Horror of horrors, thought that concreting the bottom of my fence would cure the problem, woke up this morning when I fed the horses and ducks at 5:30 am 3 dead ducks in my pen, looks to be punctured on their face, went to work and came home on my lunch break and all is well, disposed of the bodies, got home from work at 8pm (yes i work long hours) and another dead duck and a missing duck, so i was out there by myself in the dark and holding a flashlight in my teeth catching my remaining ducks and throwing them inside the chicken coop door with them trying to get back outside, finally got them all inside the safe pen and in shock, have had this pen for a year with no problem and then all of a sudden all this predator activity in the past 2 weeks. Going to lock my Patterdale terrier rat killer inside the outside pen tonight and the next several nights, whatever it is; in for a rude awakening when they meet the terrier from hell. Additionally, will keep the ducks locked inside the building until I can get get some smaller diameter fencing. Not sure what the predator was to kill several and leave them laying inside the pen and then finally take one away. No evidence that anything was eaten on the killed birds, just some puncture marks on their heads. It seems like i just made it angry by concreting the bottom, so it couldn't easily drag one under the fence, so it went on a killing spree.
OH MY GOD that's HORRIBLE, were you able to track down the KILLER. OMG, What a horrible thing to wake up to see.