There’s a new bird family moving into the blackberry trellis box – House Wrens. To make sure I had identified them correctly, I played their calls on a phone app, and sure enough, they sang back to me. After the bluebirds moved on once their nest attempt failed (we suspect blue jays picked off the remaining living baby birds), I cleaned out the nest cup. Some bluebird enthusiasts advised leaving it in for a second round, some advised cleaning it…