Over the last week, every time I go into the chicken coop, I'm covered with tiny, tan bugs. The chickens look fine and don't seem to be scratching a lot. But these things immediately get on my legs, arms and face/hair. It is creeping me out! I've spread DE on the wood chips and created a pool w sand, wood ash and DE but they don't seem to want to dust themselves. I won't keep them (5 mos old) if this keeps up. Any idea what would get on me but not them?