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they have lungs
The Black Swedish duck would match that description, as would the Cayuga.
on its beak
Beak.
Bill.
Bill.
beak
It has a duck like beak.
A beak or bill
If I knew which kind of duck you are speaking of I could better answer you question. As a waterfowl lover, I don't know of any ducks who's beak turns white naturally. I would call your vet ASAP.
A BEAK :P A BEAK :P
beak