A fox took a special bird during the middle of the day while I was out with her. I did get distracted for a moment and the fox grabbed her. I am still upset with myself that I didn't put her back in her pen. The fox did come back during the day and I caught it and eliminated it. I have seen more...
As I mentioned in my prior post, I do also have my pens covered with good heavy duty netting. I have a couple of coops my DH and a friend built that are open on one side and I had issues with an owl getting in and killing some birds. Problem solved. I don't close the pop doors on the coops but...
The birds are pretty well insulated with their feathers. If they touch the wires with un-feathered parts they may feel the zap. Check out the threads by @Howard E. He has a lot of good examples. Again good luck...
I have poly rope wires around my coops and pens. I have seen places where a predator has attempted to dig under a fence but once it came in contact with the electric wires it aborted the attempt. Most predators explore with their noses. I have the electric wires around my coops and pens good...