Introduction
The Ashy-headed Goose (Chloephaga poliocephala) is a small South American sheldgoose in the family Anatidae. It occurs mainly in southern Chile and Argentina, where it uses wetlands, grasslands, open woodland and forest-edge habitats. It is partly migratory, with some birds moving north during the austral winter. (datazone.birdlife.org)
Physical Description
The Ashy-headed Goose is a medium-sized sheldgoose, measuring about 45 cm in length. Adults have a grey or ash-coloured head and neck, a black, conical bill, a chestnut-brown breast, a white belly and dark barring concentrated on the flanks. The wings show a conspicuous pale or white pattern in flight, while the legs are yellowish to pinkish. (sib.gob.ar)
The sexes are broadly similar in plumage, unlike the strongly contrasting sexes of some related sheldgeese. Females may be slightly smaller and duller than males, but head colour, chestnut breast and white belly are shared by both sexes. Juveniles are browner overall, with a duller head and wing pattern and more extensive barring on the back, breast and flanks. (waterfowl.org.uk)
Range and Habitat
The species is native to southern Chile and southern Argentina, including Patagonia and Tierra del Fuego. It is associated with river margins, lakes, lagoons, wet meadows, mallines, damp grassland and clearings in humid or ecotonal woodland. It may feed some distance from open water in natural or modified grasslands. Records extend to approximately 1,800 metres above sea level in parts of its range. (sib.gob.ar)
Ashy-headed Geese are partial migrants rather than strictly sedentary birds. Many mainland birds move north during the austral winter, while some individuals remain in the breeding region year-round. The species is a rare visitor to the Falkland Islands, where it has also bred. (waterfowl.org.uk)
Behaviour and Diet
Ashy-headed Geese are mainly terrestrial and spend much of their time walking and grazing. They feed primarily on herbaceous vegetation, including grasses and other green plant material, and may use both natural pastures and agricultural fields. They swim less frequently than many typical geese, although adults may enter the water when accompanying young or during moult. (sib.gob.ar)
Pairs are generally stable and territorial during the breeding season. Outside that period, pairs and family groups may gather in small flocks, with larger groups sometimes forming in autumn and occasionally mixing with Upland Geese (Chloephaga picta). (sib.gob.ar)
Breeding usually takes place near water in grassland, wet ground or tussock vegetation. Nests are commonly concealed on the ground, although nesting in trees or elevated sites has also been reported. Clutches generally contain about five to seven eggs, and incubation is performed by the female for approximately 30 days. A study on Isla de los Estados recorded a mean clutch size of 4.7 eggs for the species. (waterfowl.org.uk)
Identification Tips
Look for the following combination of features:
- A small, compact sheldgoose with a grey head and neck.
- A black bill and yellowish legs.
- A chestnut breast contrasting with a white belly.
- Dark barring largely restricted to the flanks in adults.
- Similar plumage in males and females.
- A strongly terrestrial feeding style in grassland and wet meadow habitats.
The Ashy-headed Goose can be confused with the female Upland Goose, especially at a distance. The Ashy-headed Goose is smaller and has a grey head and neck, chestnut breast and relatively plain white belly, whereas the female Upland Goose is generally browner and more extensively barred. It also differs from the Kelp Goose, which is associated more closely with rocky coastal habitats and shows much stronger sexual differences in plumage. (sib.gob.ar)
Conservation Status
The Ashy-headed Goose is currently assessed as Least Concern on the IUCN Red List, with the latest BirdLife species factsheet recording a 2024 assessment. This global category does not mean that all populations are secure. Population size and trends are not well documented, and the species has received additional conservation concern in parts of Argentina. (datazone.birdlife.org)
Potential and documented pressures include habitat alteration, disturbance at breeding sites, historical persecution because of perceived competition with livestock, and predation by introduced mammals in parts of southern Patagonia. Research from Isla de los Estados highlights the importance of predator-free breeding habitat, while studies in southern Patagonia have identified domestic dogs and introduced American Mink as threats to ground-nesting sheldgeese. (waterfowl.org.uk)
Important conservation measures include protecting wetlands, grasslands and woodland edges, maintaining secure breeding areas, monitoring population trends and reducing disturbance and introduced-predator impacts. Local assessments should be considered alongside the global IUCN category because conservation conditions vary across the species’ range. (elhornero.avesargentinas.org.ar)
Frequently Asked Questions
Where does the Ashy-headed Goose live?
It occurs in southern Chile and southern Argentina, including Patagonia and Tierra del Fuego. It uses wet meadows, river and lake margins, grasslands, mallines, open woodland and forest clearings.
Is the Ashy-headed Goose migratory?
It is a partial migrant. Many mainland birds move north during the austral winter, while some remain in the breeding region throughout the year.
What does the Ashy-headed Goose eat?
Its diet consists mainly of grasses and other herbaceous vegetation. It usually feeds by grazing while walking through grassland, wet meadows and pastures.
How can the Ashy-headed Goose be identified?
Adults have a grey head and neck, black bill, chestnut breast, white belly, dark flank barring and yellowish legs. Males and females are similar in appearance.
Where does the Ashy-headed Goose nest?
It usually nests on the ground in tussock grass, wet grassland or other concealed vegetation near water. Nesting in trees or elevated sites has also been recorded.
Is the Ashy-headed Goose endangered?
It is classified globally as Least Concern by the IUCN. However, local populations may face habitat loss, disturbance, persecution and predation by introduced mammals, so regional conservation assessments remain important.
References
- BirdLife International. 2024. Ashy-headed Goose Chloephaga poliocephala: species factsheet and IUCN Red List assessment. BirdLife DataZone. Accessed 8 September 2026. https://datazone.birdlife.org/species/factsheet/ashy-headed-goose-chloephaga-poliocephala
- Gill, F., Donsker, D. and Rasmussen, P., eds. 2026. IOC World Bird List, version 15.2. International Ornithologists’ Committee. Accessed 8 September 2026. https://worldbirdnames.org/
- Petracci, P., Sáenz Samaniego, R. A. and Raya Rey, A. 2016. Aspectos reproductivos y uso de hábitat del Cauquén Común (Chloephaga picta) y el Cauquén Real (Chloephaga poliocephala) en Isla de los Estados, Argentina. El Hornero 31(2): 73-81. https://doi.org/10.56178/eh.v31i2.553
- Sistema de Información de Biodiversidad, Administración de Parques Nacionales, Argentina. n.d. Chloephaga poliocephala (Cauquén Real, Ashy-headed Goose). Accessed 8 September 2026. https://sib.gob.ar/especies/chloephaga-poliocephala
- British Waterfowl Association. n.d. Ashy-headed Goose, Chloephaga poliocephala. Accessed 8 September 2026. https://www.waterfowl.org.uk/wildfowl/true-ducks/ashy-headed-goose/
- Canevari, M. 1996. The Austral Geese (Chloephaga spp.) of southern Argentina and Chile: a review of their current status. Gibier Faune Sauvage 13: 335-366. Citation details reproduced in Petracci, Sáenz Samaniego and Raya Rey 2016.
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