So Sorry for you losses. My birds all stay in their pens but they have nice large pens. I have electric wires around my coops and pens, concrete under the gates and good heavy duty netting covering all of the pens, all due to losses from predators in the past. I have free ranged in the past but no longer since my special bird was taken during the middle of the day by a fox. I did catch the fox and eliminated. I caught it in a live trap. SSS. I set a couple of live traps because I was also having issues with coyotes too. I have seen fox since but they haven't made an attempt to get to the birds. I have several game cameras on my property and now it's my belief that the adults teach the young that getting zapped by the electric wires isn't worth it for any chicken. I put the traps out under some cedar trees we planted many years ago. I baited the traps and let the fox take the bait for a few days then set the trap and caught the fox. As I said I have seen some since but they haven't been near the coops and pens. I have had in a couple of attempted digs under the fence on the far side of the pens but apparently the predator came in contact with the electric hot wires and aborted the attempts. Nothing has tried to dig under the fence since. Good luck...
This fox dug under a gate and killed several birds. I chased it off and it kept coming back. That is when I put the concrete under the gates. I also put a hot wire across the bottom of the gates. This bobcat dug under a fence and killed 14 birds. That's when the electric went up around all of the coops and pens. It made the mistake of coming back for another try. I don't enjoy eliminating them but when they keep coming back and killing my birds they have to go.
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This is another bobcat outside my chick/grow-out coop a little over two weeks ago.
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