I have a small flock of 5 hens - SLW, Leghorn, Blue Cochin, RSL, Salmon Faverolle - and the last three are losing feathers on their necks. I did keep them confined to their coop all of last week and we had a drop in temperature (as did everyone else) recently to about 50's from typical 80+. Other than that, they've been laying well, eating, acting normal. I haven't seen any of them fighting and am not sure if they have lice or not. Here are some pix I just took. Any ideas are appreciated. Thanks!