Thanks for a great article! As a newbie, I was wondering what the best nesting materials were. Your observations and conclusions make very good sense. I really appreciate you taking the time and sharing this information. I just put together a nestbox condo - 3 in a row - built with plywood. I think I’ll find some shallow containers (maybe dish pans) to fill with a piece of sod a few inches thick, and put one of these in each box. Mahalo for all your help!