All but two of my chickens roost on the outside roosts instead of inside the hen house. It's now reaching below 0 at night. Are they smart enough to go inside if it's too cold? I'm worried about frost bite.... I've tried moving them inside. Sometimes they'll stay put, and other times, they just choose to go back outside. The hen house roost is actually higher than the roost outside, so I'm not sure why they prefer the outdoor roosts. My coop is based on the Garden coop design. Should I try to keep moving them inside or just trust that they know what's good for them? Thanks in advance for the advice!