Birthmark on duckling?

[WhiteTreeOfGondor]

I'm curious if anyone else has seen something like this. I just hatched ducklings from my dusky Khaki Campbell/Welsh Harlequin drake and Khaki Campbell hens. All the ducklings are dusky. But this little one has a unique triangular yellow mark on its head. I'm wondering if it's going to be white when she grows up. Can ducklings have birthmarks?

 

[Miss Lydia]

Never heard of it happening. Is that the down that is yellow or the skin? Birthmarks are on the skin.
But if she is the only one like this you'll always be able to tell her apart from the others.
She is adorable

 

[WhiteTreeOfGondor]

Never heard of it happening. Is that the down that is yellow or the skin? Birthmarks are on the skin.
But if she is the only one like this you'll always be able to tell her apart from the others.
She is adorable

Thank you, she's a sweet little one . Her skin is dark so it's just the down that's yellow.