For two mornings in a row I've opened the coop to find a headless Kahki Campbell duck under the nest boxes. Yesterday I plugged some vents with hardware cloth and blanketed the outside of the coop with traps. I baited a 4-way set with the duck carcasses under a barrell. That set did the trick. I found the culprit this morning. A MINK! (sadly departed ) So, lesson learned. Everybody likes ducks. We've had 3 ducks killed in 3 weeks. The other was killed by a Red-tailed hawk.