ive read conflicting information as far as sexing juvenile Rouen ducks based on plumage and bill color. Can anyone more experienced tell anything by this photo? They're seven weeks old. I will also say they seem to have more raspy voices but are louder than my Pekin drake, so I'm not sure. My first ducklings I've raised. Also what is their growth rate supposed to be? They are quite a bit smaller than my year old Pekins. Thank you in advance!