Talk about ungrateful!
Provide a family of blackbirds food and lodging (they even recycled one of my tea bags from the compost heap for the nest…) in our clipped box tree for WEEKS on end and then they just sod off without a word of thanks.
Not even a tweet.
Not that they’re following me, of course.
Then again, who does…
Mainz Daily Photo 
That looks like a pretty clean nest; they may have flown the coop before the took up full residence.
Flighty.