I just discovered my chickens have lice. They are the little yellow crawly kind. What is the best way to get rid of them? What product do you suggest using? I see a lot of people say "Seven' but I have no idea what that is or where to find it. I have about 10 Silkies and 6 laying hens, plus four wyandottes in a different pen that also have lice. Ugh! Also, do lice not live as easily on Silkies? I never seem to see lice on them, just on the laying hens. Please please give me any suggestions you may have!