When I had my first infestation I sprayed the birds. Now I don't worry about it because since I am spraying everywhere I really don't need to spray the birds and the dust in the nest boxes I think helps. A couple of years ago I thought some birds were molting. When they weren't getting their feather back, I checked them and discovered they had mites. I originally bathed the more infested birds which did help. I sprayed the birds and the coops thoroughly for a month of weekly spraying. Eventually the birds got their feathers back in and were beautiful again. Recently I noticed some birds molting, I checked them over and found nothing. I am doing a serious cleaning of all of the coops and will do a weekly spraying for about a month because we have had warmer the usual weather and the wild birds are flying around the coops and pens. Everything will be fresh and clean and sprayed. It also keeps flies away.