Ok, so my chickens have feather lice. I have dusted with Seven before. Seven is usually highly recommended around here, and it did work. But it is kinda difficult and time-consuming. Then I considered Eprinex and other pour-ons, but they just seemed too dangerous; I just need something for the outside of the bird since I worm regularly. So, I decided to do a little research on topicals. At the vet clinic where I work we carry Mycodex Spray. It is 0.15% pyrethrin, and quite pricey for a smallish bottle. The doctor told me it is safe for birds, and we used it on a lice-infested dove with no ill-effects. And I mean I soaked that sucker because he was COVERED. And it smells pretty good too. Adams Flea and Tick Mist is 0.15% pyrethrin, and the other ingredients are also pretty much identical to Mycodex. Adams Plus Mist is 0.18% pyrethrin, and contains Nylar, an insect growth regulator (prevents babies from maturing and sterilizes adults). I'm guessing the "plus" is the extra 0.03% pyrethrin. My theory is, if chickens can tolerate inhaling and ingesting Seven, then we should have no problems with any of the sprays. I found a thread on here where the poster said she knew a breeder who sprayed topicals one of two ways: all over, gently wetting the feathers, or right on the skin in spots under the wings, back of the neck, and vent area. I read it is excellent for scaly leg mites. Has anyone else used any of the sprays for feather lice? Is there a withdrawal for eggs? I don't think that a withdrawal period is needed, but please chime in if you know otherwise! My chickens have literally a nest of lice over their vents, as well as throughout the body I am sure. I am going to get some of this spray tomorrow, and I will update on its effectiveness.