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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 Santa Cruz

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: 674044
  Adult

Parque Patagonia
Santa Cruz
Argentina
01/24/2026
Gustavo Daniel González
Foto
Photography ID: 630448
  Adult

Puerto San Julián
Santa Cruz
Argentina
02/04/2025
Elsa Longo
Foto
Photography ID: 574581
  Juvenile

Departamento Güer Aike
Santa Cruz
Argentina
02/21/2017
Manuel Godoy
Foto
Photography ID: 573714
  Adult

Cabo blanco
Santa Cruz
Argentina
02/19/2024
Ariel Alejandro Vazquez
Foto
Photography ID: 573059
  Adult

Parque Nacional Patagonia
Santa Cruz
Argentina
01/20/2024
Santos Uranga
Foto
Photography ID: 537519
  Juvenile

Puerto Deseado
Santa Cruz
Argentina
03/11/2023
Santos Di Mauro
Foto
Photography ID: 537517
  Adult

Puerto Deseado
Santa Cruz
Argentina
03/11/2023
Santos Di Mauro
Foto
Photography ID: 516009
  Adult

Estancia Laguna Verde
Santa Cruz
Argentina
01/27/2022
Andrés Cecconi
Foto
Photography ID: 515988
  Adult

Paraje La Leona
Santa Cruz
Argentina
01/26/2022
Andrés Cecconi
Foto
Photography ID: 511658
  Adult

Caleta Olivia
Santa Cruz
Argentina
10/22/2022
Hugo Alberto Valderrey
Foto
Photography ID: 511532
  Adult

Ruta 40
Santa Cruz
Argentina
10/17/2022
Hugo Alberto Valderrey



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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
243630024/01/2026ArgentinaSanta CruzCamping El Mollar, Parque PatagoniaGustavo Daniel González
241579905/01/2026ArgentinaSanta CruzY ruta 49, Ruta Nacional 3Jorgelina Lopez
241250814/12/2025ArgentinaSanta CruzTellierHernán Tolosa
239970114/12/2025ArgentinaSanta CruzTellierJorgelina Lopez
226999904/04/202516:19ArgentinaSanta CruzRuta Nacional 2881Nicolas Olejnik
226978704/04/202518:55ArgentinaSanta CruzRuta Nacional 3, Río Gallegos1Nicolas Olejnik
226884301/04/202517:22ArgentinaSanta CruzRuta Nacional 401Nicolas Olejnik
226880631/03/202518:54ArgentinaSanta CruzRuta Nacional 3 25431Nicolas Olejnik
227324704/02/2025ArgentinaSanta CruzCircuito costero, Puerto San JuliánElsa Longo
210938813/07/2024ArgentinaSanta CruzRuta Nacional 31Sebastián Alvarado
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 23/03/2026.