I have these 3 silkie pullets (I think at least 1 of the black ones might be a cockerel) that have been together in this tractor since chicks. They don't roost but just huddle together in a box with bedding. can I introduce them into the main flock coop? Will they figure out how to roost? I even have some really low ones. It's just getting rainy now and they should probably get some better cover.