I have a rooster in my garage because he is being treated for wry neck. There are very very tiny black bugs all over the wood and food holder. when I put my hand near the cage they are all over my hand. I can't find any on the rooster and his feathers are fine but i sprayed him and everything with Manna pro poultry spray. Two days later they are back. Since they are not on the chicken could they be something else besides mites?