Khaki Campbell boy or girl?

[Everose]

It's a boy, those tail feathers are the tell tale sign.

 

[Everose]

https://www.backyardchickens.com/articles/what-gender-is-my-duck.76564/
Here's a good article. Kc is the example used.

 

[Chickenmama51]

Yes, he is definitely a male. Yesterday I also noticed a few itty bitty green feathers on his head. Thank you for confirming!