ducks are they male or female

[pinkado]

hello all, my 3 duckling are doing real well, and my god, how they grow so fast, well i noticed, there black beaks seems to be changing color, there caygau or something like that
there beaks seems to be like paling, becoming a dappled in odd white or near white marks
is this a sign on what sex they are or something worse

 

[duckyfromoz]

Bill colour will often change with a range of breeds as they grow. Nothing to be worried about in the majority if cases. In the darker breeds it doesnt indicte sex though at this age.

 

[Amiga]

I don't know much about cayuga coloring. My runners let me know by their quacks that they are all girls! Boys don't make the quack. They were about three weeks old when they first started getting their adult voices. They went from peep to honk to ah-ah-ah (it doesn't sound like quack to me).