I have a BO that is 2 yrs old, her butt looks poopy and bare, as I looked closer there was little black bugs on her back. I was going to use some mite dust like I do every year, but these look like fleas. Bigger than a mite. The poopy, remindes me of baby chicks with poopy butt. I have never wormed or anything except for dusting for mites. All my chickens free range so maybe she ate something funny. Any help would be great!