Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is 2,200 (2010) and decreasing.
Status EN
Habitat loss through grazing, hunting, predation by introduced mammals and hydridization with Northern Mallard (Anas platyrhynchos) are the main threats.
For more information see BirdLife International Species Factsheet.
Food
An opportunistic feeder, taking invertebrates, seeds and plant matter.
Voice
Quacking similar to that of Northern Mallard (Anas platyrhynchos), but softer and uttered less often.
Hawaiian Duck (Anas wyvilliana) [XC234981]
by Dan Lane from Kahuku, Honolulu County, Hawaii, United States (call, song)
Hawaiian Duck (Anas wyvilliana) [XC235000]
by Dan Lane from Hanalei NWR, Kauai County, Hawaii, United States (call)
Subspecies
Considered by some authors to be a subspecies of Northern Mallard (Anas platyrhynchos).
No subspecies.
Similar Species
Female Northern Mallard (Anas platyrhynchos) which is much larger, with white rather than buff outer tail feathers and blue-purple speculum. Hybrid Northern Mallard (Anas platyrhynchos) x Hawaiian Duck (Anas wyvilliana) can have any combination of parental characters, but usually larger than pure birds.
References
See References.
BirdLife International Species Factsheet