Bought 8 new chickens at a sale, quarantined them for 30 days. Nothing appeared to be wrong and I noticed no symptoms to worry about. Turned them loose with the rest of my flock including a pair of peafowl. Went to the shed to open it this morning and one of my favorite girls was dead. I didn't notice anything wrong with her the day before. I have several chickens sneezing including my peacock- who just got his second eye feather. Mouths open. Otherwise they seem just fine. I'm just sick!!! What can I do?? Does anyone know what this could be?? I swear I will never buy someone else's birds when I don't know where they came from again!! Ugggggg...