Hawaiian Duck
Anas wyvilliana
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About
A medium-sized duck resembling a female Mallard, with mottled brown plumage and green speculum. Endemic to Hawaii; hybridizes with feral Mallards, threatening its genetic integrity. Found on freshwater wetlands of Kauai and other islands. Endangered; conservation focus on reducing hybridization.
Physical Description
| Measurement | Value | Imperial |
|---|---|---|
| Wingspan | 44.0 cm | 17.3 in |
| Weight | 573.25 g | 20.22 oz |
Identification
Plumage
Mottled brown plumage; males may show slight green gloss on head but reduced compared to Mallard. Iridescent blue-purple speculum with white borders. Orange bill. Females similar to males; pale buff supercilium.
Habitat & Range
Freshwater marshes, rivers, reservoirs, and taro fields on Kauai and other Hawaiian islands. Nests in dense vegetation near water. Threatened by hybridization with domestic or feral Mallards.
Geographic Range
Ranges across sub-Saharan Africa in open grasslands and wetland edges. Locally nomadic following seasonal rainfall patterns.
Diet & Feeding
Fish-diving duck of South American rivers; uses serrated bill to catch fish and aquatic invertebrates; diet mainly fish year-round.
Conservation Status
Behavior & Breeding
Nesting
Nest type: HC.
Clutch Size
9-13
Sound
Song
Female produces a raspy, descending quacking series; male gives a soft, nasal sound. Calls similar to Mallard but higher-pitched; alarm is a rapid-fire quacking rattle.
Taxonomy
| Kingdom | Animalia |
| Phylum | Chordata |
| Class | Aves |
| Order | Anseriformes (Waterfowl) |
| Family | Anatidae (Ducks, Geese & Swans) |
| Genus | Anas |
| Species | Anas wyvilliana |
Distribution
Hawaiian Duck has been recorded in 5 countries.
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External Databases
Frequently Asked Questions
What does the Hawaiian Duck eat?
Where does the Hawaiian Duck live?
Is the Hawaiian Duck endangered?
How does the Hawaiian Duck nest?
What does the Hawaiian Duck sound like?
How big is the Hawaiian Duck?
What order and family does the Hawaiian Duck belong to?
Similar Birds
Other species in the Anatidae family