So sorry for your losses but glad to here you are taking predators much more serious now.Last year a coyote broke the latch on my duck coop and ate/stole two of my three ducks. The remaining little guy was so traumatized, he was in total shock. The entire next day, he would not eat, drink, or hold his head up. The following day, he died. This is pretty convincing proof for me, at least, that ducks have emotions. And of course I had checked the little guy for wounds, but physically he was unattacked--not even a ruffled feather.
This year, I am using a system that is ten times stronger!! I do not think that ANY predator has a chance of getting inside. After the heartbreak of that episode, I take animal attacks very seriously.
Good luck!