It is going down to 43 degrees here tonight. I have two hens in the coop right now. I'm thinking they'll be ok, right? What is too cold for them? They are both 18 weeks old. One is a Rhode Island Red and the other is a SL Wyandotte. Our EE is still at the vet recovering from leg surgery she needed after we saved her from a predator attack. She'll warm inside tonight at least. Thanks!