Don't want to see ads? Sign up...





Species icon
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

 Request change
Filters


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




Loading map...

Latest feeding records




Last published photographs

Foto
Photography ID: 396203
  Juvenile

Playa Acina
Santa Cruz
Argentina
01/23/2020
Román Montero
Foto
Photography ID: 314514
  Adult

Reserva Natural Villavicencio
Mendoza
Argentina
01/16/2019
Román Montero
Foto
Photography ID: 187701
  Adult

Puerto Madryn
Chubut
Argentina
01/19/2017
Román Montero



 View all photographs of the species




 Add a photography of this species





Last Vocalizations published




 Add an audio of this species





Last Filmings published




 Add a film of this species





 Reports


 Detail of places sorted by number of records








Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
242283623/01/2026ArgentinaBuenos AiresSan Clemente del Tuyú1Román Montero
118118325/01/2020ArgentinaBuenos AiresRn 3, Km 3251Román Montero
118113523/01/2020ArgentinaSanta CruzPlaya Acina3Román Montero
118110822/01/2020ArgentinaChubutReserva Privada Los VagonesRomán Montero
118101921/01/2020ArgentinaSanta CruzReserva Provincial Península San Julián1Román Montero
117990421/01/2020ArgentinaSanta CruzRn 3, Km 2540Román Montero
117988421/01/2020ArgentinaSanta CruzPunta Loyola1Román Montero
117986021/01/2020ArgentinaSanta CruzEx Rn 40, hacia Punta LoyolaRomán Montero
117979120/01/2020ArgentinaSanta CruzReserva Geológica Provincial Laguna Azul (campo Volcánico Pan y Aike)1Román Montero
117886712/01/2020ArgentinaChubutRn 3, Km 1472Román Montero
Page 1

 Add a record of this species

Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 25/03/2026.