Birdhouses make lovely additions to a yard or garden. They can be aesthetically pleasing and, depending on the type and placement of the birdhouse, can attract a variety of different birds. While the primary consideration when putting up a birdhouse is the birds, there are a few other organisms you should consider, too.
https://www.mnn.com/earth-matters/animals/stories/how-hang-birdhouse-without-harming-tree