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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 greater scaup (Aythya marila), just scaup in Europe or, colloquially, "bluebill" in North America, [3] is a mid-sized diving duck, larger than the closely related lesser scaup and tufted duck. It spends the summer months breeding in Iceland , east across Scandinavia , northern Russia and Siberia , Alaska , and northern Canada .
The lake duck grows to 36–46 centimetres (14–18 in). Females weigh 510–700 grams (18–25 oz) and males 600–850 grams (21–30 oz). Males can be distinguished from Andean duck (Oxyura ferruginea), a similar species, by being smaller and having a flatter head. [2] Female ducks have an anti-corkscrew vagina made for difficult penetration.
Blue Duck and Belle Starr, May 24, 1886. Blue Duck, sometimes referred to as Bluford Duck (c. 1858–1895), was an outlaw of the American Old West, probably best known for a photograph taken of him in the mid-1880s, in which he posed with Belle Starr, a famous female outlaw.
Female and immature hybrids typically lack the white bill base, except in those between lesser scaup and ring-necked duck, where the white extends to the eye region. But especially with juveniles, the bi-colored bill of hybrids is most diagnostic. Hybrid combinations that are known from the wild and resemble the lesser scaup are:
The eastern spot-billed duck is darker and browner than the Indian spot-billed duck; its body plumage is more similar to the Pacific black duck. It lacks the red bill spot, and has a blue speculum. [14] [15] Both males and females undergo a complete postnuptial moult, dropping all their wing feathers simultaneously. [14]
The black-headed duck of Heteronetta is indisputably quite basal, looking more like a typical duck-like Anatidae with a short tail and normal bill. The masked duck of Nomonyx has a more intermediate position; it probably diverged from the lineage leading to the main radiation some time after Heteronetta .
The bluebills are the genus Spermophaga of the estrildid finches family. These birds are found in tropical Africa.They are gregarious seed eaters with short, thick, blue and red bills.