The Red-Crested Pochard:
Surely this one takes the biscuit for the most ridiculous duck in the UK?
The UK breeding population is only 10 to 20 pairs according to the RSPB. That probably doesn’t include escapees from duck collections (yes, there really are duck collectors).
If you know of a more ridiculous duck in the UK, do let me know. We can have a duck-off.