I'd like to put a bird house (below) into my back garden tree but am not sure what's the best way to do it. I've read opinions that affixing a birdhouse by hammering nails into it & into the tree might harm the three, as would tying rope around it (tight enough to hold the weight of the birdhouse).
Thus wrapping the birdhouse around the trunk or nailing it do not seem like good ideas. What else can I try? I could try hanging it from the tree but I don't know how stable that would be: the birdhouse that I bought does not have any add-ons to ease its attachment to the tree.