Look at all those nest holes! I refer to this tree as the condo. The bird activity in the area is continuous, and there are lots of wood chips on the ground. This Norway maple is slowly succumbing to wet rot. As branches die, we have them removed if they pose danger to people or property. Otherwise we leave them in place, although we sometimes cut them shorter, again, if they might cause danger. This branch was cut shorter in 2008 and has been continually inhabited at least since then, but there still must be vacancies.