I thought my pen was failsafe - a ten foot high solid wood fence around the coop, concrete pad with a wire mesh henhouse built on it. Now I"ve lost half my lovely chicks in a week. I inspected the perimeter of the fence on the ground, and no holes have been dug. Something is climbing the fence! The chicks are adults; some have head chewed off; a few were absolutely stripped to the bone (drought conditions may make things worse?), today I found the plywood back wall of the henhouse chewed through with two more dead chicks. Half the hens refused to come in to night and roosted in a magnolia instead, 20 feet off the ground. Don't blame 'em. I wired closed the hole that had been chewed and will entire wire the back wall of the henhouse, but here are my questions - you southerners, are these possums? I've lost some to possums before, but usually they don't eat as much. And - my MAIN QUESTION! A friend recommended electric wire fence, top and bottom. Anybody done this, how effective, any referral to a website giving tips? Thanks!!!!