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I agree the line may be a bruise- the discoloration Im not sure. It may possibly be his bill shedding the outa layer. They do that sometimes. Does it look like it's peeling? Does it feel the same as the rest of the beak?First the dark line appeared at the top, then the discoloration. Is those anything to to concerned about? See photo
Thanks
I do remember seeing one of mine do that too once.A few of my ducks shed the beak for some reason
Not all do but it usually happens in winter