I have 6 turkeys (three toms three hens) all from last year.....they've always slept outside on the fence posts in the field. we built them a nice shelter with roosts but they've always slept outside. thats been no problem until recently, its been raining hard in the day and freezing hard at night, every night the turkeys sit through the freeze and wake up in the mornings with there wet feathers frozen stiff. im guessing this cannot be healthy at all...but how do i convince the turkeys to use the shelter? they know its there.....they use it when the sun is blaring for shade.....but not now?