I have a small flock of chickens about 8 different types. Since Sept. I have had a chicken die on me every other week. When I pick them up they are very light feels like nothing but bones and feathers. I have checked for lice/mites and they are clean. I have dewormed them with medicine about 2 weeks ago and cleaned the coop thought everything was fine. I now have a chicken about 6 months old that is laying down and not eating or drinking. I have also checked her crop for souring or blockage and she has nothing there. My girls are in 4-H and I don't know what to do next. I also have silkies that are next to the coop in the barn and none of the silkies are sick. Can someone please let me know what else to do, I have read and checked everything I could think of. Thank you in advance.