Alternative Names (Synonyms)

Koloa
Anas platyrhynchos wyvilliana

Names for newly-hatched

Names for non-breeding males or other colour-phases

References

Species Author

Major References

Aviculture references:
B7, B29, B30, B40, B94, B128.w1
D1, D8

Other References

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

Parent Group

• Waterfowl
• Dabbling Ducks

Specific Needs Group referenced in Management Techniques

Aviculture Information

Notes

• 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.

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

Species-specific information:

• Hawaiian ducks are not difficult to keep; cover and loafing areas should be provided as well as water.
• These ducks are easy to breed. They usually lay from April to June, in close ground cover or ground-level nest boxes.
• This duck readily hybridises with Anas laysanensis - Laysan duck. Should be kept separate from this species and other closely-related (mallard-type) species to avoid hybridisation.

(B29, B30, B94)

Aviornis UK Ringing Scheme recommended average closed ring size: J 9.0mm (D8).

Management Techniques

Measurement & Weight

Head

Legs

Plumage

Wing has coverts and primaries brown, greater coverts white-tipped, secondaries iridescent green to blue with black subterminal band and white tips: speculum with narrow black and white boundaries.

Eclipse, and duller males in breeding season: Similar to female.

Newly-hatched Characteristics

Nest placement and structure

Egg clutches

Incubation

Hatching

Fledging

Sexual Maturity

Feeding Behaviour

Parental Behaviour

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Social Behaviour

Sexual Behaviour

Predation in Wild

Activity Patterns

Adults

Newly-hatched

Distribution and Movement (Migration etc.)

Hawaiian islands: Kauai.

Sedentary.

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Re-introduced to Hawaii and Oahu.

Habitat

Intraspecific variation

Conservation Status

Rare, low numbers (B1, B44.9.w1).

Captive Populations

Trade