The campus tree swallow family successfully raised four young. Yesterday, we watched them leave the nest and fly around the green space outside the building. Adults were excitedly flying around them as they made a circle or two then flew up into a large oak.
I wonder that the tree swallows were "feeling" at the time.
At least in northeast Pennsylvania, tree swallows have a single brood. They fledge (leave the box) and are not seen again until next year.