Originally I didn't have quite enough netting so I bought some online but it wasn't what I thought it was but put it up anyway. I thought it would still be a deterrent to aerial predators. Wrong. An owl went through the crappy netting and killed some birds three times. Each time I put a new piece of the crappy netting and the owl would go through it. I move the birds to another coop and put a camera up in the pen. The owl went through the netting again. I had ordered some good netting and replaced the crappy netting. The owl tried again but this time got caught in the netting. We managed to get it out into a cage and a wildlife rescue came and got it.