My chickens have lice. I've cleaned their coop and used DE and dusted them with DE and repeated the process, but they do free range over a fairly wide area and so I'm not sure where all they are getting the lice back, or if I'm leaving too many on the roost which is hard to clean, or what, but I don't see much improvement. I HAVE some Sevin but after reading the product label I'd rather use that as little as possible and don't want to dust the birds with this stuff. I have flea products designed for cats, Revolution ((selamectin) in cat doses 5-15 pounds. I also have Frontline plus (fipronil and methoprene) for cats. It seems so much easier to treat just the bird than the entire environment, has anyone used these for lice? These flea products seem much less toxic. I would love to hear about other options as well if someone has a natural method of getting rid of these lice. Thanks!