Crested duckling with black bill

[HeatherMarieR]

I have a Crested duckling that looks solid yellow, but its bill is black. The other one that I bought with it has a yellow/orange bill. Will the one with the black bill end up having black on its body?

 

[buff goose guy]

picture please ?

 

[HeatherMarieR]

 

[Amiga]

My first two thoughts are Buff or Welsh Harlequin.

 

[HeatherMarieR]

Thanks! The pictures I've seen of Buffs are really pretty!