I agree with @eddie_van_quailen , wild quail will definitely have different requirements than pen raised quail. Also, it's not wise to put chickens in with quail....even chicks that just hatch could have a disease that would affect the wild quail. I don't really know but I would suspect a respiratory infection.Might also explain why so many are failing to thrive, as wild-caught birds likely have slightly different needs/resistances than captive-bred. When I worked in wildlife rehab quail babies were some of the hardest to keep alive