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Anas platyrhynchos
The breeding male Mallard is unmistakable, with a glossy bottle-green head and white collar which demarcates the head from the purple-tinged brown breast, grey brown wings, and a pale grey belly. The rear of the male is black, with the dark tail having white borders. The bill of the male is a yellowish orange tipped with black while that of the female is generally darker ranging from black to mottled orange. The female Mallard is predominantly mottled with each individual feather showing sharp contrast from buff to very dark brown, a coloration shared by most female dabbling ducks, and has buff cheeks, eyebrow, throat and neck with a darker crown and eye-stripe. Both male and female Mallards have distinct iridescent purple blue speculum feathers edged with white, prominent in flight or at rest, though temporarily shed during the annual summer moult. (Wikipedia)
The Mallard is a dabbling duck which breeds throughout the temperate and subtropical Americas, Europe, Asia, and North Africa, and has been introduced to New Zealand and Australia. Mallards live in wetlands, eat water plants and small animals. (Wikipedia)
Check the feedback page of projektNOAH at "http://getsatisfaction.com/noah". You may have good ideas...
Thanks"ID" for the ID. I did not know that the change der plumage a the dark times. Even in winter we can find the normal plumage here.
Daniele, thanks for the comment, maybe there are some other bird specialist outside who may help me to find the ID.
Nice picture Saarbrigger, The background looks like an impressionist painting. The ducks are a mystery to me...