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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 San Julián

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: 630448
  Adult

Puerto San Julián
Santa Cruz
Argentina
02/04/2025
Elsa Longo
Foto
Photography ID: 127392
  Adult

Puerto San Julián
Santa Cruz
Argentina
05/02/2015
José Raúl Fernández
Foto
Photography ID: 127173
  Juvenile

Puerto San Julián
Santa Cruz
Argentina
11/28/2015
José Raúl Fernández



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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
227324704/02/2025ArgentinaSanta CruzCircuito costero, Puerto San JuliánElsa Longo
172894014/02/2023ArgentinaSanta CruzPuerto San Julián1Guillermo Enrique Rost
90001923/01/2019ArgentinaSanta CruzPuerto San Julián2Guillermo Enrique Rost
36870928/11/2015ArgentinaSanta CruzPlaya la mina, Puerto San JuliánJosé Raúl Fernández
36932102/05/2015ArgentinaSanta CruzPlaya la mina, Puerto San JuliánJosé Raúl Fernández
10691117/01/2014ArgentinaSanta CruzPuerto San JuliánSergio Giovanelli
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 13/03/2026.