They're 2 weeks old, warm and squirmy. But they're starting to burrow and push all the hay out of the box (small cat carrier). I was thinking it's time to move them into a bigger box, problem is I don't have one that has a top on it so it will be open top but much deeper and have more hay in it and fur. Forgot to add they live in my chicken coop, They have their own run and cage and mama gets to free range in the whole coop and in the big run. I honestly wouldn't have any hesitation if it were warmer here in Ohio.