Can you tell sex?

[Garciaaxen]

Hello, I had 3 Rouen ducklings(2 female, 1 male) & unfortunately today 1 of them was killed. I cannot tell if the male or 1 of the females passed away so I was wondering if anybody could take a guess on the sex of my 2 Rouens that are still alive. They are about 3 weeks old.

 

[Miss Lydia]

I am very sorry you lost one of your Rouens. What happened? As for telling sex they are still too young. Although you may start to hear voice changes in the next 2 to 3 weeks. Until the drake gets his drake feather usually around 12 weeks voice is about the only way to tell drake from duck. You'll begin to hear a soft quack every once in a while from a female until she gets her full on quack which with my Runners was around 5 weeks old. Drakes will have a raspy voice when older.