ive only had the one outbreak of feather lice on my pigeons (a wonderful gift from the ducks to my parlors..), but using th DE diatomacious earth has seemed to work for that and i havent ever seen the feather lice anywere but on those birds, though did put out a vinager and slight dishsoap bath also and been using the DE in their food at two to four percent for their tiny bantam chicken size, as a wormer, dusted around in cage and offered as dust bath, and they seem to love it and feathers coming back great now. lluckily the chickens dont seem to have gotten the feather mites/lice yet at least though they all do go out together at times recent. Be sure when treating to get ESPECIALLY under each wing good and undersides even with sprays and washes, under tail. if you have scaley leg mites treat with vinager or vaseline to draw out those as well to be killed also, as mites can hide in and under scales and not be killed of supposedly.
yeah the two white silkie mixes were the bullies before feathering in, now the three games (found out that the two black are also OEGB hens as well as the BB red), seem to be ganging up on the big silkies and and going at their toe and neck/chest, and saddle feathers mostly now luckily.
think my mystery chick, is a lavender/cream D'uccle mix (maybe faverlle?), hen, as looking just like the cockerel (so cute when he crows now!) mille de fleur belguim D'uccle (or whatever whole long name is), as looks just like him now that catching up on feathering, except for color and longer lower thicker tail feathers so far. the mystery chick buddy bought week to month later that was de beaked is finally catching up and now named: bunson De beaker... lol yes just like the two muppets. I call the white silkie mixes the fraggles.
beautiful silkies by the way.