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Not sure about the duck species but lovely water effects in a couple of your shots!
I'm having difficulty with this being a mallard it doesn't look much like the 'regular' mallard I know! Can someone explain please :o)
They are usually crosses between domesticated varieties and wild birds - or in-betweens. Most domesticated ducks were bred from wild mallards - Muscovy is,I think, one exception.
Try googling "manky- " or "heinz mallards" for some good illustrated sites.
cheers - that's cleared up that little mystery :o)
Lat/Lng: 51.4497, -0.1102
OS grid ref: TQ314739