I have been reading through your posts for some clues to what could have happened to my hen as well. I did not notice any illness symptoms but found her dead below the perch this morning.
We do have tons of black widows here- can spider bites kill a chicken? I felt her to see if an egg could...
My chickens have a pretty bad case of mites. I removed the hay from the nesting boxes, pulled them to the sun, pressure washed the nesting boxes and dusted them with DE after they dried. I did the same for the coop (pressure washed w/soap and dusted with DE after it dried. I sprinked DE in...