Have you picked them up separately and walk away from the group? Sometimes that tell the tale.
As for integration keeping them close but separate is about the only way, do you have one that you think might be nice to the duckling? place him in with it see how that goes you might try rotating all through 1 at a time and see if that helps at all. Of course you don't want any of them picking on the lil one but a little shoving wouldn't be bad as long as lil one can stick up for it's self.
Awesome to hear lil one is doing so well too.
As for integration keeping them close but separate is about the only way, do you have one that you think might be nice to the duckling? place him in with it see how that goes you might try rotating all through 1 at a time and see if that helps at all. Of course you don't want any of them picking on the lil one but a little shoving wouldn't be bad as long as lil one can stick up for it's self.
Awesome to hear lil one is doing so well too.
