I just now introduced my 6 week old Runner Ducklings and my 4 week old Mallard Ducklings to the rest of my flock. They have been in the large pen with the others but sectioned off since either birth or 3 days old for the Runners. Everything is going well. My other ducks are anywhere from 6 years to as young as a year old. I have 9 of the other ducks that I put them in with. All of my Drakes are in drake jail as I do not want the young ones to be mated and hurt. I sat and watched them while they were all out together in the dog pen where there is grass for them for quite a while and saw no problem. The rest of my flock has always been very easy to add ducks to, I have added some with no introduction at all and had no problems with them. I will keep a close eye out the rest of the day. My pen is very large with lots of places they can hide if there is a problem. I think a lot of it has to do with space available for them and the personality of your other ducks. My Mallard ducklings are all feathered out and the odd ball Black Swedish Call is too that hatched out with them. It is smaller but they were used to Call Drakes being with them before they went to jail for trying to mate the Hens, three of them to one!!! Bad Boys!!! Then they wonder why I call them my Mafia Drakes!! LOLQuestion...
When introducing pullets to laying hens things seem to calm down once the pullets become layers. Is it the same for ducks intro with ducklings?