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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 Catan lil

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: 396657
  Juvenile

Catan lil
Neuquén
Argentina
02/19/2020
Gustavo Castaing
Foto
Photography ID: 252938
  Adult

Catan lil
Neuquén
Argentina
02/21/2018
Eduardo Cusano
Foto
Photography ID: 239904
  Juvenile

Catan lil
Neuquén
Argentina
01/09/2018
Adriana Bellotti
Foto
Photography ID: 188076
  Adult

Catan lil
Neuquén
Argentina
01/08/2017
Adriana Bellotti
Foto
Photography ID: 82546
  Juvenile

Catan lil
Neuquén
Argentina
02/08/2015
Adriana Bellotti
Foto
Photography ID: 75016
  Adult

Catan lil
Neuquén
Argentina
01/03/2015
Adriana Bellotti
Foto
Photography ID: 37109
  Adult

Catan lil
Neuquén
Argentina
01/25/2014
Eduardo Cusano
Foto
Photography ID: 33633
  Adult

Catan lil
Neuquén
Argentina
01/12/2014
Adriana Bellotti



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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
123967419/02/2020ArgentinaNeuquénRuta 40, Catan lilGustavo Castaing
119221312/02/2020ArgentinaNeuquénCatan lilAdriana Bellotti
71117521/02/2018ArgentinaNeuquénCatan lilEduardo Cusano
67531009/01/2018ArgentinaNeuquénCatan lilAdriana Bellotti
63586531/10/2017ArgentinaNeuquénCatan lilAdriana Bellotti
53687708/01/2017ArgentinaNeuquénCatan lilAdriana Bellotti
42974808/02/2015ArgentinaNeuquénCatan lilAdriana Bellotti
21936303/01/2015ArgentinaNeuquénCatan lilAdriana Bellotti
10677425/01/2014ArgentinaNeuquénRuta Provincial 23, Catan lilEduardo Cusano
9584612/01/2014ArgentinaNeuquénCatan lilAdriana Bellotti
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 14/03/2026.