DUCK - 5 - a photo on Flickriver

DUCK - 5

            The Mallard, or Wild duck (Anas platyrhynchos[1]), probably the best-known and most recognizable of all ducks, is a dabbling duck which breeds throughout the temperate and sub-tropical Americas, Europe, Asia, New Zealand (where it is currently the most common duck species), and Australia.

The male birds have a bright green head, while the female's is light brown. The Mallard lives in wetlands, eats water plants, and is gregarious. It is also migratory. The Mallard is the ancestor of all domestic ducks, and can interbreed with other species of genus Anas.[2] This interbreeding is causing rarer species of ducks to become genetically diluted.

The Mallard is 56–65 centimetres (22–26 in) long, has a wingspan of 81–98 centimetres (32–39 in), and weighs 0.9–1.2 kilograms (32–42 oz). The breeding male is unmistakable, with a bright green head, black rear end and a yellowish orange (can also contain some red) bill tipped with black (as opposed to the dark brown bill in females), and is also nature's most feared duck. The female Mallard is light brown, like most female dabbling ducks. However, both the female and male Mallards have distinct purple speculum edged with white, prominent in flight or at rest (though temporarily shed during the annual summer moult). In non-breeding (eclipse) plumage the drake becomes drab, looking more like the female, but still distinguishable by its yellow bill and reddish breast.

In captivity, domestic ducks come in wild-type plumages, white, and other colours. Most of these colour variants are also known in domestic Mallards not bred as livestock, but kept as pets, aviary birds, etc., where they are rare but increasing in availability.

A noisy species, the male has a nasal call, the female has a "quack" stereotypically associated with ducks.[3]

The Mallard is a rare example of both Allen's Rule and Bergmann's Rule in birds. Bergmann's Rule, which states that polar forms tend to be larger than related ones from warmer climates, has numerous examples in birds. Allen's Rule says that appendages like ears tend to be smaller in polar forms to minimize heat loss, and larger in tropical and desert equivalents to facilitate heat diffusion, and that the polar taxa are stockier overall. Examples of this rule in birds are rare, as they lack external ears. However, the bill of ducks is very well supplied with blood vessels and is vulnerable to cold.

Taken in: Sverige / Skåne Län / Malmö / Slottsstaden (show map)

Taken on: May 15, 2011

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Camera: Nikon D60, f/5.6, 1/500 sec, 300mm (=450mm), ISO 280 (more info) (hide info)

Camera:	Nikon D60
Aperture:	f/5.6
Exposure Time:	0.002 sec (1/500)
Focal Length:	300mm (35mm equivalent: 450mm)
ISO:	280
Exposure Bias:	0 EV
Flash:	No Flash
Exposure Program:	Not Defined
Exposure Mode:	Auto
Metering Mode:	Multi-segment
White Balance:	Auto
Color Space:	sRGB
Software:	Embettered by PicMonkey. http://www.picmonkey.com
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