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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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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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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
240164522/09/2025PeruCuzcoUnnamed Road, Qosqo, Pe1Julian Uriel Collado
240163322/09/2025PeruCuzcoSacred garden, San salvador1Julian Uriel Collado
226929029/03/202517:08ArgentinaLa PampaRuta Provincial 20 284Julian Uriel Collado
226928929/03/202517:06ArgentinaLa PampaRuta Provincial 20Julian Uriel Collado
229722926/03/2025ArgentinaNeuquénSan Martin de los AndesJulian Uriel Collado
227686825/03/2025ArgentinaNeuquénLago Lácar - Costanera, San Martin de los AndesJulian Uriel Collado
226543323/03/202514:26ArgentinaRío NegroRuta Nacional 231Julian Uriel Collado
226543223/03/202514:19ArgentinaRío NegroAime Paine 512, Pilcaniyeu1Julian Uriel Collado
226490421/03/202509:12ArgentinaNeuquénRuta Nacional 237 1505-1507Julian Uriel Collado
202919630/04/2024ArgentinaCatamarcaRuta Provincial 33 (-29,025862, -65,760620)Julian Uriel Collado
Page 1

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Citation recommended:

EcoRegistros. 2026. Variable Hawk (Geranoaetus polyosoma) - Species sheet. Acceded from https://www.ecoregistros.org on 25/03/2026.