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Males have a red head, black chest, brown/silver back, white underside, black tail and red bill.
Montane urban lake (Lake Lucerne)
I found some interesting info on these ducks:
The pochard is a stocky diving duck, smaller than a mallard. The male is pale grey with a rusty red head and neck, and a black breast and tail. The female is brown with a dark head and blotchy cheeks. In flight, birds show a pale grey wing-stripe. Birds breed in eastern England and lowland Scotland, and in small numbers in Northern Ireland, with numbers increasing, perhaps helped by the creation of more gravel pits and reservoirs. Breeding birds are susceptible to disturbance and pollution though. British breeding birds disperse in winter, some to Europe, and many birds move here in winter from northern and eastern Europe. They like to eat Plants and seeds, snails, small fish and insects. There are around 500 breeding pairs in the uk. (http://www.youtube.com/watch?v=BCIqfXtun...)