They are locked up in a large fenced area. Fence is 8' tall hardware cloth and buried 12". There is a coop inside the fenced area where most chickens roost at night but my ducks and a couple chickens roost under the coop inside the fenced area. Birds are picked off one Per night and partially eaten left at the kill spot. Last night we put partially eaten duck in live trap. Live trap didn't go off but duck was pulled out and eaten completely except the spine. 4 of my chickens were inside the fenced area under the coop with this critter and were unharmed. It's climbing the fence. We've gone 4 years without any problems and now it's each night. I'm in Oregon so my top thoughts are raccoon, possum? Any thoughts?