Probably a dumb question. But we started out with 8 in March and 4 have died. I dont know whether it was from cocci or Mareks. So far the remaining 4 seem very lively. We have a 12 x 12 very nice coop we just finished and that same size run. I would like to get at least 4 more chickens and then maybe next year in the spring get some more babies. We are in North Texas with days getting to 100 right now. So first of all, what is a more heat tolerant chick than the RIR's that I have now. And also, is there any breed that has less sickness than others. Probably not but its a thought.