|Mallard (Anas platyrhynchos)|
Dunsapie Loch, Edinburgh, Scotland
The first four photos are of males in various stages of eclipse plumage. The last two are of males in breeding plumage
|Although the general appearance approaches that of a female, the bill is yellow rather than orange with black and the breast is reddy-brown rather than buff.
There are some more photos available at the Berkeley Digital Library