Khaki campbells gender identification. 7 weeks

[Nessaberg]

Does anybody have a guess on gender of the khaki campbells. They are almost 7 weeks, they make more of a crackling sound not a true quack. The greenisg bill one like to peck at all the other ducks.

 

[Jenbirdee]

they should be quacking by now . looks like no curly tail feathers (yet) but those may show up over the next few weeks. My guess is the greenish bill one is a drake