| Blue duck | |
|---|---|
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| Blue duck at Staglands, Akatarawa Valley | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Anseriformes |
| Family: | Anatidae |
| Genus: | Hymenolaimus G.R. Gray, 1843 |
| Species: | H. malacorhynchos
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| Binomial name | |
| Hymenolaimus malacorhynchos (Gmelin, JF, 1789)
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| Subspecies | |
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See text | |
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| Synonyms | |
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Anas malacorhynchus (protonym) | |
The blue duck or whio (Hymenolaimus malacorhynchos) is a member of the duck, goose and swan family Anatidae endemic to New Zealand. It is the only member of the genus Hymenolaimus. Its exact taxonomic status is still unresolved, but it appears to be most closely related to the tribe Anatini, the dabbling ducks.
The whio is depicted on the reverse side of the New Zealand $10 banknote.
- ^ BirdLife International. (2022). "Hymenolaimus malacorhynchos". IUCN Red List of Threatened Species. 2022: e.T22680121A214275489. Retrieved 5 June 2023.