This experience is still difficult to believe, and without the anonymity of the internet, I do not speak of it.
We have a man-made Blue Bird house just to the outer edge of the yard where we could sit on the deck, watch and enjoy, without disturbing the residents.
When I mowed and edged around it, the parents would wait just a little ways off till I left before bringing food to the young ones, and often I would turn off the mower and talk to them, assuring them I meant no harm........Felt a little silly, maybe, but it seems they would cock their heads and comprehend.
One afternoon there was such a commotion at the back glass door by both parents, we stepped out to see what was going on. They flew back and forth between us and the birdhouse till I noticed old "Mr No Hips", starting to coil himself around the mounting post, heading for the babies.
I have zero patience with an unruly snake, and I dispatched him with a garden hoe. Seems old black snake could "dish it out", but he couldn't take it too well, when face to face with a sharp hoe.
While that pair, (I think) of birds had returned to the house several years in a row; after they got their younguns flying that year, they never returned.
I have taken the box down, cleaned and painted, and will put it back in a different location this spring........If "spring" ever gets here again.