Hi I'm building a new 25x25 run for my flock. My plan is to have a 4 foot high wire fence with an apron, and then have aviary netting for a roof, held up with a high pole in the center to give a tent effect. The only predator I'm worried about is red fox. I'm sure a fox could get through aviary netting, but not if its 4 feet off the ground, right? Will this setup keep a fox out? The chickens will be locked up at night. Thanks for the input!