I just happened to be looking out the window in time to see a bird clinging to the bird house and looking inside. Within a few seconds, I watched it go inside.
I made way to the computer room, where I had the camera hooked to a TV. I hit the power button and the audio came out immediately and I heard the bird inside. By the time the video faded in, the bird had left.
Later in the day, a wren moved in for the night.