My silkies live in an aviary and I have tarps around the open sides at night to keep them warm, they have woodshavings and hay on the floor and a roosting box but I kept worrying they would be cold when winter arrived. After reading this forum I decided to buy them a small dog kennel and put that in there for them. I am so excited! I found a new secondhand plastic one with an opening at one end and ventilation at the other, lined it with newspaper, shavings and hay and put the three of them in there in the aviary and they love it! They all sleep together and its so cute! I would simply have not thought of it but for this forum, so thank you very much!