A couple of days ago, one of my pullets started shaking her head, kind of like a horse whinnying, if that makes sense. It happens every couple of minutes. She is getting close to laying, and initially I thought she'd been pecked in the head as I could see where she'd been pecked near her beak. Then two more started doing it. They have mostly been in a cardboard box in our living room as for various reasons the new bigger coop kept hitting delays and took a lot longer to complete. In the meantime i would put them out on the grass in a baby yard with chicken wire over it to keep them from flying out and to keep hawks from getting them. Now they would spill some feed and I did see one wild bird go in there when the chickens weren't there, but normally I didn't see birds going into that area. However I do have two other hens that free range. I just went over to their coop and noticed that at least one of them is also doing the whinnying shake. Does this mean they all have mites? Also, the night before last (when I thought the other pullet had just been pecked) I moved them into the new coop with new pine shavings etc. Do I have to clean out the entire coop now? We just finished building it on Thursday. I was also going to move the two older hens in with the younger hens, but then thought I shouldn't mix them if they have mites...but if the head movement is mite related then it doesn't matter right? Also, just to make matters more interesting, in the last couple of weeks I have seen two things in my house that looks to my gardeners eye like spider mites (tiny red crawly things). I didn't think twice about it, since I have occasionally seen these types of bugs in my house (before chickens) usually running across the pages of a book I was reading, but it is very rare, and none of us have noticed any bites.But now I am concerned (or paranoid? ), since there have been vague horror stories on these forums of fowl mite infested homes (people, not chickens). So... if you've read this far, please let me know your thoughts - I think I am going to go get some Sevin dust and dose everyone, but would rather not if this is a normal chicken thing.