So I recently came home and found out at least 1 of my hens has lice... I'm going to go examine my other pens and birds from my main/ laying flock to see who has it. I am extremely frustrated because I had just treated them all for lice about 3 months ago . Sprayed their bedding, replaced the bedding, sprayed the walls, replaced the layer boxes with metal ones, sprayed the entire coop, you name it I did it. Even put out diatamatious earth out for them (which they refused to use). Most of the chicks look great with fluffy feathers except for 3 which I haven't even caught yet to check. They were the ones that got me suspicious. I had treated everyone with Permethrin 10 spraying each individual hen all over. I was sure I got every single lice. Apparently not... The only new birds I had introduced were a few days ago which I had quarantined for 2.5 weeks. They haven't even mingled with my main flock yet and I checked them head to toe for lice and they didn't have it. They also haven't been here long enough to infect any one even if they had it. I had read articles saying that wild birds can bring in lice. Would finches and pigeons carry it? Also I have free roaming guineas could they be the culprits? I am at my wits end because I have no idea where the lice is coming from!!! Is there a particular area they are found in? Is there a plant or food I can give the chickens to help prevent it? I'm half tempted to put flea collars on them! Any help would be greatly appreciated.