For a LONG time now, my chickens have been sporting damaged feathers, wings and base-of-the-tail feathers especially. I've wormed them, treated them for mites/lice, and cleaned out the coop, scrubbed it down, and added new shavings and DE. Some of my chickens look really good, shiny, soft feathers and great weight. Others...not so much. This morning I freaked out for a second because one of my gold stars is missing a clump of feathers and it is all black...upon further inspection, the blackness is from her getting pooped on. However, there IS a clump of feathers missing. They look chewed off, and it is right at the base of the tail. She is acting fine. WHAT ON EARTH could be ruining my chickens feathers?!?!?!?!?