Chicken wire only keeps chickens in. It doesn't keep anything out. If he died during the night it was a predator.Yes they are still on medicated chick starter. He wasn’t thin, he seemed to be a good weight for 10 weeks old. I don’t believe he had an old wound. I have chicken wire completely covering their outside run, and the chicken wire is zip tied together and zip tied to the chain link pen. I don’t believe another animal got in there, surely the animal would’ve killed more than just him? The only thing I saw on him was feathers had been plucked below his neck on his back. My coop is 8’x8’ and I have 35 birds in there now. I would think that’s enough room?
And 8x8 for that many birds isn't enough.