Extremely large duck, significantly larger than the mallards it was mingling with.
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Hi, I'd say it is a hybrid between a mallard (or possibly domestic duck) and a domestic muscovy duck.
Thanks for the suggestion. Not sure I agree with the muscovy bit though, because muscovy ducks, though white, black, or anything in between, would be speckled black and white, rather than the perfect black and white with white collar and primaries shown in pic2. But I agree the speculum is mallard-like. I thought the size though was very striking. This was also apparently the only bird of its kind at the location. All the other birds there had multiple specimens of their own kind.
I think you've discovered a new species (wink). Was it hanging out with any other ducks? Or did it appear to be shunned and excluded from duck society?
Some pictures of the Swedish blue and Swedish black look remarkably similar in a lot of ways if not exactly. That seems the best guess so far.
You may well be right here. I've had a look at some of the 'swedish' types on here. Can't say there is an exact match, but then hybrids do lead to an enormous amount of variety.
Mallards with muscovy ducks do have an enormous amount of variety too.
The "manky mallards" link is interesting. It does mention size (selective breeding for high meat yield), and speculum colour as the identifier, and the fact that feral mallards hang out with wild ones. And thanks to blewit boy and yourself for good likely answers.
Lat/Lng: 53.5, -2.8
OS grid ref: SD5103