I have seen a little blood in a few poops in the coop. Not sure who it belongs to, but I know it is to my bigger chickens do to the fact that it's up on the high roosting bar. My chickens are 13 weeks, 10 weeks, & 5 weeks. They all seem healthy, no signs of any problems. They eat chick food have grit and fresh water. They don't free range right now but do have a run to be in. It has been raining here for about 4-5 days. Any ideas or suggestions??