We are not sure what is wrong with our chickens. 2 have died. One died 10 days ago and one died this morning. We found the first one in her nesting box and appeared to have died sleeping. The second we found on her back dead on the floor of the coop this morning. She had seemed slightly sick yesterday - not moving much. Our egg production has been down slightly for the last couple of months. We thought maybe they were laying somewhere in the yard, but now wonder if they just have had an illness. We have four more chickens and three little boys who love them dearly. We do not want anymore to die, but are not sure what is wrong. Please advice. Thanks so Much!