Last night we got a call from a friend that there was a domesticated duck living on the front porch of a neighbor's home. She (I think a she) Has been there about a week, the family was feeding it bird seed while trying to find the owner, but nobody came forward so we picked it up tonight (the family wanted it gone). She looks thin and appears to be a female blue runner. We have five other ducks there are much larger. I would like to know if anyone has any advice on how to introduce them. We tried to just put her in with the others, but they started rubbing their heads all over her, then started pulling her feathers on her chest. We removed her and segregated them for now, there is chicken wire separating them so they can see and smell eachother. Any advice?