Kingdoms / Animalia / Craniata / Aves / Anseriformes / Anatidae / Anas / Species
< >  Anas sibilatrix - Chiloe wigeon (Click photographs/illustrations: full picture & further details)
Click on photograph for full-screen view Click on photograph for full-screen view Click on photograph for full-screen view Click on photograph for full-screen view Click on photograph for full-screen view

INFORMATION AVAILABLE

GENERAL & REFERENCES

EXTERNAL APPEARANCES

REPRODUCTION

BEHAVIOUR

NATURAL DIET

RANGE & HABITAT

CONSERVATION

Click image to return to Waterfowl Contents FlowchartCONTENTS
(Waterfowl)

Click image for list of Waterfowl Species

Click image for list of Waterfowl Agents
Click image for list of Waterfowl Diseases
Click image for list of Waterfowl Environmental Events / Factors

Return to top of page

General and References

Alternative Names (Synonyms)

Chilean wigeon
Chiloe widgeon
Southern wigeon
Chilepfeifente (German)
Canard de Chiloe (French)
Siffleur du Chili (French)
Silbón overo (Spanish)
Pato overo (Spanish)
Mareca sibilatrix

Names for newly-hatched

Duckling, downy.

Names for non-breeding males or other colour-phases

Eclipse.

Return to top of page

References

Species Author

Debra Bourne

Major References

B1, B3, B5, B8, B19, B25, B26.

Aviculture references:
B7, B29, B30, B31, B40, B94, B95, B96, B97, B108, B128.w1, B128.w2)
D1, D8

Other References

--
Click image for main Reference Section

Return to top of page

TAXA Group (where information has been collated for an entire group on a modular basis)

Parent Group

Specific Needs Group referenced in Management Techniques

Return to top of page

Aviculture information

Notes

General Information:
  • Dabbling Ducks are generally hardy, easy to maintain and easy to breed. Shelter may be required by some of the smaller species in winter. They should be provided with cover (including marginal pond cover) and loafing areas as well as water. A pen which is 50% water is suggested. The water may be shallow (i.e. no more than two feet deep is required), and muddy areas for dabbling in are also appreciated. These ducks are generally good in mixed collections, although the smaller and quieter species may be bullied. Territorial disputes between ducks of the same species may be avoided by keeping only one pair of each species in an enclosure, unless the area is very large. For a single pair of ducks a pen are of 50 to 100 square metres, depending on the size of duck, should be provided.
  • A diet based on wheat and pellets is suggested, with maintenance pellets changed to breeders pellets for the breeding season. Bread and greenfood are also appreciated. Grit should always be available, with soluble grit (e.g. oystershell grit) as a calcium source when breeding.
  • Most species are ground nesters and both close ground cover and ground level nest boxes should be provided. Hand-rearing is generally preferred, as these ducks are generally poor parents in captive conditions, particularly in enclosures shared with other waterfowl. These ducks are prone to hybridization, particularly with closely related species, which should be kept apart from one another.
  • Wigeon are grazing species and should be provided with a sward of short grass, with extra green food provided if sufficient grass is not available.

(B7, B29, B30, B40, B94, B128.w1, D1)

Species-specific information:

  • Chiloe wigeon are winter-hardy. They require short grass for grazing. May be aggressive while breeding and drakes may rape other ducks, but if they are well-paired they may be maintained in a mixed collection; alternatively a separate enclosure may be used. Feed as other dabbling ducks: grain, pellets, greenfood, grass, bread.
  • These ducks are easy to breed. They require good ground cover for nesting , also use a ground-level box or a raised box, basket, even a tunnel nest box. Nest boxes on islands or near water are preferred. They usually lay end of April to June and may produce three clutches of eggs if the clutch is removed. They are easy to incubator hatch and to rear, with no problems in starting to feed but require plenty of green food as well as rearing meal; aquatic insects are also appreciated. The drake is protective and will assist in rearing ducklings.
  • Frequently hybridise with other Anas spp.; hybrids also reported with Netta rufina - Red-crested pochard, Aix sponsa - Wood duck, Nettapus auritus - African pygmy-goose. (B97).

(B29, B31, B40, B94, B95, B96, B97, B108, B128.w2)

Aviornis UK Ringing Scheme recommended average ring size: L 11.0mm (D8).

Management Techniques

--
Click image for main Aviculture Section

Return to top of page

External Appearance (Morphology)

Measurement & Weight

Length 17-21 inches, 43-54cm (B3, B1).
Adult weight General 828-939g (B1).
Male About 939g (B3); 2.1 lbs. (B8).
Female About 828g (B3); 1.8; lbs. (B8).
Newly-hatched weight --
Growth rate --

Return to top of page

Head

Adult Bill Male Blue-grey, with a black nail.
Variations (If present) --
Eyes (Iris) Male Brown.
Variations(If present) --
Juvenile Bill Blue-grey, with a black nail.
Eyes (Iris) Brown.

Return to top of page

Legs

Adult Male Dark grey.
Variations (If present) --
Juvenile Dark grey.

Return to top of page

Plumage

Adult Male Head and neck black, glossy green on sides from eyes to nape and with a white forehead extending into a large crescent in front of eye, smaller white spot below and behind eye. Breast black and white barred, upperparts black with white feather edging (including on elongated scapulars and tertials), flanks rufous, tail black, rump and tail-coverts white.

Wing has primaries dark grey-brown, secondaries black with green gloss, coverts white with black tips to greater coverts.

Variations (If present) Female has brown mottling on upperwing coverts.
Juvenile Duller, with little glossy green on the head

Return to top of page

Newly-hatched Characteristics

General: Upperparts dark brown, underparts and markings on wings and back buff. Red sides of head with dark eyeline.
Bill: Dark grey.
Feet: Dark grey.

Return to top of page

Reproduction

Reproductive Season

Time of year Spring and summer. Begins August/September on the mainland, slightly later (starting September) in the Falklands.
No. of Clutches Sometimes second clutch.

Return to top of page

Nest placement and structure

In vegetation on the ground, sometimes at some distance from the water.

Return to top of page

Egg clutches

No. of Eggs Average --
Range 5-8 (B1, B8).
Egg Description White or pale buff. Size: 58 x 40mm, weight: 53g.

Return to top of page

Incubation

About 26 days (B1); 24-26 days (B8).

Return to top of page

Hatching

Synchronous.

Return to top of page

Fledging

45-55 days (B8).

Return to top of page

Sexual Maturity

Males --
Females --

Return to top of page

Behaviour

Feeding Behaviour

Adults Grazes on land, also dabbles, head-dips and up-ends in the water.
Newly-hatched --

Return to top of page

Parental Behaviour

Nest-building Nest as solitary pairs or in loose groups.
Incubation By female only.
Newly-hatched Tended by both parents. Males may raise ducklings alone if mate is lost.
Juveniles

--

Return to top of page

Social Behaviour

Intra-specific Generally gregarious but territorial while breeding.
Inter-specific --

Return to top of page

Sexual Behaviour

Pair bonds probably permanent.

Return to top of page

Predation in Wild

--

Return to top of page

Activity Patterns

--
Circadian --

Return to top of page

Natural Diet

Adults

Basically vegetarian. Grasses, sedges, green parts of various aquatic and other plants.

Return to top of page

Newly-hatched

--

Return to top of page

Range and Habitat

Distribution and Movement (Migration etc.)

Normal South America south of central Argentina, Falkland Islands.

Southern populations migrate to winter at lower latitudes – north to Uruguay, Paraguay, and southern Brazil.

Falklands population sedentary.

Occasional and Accidental Vagrants to South Georgia, South Shetland and South Orkney Islands, even Antarctic Peninsula.
Introduced

--

Return to top of page

Habitat

Lakes, lagoons, slow rivers with grazing available and scattered trees.

Return to top of page

Conservation

Intraspecific variation

--

Return to top of page

Conservation Status

Wild Population -
(Importance)

Widespread and fairly abundant.

CITES listing --
Red-data book listing --
Threats --

Return to top of page

Captive Populations

Common in collections.

Return to top of page

Trade

--

Return to top of page