About a month ago, I noticed that our Birchen MGB was walking on his hocks. Of course I looked him over thinking he hurt himself, and that was the reason he wasn't walking. I couldn't find any broken bones or any indication that it hurt when I was checking him. I also noticed that he would fall over. Also, he has a lot of feather loss that I was attributing to moulting. I happened to check under his wings and saw these tiny group of black things. (I have never seen a mite, before). Anyway, I got on BYC and found that Sevin 5% dust would kill the mites. So, I immediately gave him some vitamins/electrolyte water and dusted him and all of our chickens with Sevin. (I think these came in from the load of dirt I brought in from the desert). We dusted the whole chicken coop and pens, also. We then repeated it again 7 days later. I have been checking them almost daily for these mites and all are clean. However, I noticed that this Birchen MGB kept picking at the feathers he has left, and is pulling out the start of new feathers. So, last night I got on BYC again and checked feather picking and mites kept popping up. So, my DS and I went out to the chicken pen last night and found roost mites on the chickens feet. Also, because the Birchen's wing feathers are so picked, he has not been able to get on the perch, but stays on the ground. He had probably 6 mites around and on his feet. We immediately got the Sevin 5% dust and went over all of the perches last night. I will be getting the Sevin spray to do the whole pen. I also found that painting the bottom of the roosts with used motor oil should help suffocate the mites. Does anyone have any other suggestions on how to get rid of these things? They are driving me nuts!!! Thanks!