Would strongly caution you about keeping these chicks. Please read up on diseases and chickens...they could be carries if they survive and infect the rest of your birds...once they get the disease...I think it mareks? They always have it and pass it on though nasal secretions and eggs...very tough but I would give them back to the guy you got them from and whatever...sometimes this disease doesn't show up until the chicken gets stressed, and they seem old enough to fight it-i'm just really concerned for your other birds.I