Feel your pain. We had the same thing happen here but no feral cats around here (coons would've eaten them too). We are adjacent to thousand acre wildlife preserve and have a creek behind our house which is likely the source. We had raccoons wipe out our covered pens of birds mid-day. They squeeze through small openings as if their body is jello. They are not just nocturnal like most people think. We trapped and killed one per night for 30 days and then gave up on chickens for 2 years after that. Now we have chickens again but use large steel greenhouse hoop frames 7 by 15 by 7 and cover in welded wire with half inch square openings from fencerwire, 16 gauge. Apron around bottom too. 16 inch Wheels added just when we move it. We have 6 of those and no problems so far. Free range for just an hour before dark while supervised, and in the morning before feeding if we have time. Knock on wood.
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