I knew the bluebirds were back and had been feeding their young. They were the first cavity nester to begin nesting in the meadow where I have several nest boxes. Later, the tree swallows appeared--in bigger numbers than I've had before...although the last two years, I've found their nests and eggs abandoned. I also had--what I thought was a Carolina wren. I'd seen a pair late this winter/early spring, so, when I saw a wren at a distance, I assumed it was the Carolina; however, it was a house wren. House wrens are notorious for piercing the eggs of other cavity nesters--and apparently open-nesting birds as well.
With that said, house wrens are native birds--I don't like their behavior, but I have welcomed nature to my yard. It appears that only two of my bluebirds brood survived to fledge. I always seem to miss them actually leaving the nest, but maybe some day I'll get it on video.
For now, here is the footage I got that shows the two babies getting fed by dad: