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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.
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 ...
Like every other duck on this list, the males are the real showstoppers since they are the ones with the bright red beak that lends to their dramatic profile. Female red-crested pochards, on the ...
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 ] The plumage is a dark slate-grey with a greenish sheen on the head, a chestnut-flecked breast.
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 red spots at the base of the bills are absent in haringtoni. It measures 55–63 cm (22–25 in) in length and 83–95 cm (33–37 in) across the wings, with a body mass of 790–1,500 g (1.74–3.31 lb). [13] [14] These are mainly grey ducks with a paler head and neck and a black bill tipped bright yellow. The wings are whitish with black ...
Adult males are 60 to 70 cm (24 to 28 in) long and have a distinctive large, leathery lobe underneath the bill; females are 47 to 55 cm (19 to 22 in) long and unadorned. Their drab dark grey-brown, slightly pin-striped plumage is inconspicuous and does not differ between the sexes. This species weighs an average of 2,398 g (5.287 lb) in males ...
A black-bordered white collar separates the head from the breast. The body is largely a lighter slate blue with chestnut sides. A black-bordered white bar divides the breast vertically from the sides. The tail is black, long and pointed. The speculum is metallic blue. The inner secondary feathers are white and form white markings over the back ...