a very large duck
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Did it walk upright like that all the time?
It was on a little island in the middle of a pond on a rural common, there were 2 geese, 1 heron, several ordinary ducks and a muscovy duck, and this one strode out from behind the reeds and I thought perhaps it was going to chase off the duck nearby, but it didnt. Then it went behind the reeds again and didn't walk any more while I was watching. It loooked very imposing!
With the full name there will be some reading on the web. It must walk upright in order to see over vegetation for hidden predators behind it.
The upright posture of Indian Runner Ducks has nothing to do with adaptation to avoid predators, it is nothing more than a physical change that was noticed by breeders and built upon over generations of selective breeding.
It must be an escape from a collection of some sort.
Lat/Lng: 51.2244, -0.3128
OS grid ref: TQ179485