I have a bunch of nesting boxes for small birds I am putting up. I am just wondering what is the best way to attach the boxes to various trees. I have seen screws used but I am not sure about that. I think it may damage the tree.
The biggest risk is to the lumber yard that cuts the tree for lumber; The steel nails and screws are bad for the cutting tools. My lot was formerly fenced with barb wire , trying to get the wire out where the tree has grown over it is a large problem . I have lost a number of hooks , etc, that I put in after the trees have overgrown them. It happens relatively fast ( at least for an old person ). This reminds me , I have some hammock hooks I need to check. I have read that a few copper nails / screws can kill a tree, but I never tried it.