Living in Michigan, we have had cold and blustery days. The 'kids' (6 mths old) did venture out a couple of times in the run after a few days cooped up inside. Yesterday though, a handful of them refused to go back into the coop at dark, even though for the past couple of months this was their norm to go in when the light came on inside. Again tonight, we had to go out and coax 1/2 of them back into the coop clearly under protest. Is this a normal thing? Are we missing something?