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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 Cerro Catedral

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: 485387
  Immature

San Carlos de Bariloche
Río Negro
Argentina
02/13/2018
Horacio Alberto Garcia
Foto
Photography ID: 240305
  Adult

San Carlos de Bariloche
Río Negro
Argentina
01/12/2018
Iván Eroles
Foto
Photography ID: 80616
  Adult

San Carlos de Bariloche
Río Negro
Argentina
02/02/2015
Diana Weyland



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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
154680002/02/2022ArgentinaRío NegroCerro Catedral, San Carlos de Bariloche1Pablo Bruni
155671613/02/2018ArgentinaRío NegroCerro Catedral, San Carlos de BarilocheHoracio Alberto Garcia
67628412/01/2018ArgentinaRío NegroCerro Catedral, San Carlos de BarilocheIván Eroles
49286421/10/2016ArgentinaRío NegroCerro Catedral, San Carlos de BarilocheUlises Balza
23582502/02/2015ArgentinaRío NegroCerro Catedral, San Carlos de BarilocheDiana Weyland
22590116/01/2015ArgentinaRío NegroCerro Catedral, San Carlos de BarilocheGuillermo Enrique Rost
21642931/12/2014ArgentinaRío NegroCerro Catedral, San Carlos de BarilocheDiana Weyland
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.