This Duck , is found in India too although this one was photographed in London. It is a Winter visitor to India and the ones that come here never let me approach them this close.
This Common Pochard (Aythya ferina) is a male and are generally found in large flocks. The forage by diving and feed on aquatic plants , small fish and mollusc's.
The light was not very good when I was photographing the bird and I clicked lots of photographs on spot metering mode and metered every colour on the bird. Just one of the 10 photographs got metered properly.
Its best to photograph ducks when they have just come out of water from a dive, the body will be covered with tiny water droplets that give the photograph a nice look.
Sony A-350 / 200mm lense. ISO-200, f/5.6 , 1/320 , RAW image