Hawaiian Duck

Anas wyvilliana

Order

ANSERIFORMES

Family

Ducks, Geese and Swans (Anatidae)

Code 4

HAWD

Code 6

ANAWYV

ITIS

Egg Color:

Tan



Number of Eggs:

2 - 10



Incubation Days:

26 - 30



Egg Incubator:

Female



Nest Location:

On ground.



Nest Material:

Grasses and wetland vegetation.



Migration:

Nonmigratory



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General

Hawaiian Duck: Medium to large duck that is mostly mottled brown, buff and black, more uniform gray brown on throat, nape and head. Blue-green speculum bordered by white. The head of the male is darker gray-brown than that of the female. Gray, spatula shaped bill, female's may have an orange tip; orange legs. Most females have a buff supercilium, are smaller than males, slightly lighter in color, with a paler, buff-colored chin, duller back feathers with pale olive and flesh-colored tip and dark eye-line.

Breeding and Nesting

Hawaiian Duck: Two to ten tan colored eggs are laid in a concealed nest placed on the ground near wetlands. It is made of grasses and other marsh vegetation and lined with down and feathers. The female incubates the eggs for 28 days. When the precocial chicks hatch, they trail their mother to the safety of the water.

Foraging and Feeding

Hawaiian Duck: These ducks feed on aquatic invertebrates, aquatic plants, seeds, grains, and sometimes tadpoles. They forage in shallow water, or deep along the edges of streams, wetlands, the littoral zone of reservoirs and ponds, and ephemeral water sites. They forage by filtering seeds and invertebrates from the water column through lamellae of the bill, or tipping and foraging in subsurface mud layers.

Vocalization

Hawaiian Duck: Females make a series of evenly spaced, soft quacks. The female will quack loudly if her nest is disturbed while circling an intruder. Chortling and guttural sounds between courting or foraging birds has also been documenter. Male's call is a single, soft quack.

Similar Species

Hawaiian Duck: The male Mallard has a dark green head and is more uniform gray on the back and wings. The female Mallard has white outer tail feathers, a purple-blue speculum, and more orange on the bill.

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ChinX
The area of the face just below the bill.
NapeX
Also called the hindneck or collar, it is the back of the neck where the head joins the body.
SpeculumX
The brightly colored area on the wing (secondaries of the wing) on several duck species.
SuperciliumX
Also called the superciliary, it is the arch of feathers over the eye.
Parts of a Standing bird X
Head Feathers and Markings X
Parts of a Flying bird X