This morning I was out running as I came up behind two ducks. One was obviously a Mallard male, but the other one looked rather strange. Back home I studied Bird Guide - Birds of Europe and the Medterranean in the Field and RSPB Handbook of British Birds for clues on this strange duck. I was unsuccessful! Until I looked a little bit clooser in the RSPB and saw some similarities with a juvinile Mallard. I remembered that Mallards may frpm time to time look strange for different reasons, most probably caused by mixing genetic material with other types of ducks. The picture above is an attempt to show how this strange duck appeared to med this morning. Does anybody has any clue of what it is? Am I on the right track?