If you want to try to keep snakes out, cut a v in some 2 gallon water bottles, put in about a quarter full of water, moth balls, lavender essential oil, clove essential oil, and some eucalyptus, then put the tops back on. We usually have a yard full of snakes every summer;all kinds. But, after putting those bottles around my coop and around our yard we only had small baby snakes that were hiding in piles of leaves. I was sure we would get a few big ones but, none made it to our coop or inside the yard.