My husband and I started with a large flock of chickens a year ago but are now down to only 5. We built a great coop for them in one of our outbuildings and for 8 months or so they came in every day at dusk and we closed the door to keep predators out. We keep their food and water in the coop. Over the past five months the chickens started preferring to roost in our nearby horse barn and no longer return to the coop in the evening where we can keep them safe from predators. We want them to be free range chickens and not confined to a specific area during the day. Any suggestions how we can re-train them to come back to the coop at night?