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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 La Pampa

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: 673288
  Adult

Dto Lihuel Calel
La Pampa
Argentina
02/15/2026
Hugo Alberto Valderrey
Foto
Photography ID: 648855
  Adult

Departamento Utracan
La Pampa
Argentina
08/22/2025
Hugo Alberto Valderrey
Foto
Photography ID: 646102
  Adult

Departamento de Toay
La Pampa
Argentina
07/31/2025
Hugo Alberto Valderrey
Foto
Photography ID: 642456
  Adult

Carro Quemado
La Pampa
Argentina
08/01/2014
Fernando Rasmussen
Foto
Photography ID: 642454
  Adult

Carro Quemado
La Pampa
Argentina
08/01/2014
Fernando Rasmussen
Foto
Photography ID: 640478
  Adult

Dto Lihuel Calel
La Pampa
Argentina
06/22/2025
Hugo Alberto Valderrey
Foto
Photography ID: 638763
  Adult

Departamento Utracan
La Pampa
Argentina
06/08/2025
Hugo Alberto Valderrey
Foto
Photography ID: 636145
  Adult

Realico
La Pampa
Argentina
05/14/2025
Hugo Alberto Valderrey
Foto
Photography ID: 632207
  Adult

Dto Lihuel Calel
La Pampa
Argentina
04/17/2025
Hugo Alberto Valderrey
Foto
Photography ID: 626755
  Juvenile

Parque Nacional Lihué Calel
La Pampa
Argentina
03/02/2025
Silvio Lamothe



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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
243597517/02/2026ArgentinaLa PampaRuta 152 (entre el carancho y Lihue Calel)Fernanda Ferrari
243389815/02/2026ArgentinaLa PampaParque Nacional Lihué Calel, Dto Lihuel CalelHugo Alberto Valderrey
241932321/01/202613:30ArgentinaLa PampaRuta Nacional 35 1931Patricia Beatriz Benitez
241892221/01/202610:23ArgentinaLa PampaRuta Nacional 5 5641Patricia Beatriz Benitez
241517005/01/2026ArgentinaLa PampaCaleu caleu1Tiziano Luka Pesci Rubilar
234785322/08/2025ArgentinaLa PampaCercanías a Colonia Devoto, Departamento UtracanHugo Alberto Valderrey
233122831/07/2025ArgentinaLa PampaReserva Provincial Parque Luro, Departamento de ToayHugo Alberto Valderrey
232589425/07/202516:20ArgentinaLa PampaRuta Nacional 188 5011Santiago Juan Torres
230830522/06/2025ArgentinaLa PampaParque Nacional Lihué Calel, Dto Lihuel CalelHugo Alberto Valderrey
230437008/06/2025ArgentinaLa PampaCercanías a Colonia Devoto, Departamento UtracanHugo Alberto Valderrey
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 30/03/2026.