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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 Región de Valparaíso

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: 617555
  Adult

Punta Puyai
Región de Valparaíso
Chile
12/31/2024
Manuel Godoy
Foto
Photography ID: 269389
  Juvenile

Los andes
Región de Valparaíso
Chile
02/20/2018
Jorge Schlemmer
Foto
Photography ID: 71068
  Adult

Caracoles libertadores
Región de Valparaíso
Chile
12/03/2014
Carlos Schmidt



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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
223024331/12/2024ChileRegión de ValparaísoPunta PuyaiManuel Godoy
76605420/02/2018ChileRegión de ValparaísoLos andesJorge Schlemmer
69130901/02/2018ChileRegión de ValparaísoQuinterosEmilio Martin Perez
40182331/01/2016ChileRegión de ValparaísoReserva Nacional Lago Peñuelas, Peñuelas1Luis Fernandez Campos
24670421/02/2015ChileRegión de ValparaísoJardin Botanico, Viña del MarDiego Oscar
22250102/01/2015ChileRegión de ValparaísoPlaya Las Docas, Laguna VerdeAna Tobar
20641603/12/2014ChileRegión de ValparaísoCaracoles libertadoresCarlos Schmidt
191743704/08/2006ChileRegión de ValparaísoEl Tabo, Santuario de la Naturaleza Laguna el Peral1Manuel Godoy
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 15/03/2026.