We started out with 6 chicks in march and once they were old enough to tell we found out one was a rooster so we found a new home for it. Then we had 5. 2 nights ago one was found dead, no wounds at all, but it was in the 90's and we think it might have died from the heat? Now we have 4 chickens left. They are 5 month old and we would like to add 4 more chickens of approx the same age. We do not have any means of keeping them separate and letting them get used to each other, will they fight if we just introduce them? Would it be better not to get new birds?