We ARE wanting to add l white chicke to our flock of 3 rhode island red and l welsummer. I would like more but my husband wants to add pigeons also to them, and we do not want to over crowd them. Is it ok, to add just l white chicken, will it be safe? I added 2 zebras to my flock, watched them well, all was ok, but at night when I went to checxk again, the rirr crippled one, small one, was dead. I sumarized it was the new zebra, one of them, since it never happened before I added them, so now I AM AFRAID TO ADD ANY. What are yourn thoughts?