Marcia, I was telling my neighbor about your predator attack, and how you thought it was a bobcat. He thought for a minute and said "no, I don't think it's a bobcat. It sounds more like raccoons. Or dogs. Or a fox." A light bulb went off in my head, because you've mentioned having fox around your property this summer. If you've set traps it will be interesting to see what shows up. Keep us posted!
It could still be bobcat. I had one dig under a pen once before and kill 17 birds, and hauled off most of them. Took it 4 days to get hungry enough to come back. I still haven't caught anything in my traps but will keep trying. I hope it is not a fox because they are harder to trap. I've had fox around here for years, just never been seeing them until this year. Just scat and tracks before that. In 34 years living here, I have seen only one raccoon and it was a sickly looking beast which enriched my compost pile

I am torn between wiring up the base of the fence now or leaving it relatively undisturbed while I continue to set traps. My thinking is, if I put the wire skirt on now, I could put birds back in that pen, which could be more of an attractant for the critter to come back to that same spot. But on the other hand, the disturbance of the soil might make it more wary. I think I will try 2 more nights of baiting and work on the other areas that need shoring up in the meantime.