I have three 12 week old pullets, and am wondering if its ok to put them outside tonight. It is supposed to be a low of 40 tonight. I don't have a coop per se yet, they have a run and I have the brooder tupperware out there turned on its side with wood shavings in it, and it is out of the wind. I can grab them and put them in the garage if its not warm enough yet. Looking for expert advice. Thanks in advance.