I have lost some birds to fox during the middle of the day. They usually roam at night here. They will lurk and look for an opportunity and usually succeed. It will keep lurking looking for an opportunity. I no longer free range but have nice large pens for my birds. There is a lot of things you can do to entertain your birds even when in a pen but many people get enjoyment from watching their birds roam their yards. I also have electric wires around my coops and pens as well as good heavy duty netting covering my pens for protection from aerial predators, from which I have lost several birds in the past, as well as concrete under the gates due to a fox digging under a pen gate and killing several birds. I also have several game cameras up around on my property and most nights when the predators roam here see a predator on at least one of the cameras. This is also the time of the year when the kits that were born in the spring are now hunting on their own. Good luck...