@MServant they have a basic home-made house, but they don't use it yet, the weather was good enough this far (but as we all know; winter is coming... :D ). We don't plan to keep them because of the dogs and the traffic. It's hard to give them to (actually very nice) people, but I'm sure, that...
Yes, their are mine :) My favorite is the one that walks on the high part of the drier, and gets stuck in for a moment :D
Thank you for your help with the youtube link!