I have a black chicken that has been living on my property for about 6 months. There doesn't seem to be anything wrong with it and it just laid an egg in my flower garden the other day. However, I want to put it with my other 2. It has eaten lettuce through their fencing, bedded in their straw before I added it to the coop, and they have even pecked at each other from time to time. Should I put them together? or play it safe?