Over the last week the young bluebirds have been much more curious about what lies outside of the birdhouse. Even as we sat on the deck, within 6 or so feet of the box, they would hang their heads out of the box to check us out. Today they seemed more interested in the cardinals, catbirds, and other birds eating suet nearby, and before long one was standing in the entrance, thinking about flying off.
All three ended up leaving within a few hours. The first two I watched, but the last one was shy (leading to the nickname Shy-a la Bird, which is probably not funny to anyone other than me), so I set up the camera and left him alone.
The video quality impressed me as it was zoomed to the max and resting against a dirty window about 8′ from the bird house.
Good luck blue birds!
February 20, 2018 Update! The blue bird family returned a few days ago and have been rebuilding the nest for spring!