male or female

[kychickguy]

how do u tell the different between the male and females. I got 2 ducks from tractor supply as baby and my wife wants to no
if what they are

 

[TLWR]

At this point you wait. Many ducks can't be sexed by color and if you have one that can't, you wait.
At around a couple of months old, the girls start getting their quack on and the boys will be raspy.
Then eventually the girls will pop out eggs and the boys will get their curl feather on their tail.