My Quaker meeting is planning an outdoor amphitheatre made of stone. I want to make sure the design uses dry stone #masonry, without any mortar, in part because I understand this provides valuable habitat for #wildlife.
I'm having difficulty finding any resources on this subject targeted at the #USA, however; most sources mention European animals living in walls. I have no doubt the same principles apply in North America, but I'd like local details.
Could you suggest sources?