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The Swedish Blue is a medium-sized bird: drakes weigh some 3–4 kg, ducks about 2.5–3.5 kg.It is rather shorter and broader in body shape than breeds such as the Cayuga or Orpington; [8]: 63 the body is rounded, plump and full-breasted, the back is straight and fairly flat, and is about half as long again as it is broad.
This is a list of the breeds of domestic duck which have official recognition at national or international level. [1]Most breeds of duck derive from the wild mallard, Anas platyrhyncos, while a small minority are descendants of the Muscovy duck, Cairina moschata.
The Duclair duck is a type of Rouen duck and is also described as resembling the Swedish Blue. Males weigh up to 6.6 pounds (3.0 kg) and females up to 5.5 pounds (2.5 kg). There are two color varieties, black and a less common blue. Both have a single white feather on each wing and a white bib.
The Shetland is a small, hardy breed; it is active and forages well. [8] It is essentially a smaller version of the Swedish Blue, but with black plumage where the Swedish has blue; [9]: 457 [10]: 489 the black has glossy green and blue lights in it. [8]
The American black duck (Anas rubripes) is a large dabbling duck in the family Anatidae.It was described by William Brewster in 1902. It is the heaviest species in the genus Anas, weighing 720–1,640 g (1.59–3.62 lb) on average and measuring 54–59 cm (21–23 in) in length with an 88–95 cm (35–37 in) wingspan.
Gulls are typically gray or white, often with black markings on the head or wings. They have stout, longish, bills and webbed feet. Terns are a group of generally medium to large seabirds typically with gray or white plumage, often with black markings on the head. Most terns hunt fish by diving but some pick insects off the surface of fresh water.
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Linnaeus was not particularly familiar with the winter plumages of either the auk or the duck, and appears to have confused the two species. [3] Other old names include rotch, rotche, [4] bullbird, [5] and sea dove, although the latter sometimes refers to a relative, the black guillemot. [6] They breed on islands in the high Arctic.