Struggling with this one, not sure what kind of duck it is. Black and white markings with some brown, medium to large sized duck, broadish beak.
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It is what I call an ASP duck, all spare parts. It looks like a farmyard duck that has interbred with a mallard. Ther are far too many of these interbred ducks and it is about time some action was taken as they will breed with pure wild ducks.
I call them mucky ducks. May well be a cross between a muscovy duck and a mallard or a domesticated duck and a mallard.
I don't share the sentiment that action should be taken, you'd never be able to control this. They do add a bit of interest.
To me, 'dodgy ducks'. As far as I am aware, they remain a small part of wild populations and revert to wild type over few generations - I'm no geneticist but I imagine the white type (in this case) is recessive and soon ceases to be expressed when it's 1/4 then 1/8 etc (not that simple I'm sure...). Of course I may be talking complete scribble...
This summer I saw a Mallard drake that was about 20% larger than its fellow mallards. I thought this odd, but then when they left the water to wander on the bank, the large one walked upright like an indian runner.
Presumably domesticated ducks are artificially selected mallard races, so interbreeding is fair game. Can it be argued that this is promoting biodiversity and that we are getting to precious about the "true" types that we think "ought" to be there?
Similar themes have come out in some iSpot forums
Almost all ducks like this are 'mongrels' from the crossing of various breeds of domesticated Mallard with each other and/or 'wild type' Mallards. These breeds are all Mallards in the same way that all the breeds of domestic dog are the same species.
Hybridisation with other species has been widely recorded with Mallards though.
Type 'Manky Mallards' or 'Hybrid Mallards' into a search engine and you'll find some good web pages about both.
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