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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 ...
The species' common name comes from the sky-blue wing coverts. Crested duck and bronze-winged duck: Iridescent purple-bronze, edged white. [3] Pacific black duck: Iridescent green, edged light buff. [3] Mallard: Iridescent purple-blue with white edges. [1] American black duck: Iridescent violet bordered in black and may have a thin white ...
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.
The adult male has a blue-black head and neck, with a black rump and tail; the back and flank are lightly flecked with a pale yellow colour. The wings of males have contrasting white upper-coverts and black remiges, metallic green speculum feathers, and rusty brown tertials feathers. The male also has a dark grey flecked with pale-yellow breast ...
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 ...
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]
The West Indian whistling duck is the largest and darkest of the whistling ducks with a length of 48 to 58 cm (19 to 23 in). The female weighs from 800 to 1,320 g (1.76 to 2.91 lb) and the male weighs from 760 to 1,240 g (1.68 to 2.73 lb); this species is about the size of a mallard. [9] It has a long black bill, long head and longish legs.