino a Valle Nevado (entre Farellones y Valle Nevado)2Diego Oscar
232675314/07/2025ChileRegión MetropolitanaCamino a Farellones1Diego Oscar
236831822/02/2025ChileRegión de la AraucaníaLo de Palma, CuracautínFernando Naifleisch
223024331/12/2024ChileRegión de ValparaísoPunta PuyaiManuel Godoy
211771620/07/2024ChileRegión del MauleConstitución1Bc_pajareritos Nucologos
211713020/07/2024ChileRegión del MauleConstitución1Matías Melgarejo
195412411/01/2024ChileRegión de Los LagosAncud, ChiloéSamuel Ernesto Olivieri Bornand
155858110/03/2022ChileRegión de Los LagosParque Tepuhueico2Nicolas Olejnik
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.