I've got one, her male companion was killed by a hawk/eagle in September. I still have a male pekin and rouen and 2 female rouens and everyone seems to get alone well but I want more runners. So I'm debating, 3? 4? or 5? I'm hoping eventually, once they're all the same size the 2 flocks will merge. Possibly I'll lose 1 or 2 to predators, like last year, so I was thinking 5. But realistically, 3 seems like it might merge better into the group. But what do I know? I just want everyone to be happy and I don't want my poor runner left in the lurch because the new guys just want to be by themselves. I think I'm over-thinking this.