I picked up 3 new black female Runner Ducks today! I had 1 male and 2 females already. I took the advice of folks on here and added a separate area for the new ducks beside the others. I'm lucky enough to have a garden shed I emptied and added a pool with hay for a shelter for the new ones for now. As soon as they seem comfortable with each other I'll move the new ones in with the others. How long do you think that could take? A week? Longer? What should I watch for to know they're OK with each other?