I have had good luck with running a radio at night in the coop. I also look the latches with a small padlock. We have one raccoon who tries to get our chickens all the time (I'm not going to lie, it's the cutest, fatest little thing ever) I know I can't kill it. I also know if you kill your current raccoons another will move it. You won't be able to rid your property of them. I lock my girls up promptly at twighlight. The couple times I have been late that fat old raccoon has been there. Luckily he hasn't killed any birds in a few months, the girls know what to do, and the fly the coop.