Hi my name is Meagan
I am a proud owner of (now 19) Pekin ducks 1 8 month old 3 4 week Olds and 15 2 week old I had 2 8 month old boys but sadly one was killed today and I need help introducing my other ducklings to my 8 month old please help
Welcome to BYC.
I do not have ducksbut I imagine you would integrate them the same as chickens.
You're going to need to set up a place where they can see, but not touch the 8 mo old and where he can see, but can't get to them. After a few days you can release them together and see how it goes. If it doesn't work, you give it another try.
Welcome to BYC! So sorry for the loss of one of your ducks. Do you know what killed him?
I would introduce them the way Janie has suggested. Separating where they can see each other but not touch, then after a week or so let them mingle together and monitor their behavior.