I'm still waiting to see what my straight run TSC ducklings will be and i can't find an age in my books. How old should they be before i'm sure of what they are? I'm starting to get excited that i might have actually gotten 5 out of 6 females which would just be the greatest luck ever for me. The little Rouen looks to have the curl above its tail but the 5 Crested's have no curls showing so far. They're about 3 months old now. Thanks for the help.