When are ducklings old enough to be with adults?

[Kansaseq]

I've got 2 WH ducklings that are 3 weeks old, and about 1/3 of their adult size. I'm guessing I will have to keep them separate from the adults (and my chicken flock) until they are more grown. When do you guys usually turn them loose with the rest of the flock? Those suckers are messy!

 

[Eroc1_1]

I kinda had the same question. I have 6 that are 6 weeks old and 2 that are 3 weeks old. I keep them together in our duck house at night but separated by some welded wire. But I can still tell that the older ones want to peck at them when they mingle for a couple minutes on the lawn.

 

[KansasKid]

as soon as mine are feathered they get put in the big pen.