We have foxes, yotes, raccoons, hawks, and cats. In 7? years we've lost 3 birds to predation. One decided she was gonna start staying out at night. Years later we lost two in one evening, a raccoon managed to push in a screen on the coop, coincidence or not the horses happened to be away when the raccoons got bold. The coop is between the house and the horse dry lot.
6a-3p they have a covered dog run plus area under coop. 3 - 30/40 minutes past sunset they free range, they wander about a hundred yard radius. They will jack up mulch, gravel, flower beds, anything they can dig. Have noticed no drop in insects, observation is they love near microscopic ants most. They're hell on snakes too.