We have had a heat lamp in the chicken coop since we've moved them outside. Now that the weather has warmed up, the heat lamp isn't on during the day....and if we don't turn it on before dusk, the chickens won't go back into the coop. It's as if they are scared of the dark. I thought they knew to go in and roost before it got dark. How do we train them do that....or do we have to get them a night light? We got home tonight and they were all huddled in a corner of the run and wouldn't go in until we turned the light on and physically chased them in.