Despite electric fencing and clipped wings, plenty of lovely stuff in the run and several mangy foxes about - a few of our hens insist on still escaping to free range. they do all come home in the evening (as it gets dusky and when the cockerel starts calling them back) however, if they didn't escape I wouldn't be encouraging them to as its more luck than good judgement that allows them to come back safely each night (not to mention having to go egg hunting when 'fox food' decides to lay under the pampas grass, under the goat shed, in the rabbit hutch...)