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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 Lima

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: 457460
  Adult

Huarochiri
Lima
Peru
06/13/2021
Brandon Ortiz Arenas
Foto
Photography ID: 390482
  Immature

Central Hidroeléctrica de Huanza
Lima
Peru
03/05/2020
Rutger Koperdraad
Foto
Photography ID: 355901
  Juvenile

Huarochiri
Lima
Peru
10/09/2019
Rutger Koperdraad
Foto
Photography ID: 335321
  Adult

Bosque de Zárate
Lima
Peru
06/01/2019
Rutger Koperdraad
Foto
Photography ID: 207880
  Juvenile

Lomas de Lachay
Lima
Peru
06/25/2017
Rutger Koperdraad
Foto
Photography ID: 170040
  Immature

Lomas de Asia
Lima
Peru
09/18/2016
Alec Earnshaw
Foto
Photography ID: 150242
  Adult

Yauyos
Lima
Peru
05/14/2016
Rutger Koperdraad
Foto
Photography ID: 96727
  Adult

Lomas de Lachay
Lima
Peru
05/03/2015
Rutger Koperdraad



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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
144694913/06/2021PeruLimaSan jeronimo de surco, HuarochiriBrandon Ortiz Arenas
122946405/03/2020PeruLimaCentral Hidroeléctrica de HuanzaRutger Koperdraad
111792719/10/2019PeruLimaBosque de Queñuales, Quichas, OyónRutger Koperdraad
110927009/10/2019PeruLimaAntioquía, HuarochiriRutger Koperdraad
97227931/08/2019PeruLimaValle de Santa EulaliaPablo Eguia
96916023/08/2019PeruLimaLaguna MillocPablo Eguia
96348117/08/2019PeruLimaQuebrada Yanac (bosque Polylepis)Rutger Koperdraad
105956614/08/2019PeruLimaValle de Santa Eulalia--SuperiorJulian Quillen Vidoz
92940201/06/2019PeruLimaBosque de ZárateRutger Koperdraad
105955820/11/2018PeruLimaRN Lomas de Lachay1Julian 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 16/03/2026.