Sexing Khaki Campbell ducklings

[Sachasmom]

I have three left in my order from Holderreads, does anyone know if you can tell sex by bill/feet color?

I have two with dark bills and dark feet, one with a lighter color bill and feet. Their body colors are the same tho.

They're about three weeks old now.

 

[AnaD]

I found that my boys have a slightly lighter bill than the females. But it is easier to tell when they start to quack to know for sure.