We found bird lice on our chickens in July when we were bathing them for the fair. Ugh. I've dusted the birds and the coops with Sevin, bombed the coops with pyrethrin, cleaned the coop with bleach and blue dawn. Dusted the coop with Sevin and DE. I've performed this routine twice since I initially found the lice. I did a spot inspection on two birds yesterday and they still have some lice eggs crusted on the feathers around their vents. Sigh. The bright spot is I didn't see lice crawling. My question to the forum is could my birds still have lice? Is it possible to have killed the bugs and the eggs but the eggs to still remain attached to the feathers? If so will the egg clusters eventually fall off? A couple of notes - We had a VERY wet spring and early summer in Missouri. My birds have sand in their run but are allowed to free range every day. I believe they weren't able to dust bathe as usually because everything was so wet. My husband likes to put grass clippings in the coop along with the pine shavings I always use. We have a purple martin house in the yard and keep bird feeders out during the winter. Could the grass clippings be a source of lice? Can lice live in the compost pile where I deposit the removed bedding? The chickens like to scratch in it. Sorry so many questions. I'm getting frustrated and want to do the right thing to keep my chickens healthy. Thanks in advance for any and all advice!!!