Fox are a daytime predator. They also hunt at night but they definitely hunt during the day.I will have dogs to guard at night. guineas will be somewhere at the far corner of the 2 acre property and separated from the chickens. I hope they will wake up the dogs at daytime and scare off any fox that dares to come from that side at daytime. there are hundreds of acres with olives surrounding the plot so I don't know if there are foxes at daytime.