I hope my final opinion on this is not offensive to the squeamish, but from my experience the best fix for this is, bait & eliminate! Usually during the night with a quality spotlight. Sooner or later, the critter population will depreciate.
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I’ve known of coons squeezing through extremely small holes & they will gnaw or tear their way in or out of most pens. I do recommend a couple of good game cameras mounted low & facing away from the chicken run. Living in southern LA it shouldn’t be hard to find someone who will come trap the...