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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 Puerto Madryn

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: 504343
  Juvenile

Puerto Madryn
Chubut
Argentina
08/12/2022
Juan Manuel Canepa
Foto
Photography ID: 504342
  Adult

Puerto Madryn
Chubut
Argentina
08/12/2022
Juan Manuel Canepa
Foto
Photography ID: 387500
  Adult

Puerto Madryn
Chubut
Argentina
03/01/2020
Dolores Fernandez
Foto
Photography ID: 307385
♂ ♀
  Adult

Puerto Madryn
Chubut
Argentina
03/11/2018
Zulima América Schupbach
Foto
Photography ID: 307384
♂ ♀
  Adult

Puerto Madryn
Chubut
Argentina
03/11/2018
Zulima América Schupbach
Foto
Photography ID: 307383
  Adult

Puerto Madryn
Chubut
Argentina
03/11/2018
Zulima América Schupbach
Foto
Photography ID: 253746
  Immature

Puerto Madryn
Chubut
Argentina
03/07/2018
Dolores Fernandez
Foto
Photography ID: 187701
  Adult

Puerto Madryn
Chubut
Argentina
01/19/2017
Román Montero
Foto
Photography ID: 160713
  Adult

Puerto Madryn
Chubut
Argentina
07/26/2016
Susana Gomez
Foto
Photography ID: 151679
  Adult

Puerto Madryn
Chubut
Argentina
05/22/2016
Cesar D Agostino
Foto
Photography ID: 95662
  Juvenile

Puerto Madryn
Chubut
Argentina
01/05/2015
Santiago Sainz-trápaga
Foto
Photography ID: 62028
  Juvenile

Puerto Madryn
Chubut
Argentina
04/05/2014
Santiago Sainz-trápaga



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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
212578016/07/2024ArgentinaChubutplaya parana, Puerto Madryn1Rodolfo Domnanovich
178282117/06/2023ArgentinaChubutRuta Provincial 2, Puerto MadrynGisela Ballent
177882417/06/2023ArgentinaChubutRuta Provincial 2, Puerto MadrynSantiago Juan Torres
173903427/02/2023ArgentinaChubutRuta Provincial 2, Puerto Madryn1Sebastián Otero
189558724/02/2023ArgentinaChubutPlaya El Doradillo Bajada 2, Puerto Madryn1Sebastián Otero
166228524/10/2022ArgentinaChubutAcceso A Aeropuerto Puerto Madryn u9120, Puerto Madryn1Silvia Ana González
162747612/08/2022ArgentinaChubutRuta Nac 3, Puerto MadrynJuan Manuel Canepa
162666212/08/2022ArgentinaChubutRuta Nac 3, Puerto MadrynJuan Manuel Canepa
152337426/12/2021ArgentinaChubutPuerto MadrynGonzalo Camiletti
150379524/11/2021ArgentinaChubutRuta Provincial 42, Puerto Madryn1Jorge La Grotteria
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 14/03/2026.