A friend of mine recently bought a barred rock hen and her 6 chicks. The chicks were a few weeks old (first wing feathers in). She had them a few days when the mom wanted nothing more to do with them. The chicks then started mysteriously dying one at a time. They will be fine with no visible symptoms and then maybe 6 to 8 hours before death they become very lethargic. Seeming to want to sleep standing up. They will still eat and drink on their own. No bloody stool and they are on chick saver. I took the remaining two chicks a few days ago and they were doing great. I am now down to one chick and it is appearing to sleep standing up. I fear it will be dead before morning. This is the same chick that was flying up to perch just this morning. Help?