I would really llke to know more about that sensor. We're having the same problem here with predators and it seems I'm the only one that can ever see them and I am never near a gun. Those creatures are fast.I have to share this story with you. My neighbor's son just posted a picture on facebook of the THIRD coyote he had shot from his bedroom window.They live up the street from Lou Ann (and the chickens) and around the corner from me. Lou Ann immediately asked if it was the window at their house and was told yes. It seems that his dad set up a sensor in the field area behind the house. The coyote or fox (he has also gotten two fox) sets off the sensor, which then sets off an alarm and wakes up Brad. He gets up, opens the window and shoots the coyote or fox. Pretty amazing. I'm glad the chickens are locked up at night! Lou Ann is now going to be sure her cats are staying locked up, too. I'm even thinking of keeping the doggie door blocked so my dachshund can't get out.
This isn't that rural of an area. It's really more of a neighborhood, they just have a field area behind them where they had bought some extra land. So crazy!