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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 Rawson

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: 428171
  Adult

Rawson
Chubut
Argentina
01/05/2021
Zulima América Schupbach
Foto
Photography ID: 352036
  Juvenile

Rawson
Chubut
Argentina
09/05/2019
Zulima América Schupbach
Foto
Photography ID: 352035
  Juvenile

Rawson
Chubut
Argentina
09/05/2019
Zulima América Schupbach
Foto
Photography ID: 344018
  Adult

Rawson
Chubut
Argentina
07/25/2019
Zulima América Schupbach
Foto
Photography ID: 340624
 
Rawson
Chubut
Argentina
01/15/2019
Jorgelina Lopez
Foto
Photography ID: 315423
  Juvenile

Rawson
Chubut
Argentina
01/15/2019
Zulima América Schupbach
Foto
Photography ID: 315422
  Juvenile

Rawson
Chubut
Argentina
01/15/2019
Zulima América Schupbach
Foto
Photography ID: 315421
  Juvenile

Rawson
Chubut
Argentina
01/15/2019
Zulima América Schupbach
Foto
Photography ID: 313223
  Juvenile

Rawson
Chubut
Argentina
01/07/2019
Zulima América Schupbach
Foto
Photography ID: 313222
  Juvenile

Rawson
Chubut
Argentina
01/07/2019
Zulima América Schupbach



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Last Vocalizations published




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Last Filmings published


Video ID: 4206
 
Rawson
Chubut
Argentina
01/15/2019
Jorgelina Lopez



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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
134552705/01/2021ArgentinaChubutPlaya El Sombrerito, Rawson1Zulima América Schupbach
102830805/09/2019ArgentinaChubutPlaya Magagna, RawsonZulima América Schupbach
95442025/07/2019ArgentinaChubutPlaya El Sombrerito, RawsonZulima América Schupbach
94384415/01/2019ArgentinaChubutPlaya Santa Isabel, RawsonJorgelina Lopez
88412815/01/2019ArgentinaChubutPlaya Santa Isabel, RawsonZulima América Schupbach
87661307/01/2019ArgentinaChubutPlaya Santa Isabel, RawsonZulima América Schupbach
105952306/12/2015ArgentinaChubutLaguna Negra, RawsonJulian Quillen Vidoz
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.