I have deer netting over the top of my pen for hawks, and thought I really had things secure on my large pen. In addition I lock them in at night. But in the evening before dark, a couple weeks ago, a racoon, apparently, climbed up a post and tore thru the deer netting and got one of my half grown Silver laced Wyandottes. Ate everything but the yellow feet and a few feathers. Two nites later he did the same thing again at another post, and got one of my silkies in the next pen over. I have 3 pens in a row, each about 15 ft by 25 ft, with a coop in each. So I got a roll of 2 ft wide chicken wire and nailed it along the top of the 2 X 6's that are around the top of my pen, and let the 2 ft wide wire lay over the deer netting. Nothing has gotten in since. He might still be able to get in, but he sure won't be able to tear out again, from climbing up a post and tearing out of the chicken wire. And I put out some Golden Marlin fly bait mixed with peach pealings, under the edge of a nearby shed where our outside cats go, and they were afraid to go under, so I thought he was probably there. A couple days later, cats are still fine,but a terrible stink coming from under the shed, so I think I got him!! But I was surprised the deer netting over the top let in a racoon. I thought they wouldn't try the wobbly netting, but I was wrong.