I feel like a failure as a chicken daddy at the moment. I've lost two chickens in the last month. Some history... A month ago my Barred Rock, Barbie, went free ranging in the afternoon, and we never saw her again. We figured it was most likely a predator, so I set a trap outside the coup in case they came back for more. About a week ago I caught an opossum, so I thought that was the culprit. Maybe it was, or maybe she just wandered off, laid down and died. We'll likely never know. That's the risk of free ranging. Well today we opened the coup, and our Buff Orpington, Buffy, just laid there and didn't move. Thought she was just dust bathing, but no. So I picked her up, and inspected her. No bulge in crop or anywhere else. (She had laid an egg today). I got her to drink about 20cc's of water from a straw, containing about 150mg of Amoxicillan. I made up a separate cage for her, let her rest, and came back to find her dead within hours. Yesterday she was completely normal, and begging for bread treats. I didn't know there was an illness that could kill so suddenly, but if there is, then that could be what happened to my other bird maybe. So my questions are: 1) Should I proactively put Amoxicillan/FishMox, in the water of the remaining birds, or is there a better antibiotic? 2) Could worms be to blame? 3) In general, what should I do going forward? Should I dissect her to check for worms or an impacted egg just to set my mind at ease?