We have a bob cat too. This is the second one. We had the first one trapped and taken off the property, then a few weeks later this one showed up. My hubs and his friends were on the hunt a couple weeks ago and shot at it with a pellet gun and all was quiet for two weeks. Last night it showed up again around midnight I heard the birds and ran outside. There it was sitting on a fallen tree staring into the coop getting ready. I yelled and threw rocks at it, which seemed to work till about 1am and it was back. Once again, I'm out in the yard in my Jammies armed with my iPhone and a handful of rocks. I scared it off again and was able to sleep through the rest of the night. I know it will keep coming back till we trap it again. No free ranging till this guy is caught. I have lost so many of my girls to these predators. I do not want to lose anymore.