I have a 6 wk old RIR, a 5 wk old Dark Brahma, a 5 wk old salmon faverolle and a 4 or 5 wk (not sure) old light sussex. About a week and a half ago we moved the brooder into the garage and the chicks had to deal with much lower temperatures, they all handled it well except the SF was especially puffed up and obviously chilled for the first few days. This also seemed to cause her to stunt a bit in relation to the rest of them. She continued to feather out nicely but didn't grow much. She is now on her way to catching up, spending much more time eating and less time under the heat lamp, and just generally seeming more comfortable. Starting about 5 days ago I have found 4 flight feathers (or what appear to be flight feathers), all from the SF, around the brooder. I have never found any other feathers in the brooder since we got them. She looks fine, I have not inspected for mites but have no idea how they could have got them. She is starting to go through the chickasaurus stage so it is somewhat tricky to tell if the others or one of the others is plucking out other feathers or if it's just from that natural awkward stage (you know, when they feather around the head and neck and look super goofy and mangy). All of the chicks get along very well, especially the RIR, DB and SF whom we've had for a month. We just got the sussex a week ago and she has done well, but definitely has some bullying tendencies, though they are normally ignored by the others and the RIR is definitely still ruling the brooder. But, if anyone is the culprit of the lost feathers I would suspect the sussex. What do you think? Is this a problem, or is there a normal explanation? Thanks!