Ive witnesed a coon go thru an intire chicken at the same speed of butter in a microwave. It wouldnt take long. Believe me, they have small mouths but are FAST eaters, they have to be other wise other predators get their kill.Firestrike and Narnia,
Kill a single bird by decapitation when preparing to eat. Note how long body flops. For present, note how much of bird in coop is missing. Consider how long it took raccoon to do that. Those two pieces of information will force rethink. For fun, place a live-trap in coop using one of the carcasses as bait tonight. I bet you will catch a coon even with door closed!