My two blue silkies (still unknown gender) were doing this today. I thought one of them possibly laid an egg a 2 days ago, but this behavior looks like instinctual cock fighting or something ? They aren’t actually attacking each other yet, just like challenging I guess. What do you guys think ? Should I just keep a close eye on them, Separate them, Try to rehome one ? I don’t want them to kill each other. 
