On Wednesday I picked up my order at my local feed store. An EE & 2 Cochins. I have gotten other chicks from this store and they are all healthy. On the second day home one of the 3 new chicks, wasn't doing well. Wasn't eating. Just stood around peeping and started keeping her eyes shut & looking sickly. I took her back and exchanged her for another one yesterday. She was looking much better running around eating and acting "normal". Today she is only eating a little. Standing around and looking lethargic. There are 7 other chicks in with her and they are all fine, including the other Cochin that came out of the same bin at the store. Any ideas?