They do stay inside depending on the temp, though and in kansas we can have winter were its all in the negatives or when the low is just above freezing its kansas the weather is very bipolar.....very......we can have all four seasons in one day i am not kidding, lol and we have two red pandas and we do want them to breed, but in my opinion i dont think they like each other like that, you know, lol. Other than that the animals all handle the winter very well, and they handle staying inside very well.