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The blue-billed duck (Oxyura australis) is a small Australian stiff-tailed duck, with both the male and female growing to a length of 40 cm (16 in). [ 2 ] [ 3 ] The male has a slate-blue bill which changes to bright-blue during the breeding season, hence the duck's common name.
This has created conservation concerns for relatives of the mallard, such as the Hawaiian duck, [124] [125] the New Zealand grey duck (A. s. superciliosa) subspecies of the Pacific black duck, [124] [126] the American black duck, [127] [128] the mottled duck, [129] Meller's duck, [130] the yellow-billed duck, [123] and the Mexican duck, [124 ...
1888 illustration of the beak and head of the blue duck Blue duck, Mikonui River. The blue duck is 53 cm (21 in) long and varies in weight by sex. Females are smaller than males, weighing 680–870 g (24–31 oz), whereas the males weigh 820–970 grams (29–34 oz). [16]
That is to say, the first drake (male) duck. With his iridescent green head and yellow bill, narrow white ring about the neck, reddish-brown chest and perky black tail curl, he’s hard to miss.
It has a light blue bill with a small black nail on the tip, yellow eyes, and is 20% heavier and 10% longer than the closely related lesser scaup. [16] The male has a dark head with a green to purple sheen, a black breast, a light back, a black tail, and a white underside. The drake or male is larger and has a more rounded head than the female.
American Pekin flock. The Pekin or White Pekin is an American breed of domestic duck, raised primarily for meat. [6] [7] It derives from birds brought to the United States from China in the nineteenth century, [8] and is now bred in many parts of the world. [6]
This is a large duck, and the male's long central tail feathers give rise to the species' English and scientific names. Both sexes have blue-grey bills and grey legs and feet. The drake is more striking, having a thin white stripe running from the back of its chocolate-coloured head down its neck to its mostly white undercarriage.
The adult mottled duck is 44 to 61 cm (17–24 in) long from head to tail. It has a dark body, lighter head and neck, orange legs and dark eyes. Both sexes have a shiny green-blue speculum (wing patch), which is not bordered with white as with the mallard. Males and females are similar, but the male's bill is bright yellow, whereas the female's ...