I am down to two (formerly 8) hens and a rooster. All the chickens seem to be dieing from different causes/exhibiting different symptoms. The chickens stay in a chicken tractor which has been kept moving around a big tree in the shade for the summer, and I currently use hay as bedding. My last two hens seem fine. I have had all since march. They are allowed to free range the yard from 3 pm to dark since we had issues with laying in the yard. We have noticed in recent months that Our Welsummer rooster has developed a strange crow (quieter and less frequent then ever before) and sometimes he makes a strange loud"wock wock" noise that we never heard before. Usually when he is separated from the two girls ...and doesn't seem to want to mate with the hens as often/ can be fended off from mating by hens easier. And even more recently we have noticed that he seems to have lost weight. Other than these things he seems to be behaving normally and passes all weekly health checks. Does anyone have any idea what if anything is happening to him?