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The lake duck (Oxyura vittata) is a small, South American stiff-tailed duck. It is also called the Argentine blue-bill , Argentine blue-billed duck , [ 2 ] Argentine lake duck , or Argentine ruddy duck .
Among vertebrates, the Argentine blue-bill duck has the longest penis in relation to its body size. [18] The vampire squid has the largest eyes of any animal relative to its size. [19] The kiwi lays the largest egg of any bird relative to its size – up to a quarter of the mass of the female.
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.
It resembled a small ruddy duck or, even more, an Argentine blue-bill. A larger Middle Pleistocene fossil form from the southwestern United States was described as Oxyura bessomi; it was probably quite close to the ruddy duck. "Oxyura" doksana from the Early Miocene of Dolnice (Czech Republic) cannot be assigned to any anatine subfamily with ...
The rufous hornero is the national bird of Argentina.. This is a list of the bird species recorded in Argentina.The avifauna of Argentina has 1043 confirmed species, of which 18 are endemic, nine have been introduced by humans, 68 are rare or vagrants, two are thought to be extinct, and four and possibly a fifth have been extirpated.
The adult greater scaup is 39–56 cm (15–22 in) long with a 71–84 cm (28–33 in) wingspan and a weight of 726–1,360 g (1.601–2.998 lb). 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]
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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: