I have 15 chickens and occasionally I find them picking at themselves, I picked up a couple and inspected around the base of the feathers and didn't see any bugs. They are about 9 or 10 weeks old and are I can see the new feathers they are getting. Do they itch when the new feathers are coming in??? Could this be all that is wrong? I did just put new hay in one side fo their tractor and dusted the whole thing with DE..I tried to dust them, but they wouldn't cooperate so that will have to wait till DH gets home to help. Thanks for any input.