This is the second summer I've lost a chicken to what I believe is heat stroke. I have a 30 foot fenced in area and thought I have provided enough areas that have shade. This summer I have put a huge tarp with poles to widen an area for shade. There is constant water supplied in a tube feeder and monitored 2x/day. I also have other areas that provide cover for shade. I live in PA and it has been hot the last two weeks. Is loosing chickens in the summer common? Assuming it is the heat, what else can I do to prevent this is issue? I only have four chickens so there is space and always plenty of food (I probably over feed my birds). I do bring a variety of scraps to them but they are always on the approved list. Are chickens fragile birds and even in a well kept environment is loosing birds part of the experience? Thanks!