Has been called: the Great Black and White Duck, OK not the most poetic for sure, but it covers all the bases! also Dusky Duck, which suits the female and young juvenile, and from Shetland we have Dunter and Dunter Duck This latter maybe from the Swedish
dun = down and
taer a = to gnaw, from its habit of plucking down from its breast when hatching eggs. Lastly, from Northumberland, we have St. Cutherbert's duck or Cudberduce, this from their nesting on the Farne islands, where they provided companions for the saint's solitude. I don't think you could wish for better mates, sitting on a rock on your own or not.
For such a large imposing duck, they have the most soft and enchanting call, If you've not heard it before then:
🔊 Click to play. Note this automatically opens a popup window that plays the call and then closes. The recording lasts approx one minute. Check volume before playing!
» » » Health Warning « « « This call is addictive. I cannot be held responsible if you spend all day listening to it over, and over, and . . . .
Recording is by Thomas Bergman, to whom I gratefully give all thanks and acknowledgements. The recording can be found at https://xeno-canto.org/539071.