Black feather on my white Campbell

[Finlay]

Hi has anyone ever experienced this before, I started to notice a funny colour mark on my white Campbell’s back. Iv just had a little look and in between her wings on her back she has a bluey/black feather, it’s only become noticeable the past 2 days. Has anyone had this or know why she has it?

 

[Isaac 0]

Do you have a picture?

 

[Finlay]

Do you have a picture?

No I didn’t manage to get one i will try later! Can’t see it until I move her wings or she’s flapping them it’s just looks really random and I wasn’t sure if it was normal or not just curious to know