A few years back, I was out with Mrs. BA and we happened to see some gargoyle statuettes. I was surprised to find out she liked them (surprising people are the best people to know). Over the years I've picked up a couple, and one in particular we hung up outside the front door.
We like it there, and we're not the only ones. This young lady decided it would make a nice home:
She showed up last week, and within a few hours had built that nest. And she and her hubby -- common house finches -- didn't waste any time, either, laying eggs within a day or so.
This picture, taken by my brother in law Chris, is already out of date; just yesterday we saw that two of the eggs had hatched. I'm not sure of the third egg's status right now; at first she flew away every time we walked by (the gargoyle and nest are right next to our front door), but now she seems a lot more confident, and sticks around. We can't see inside the nest now, but I expect we'll be hearing from the chicks very soon.
I'm not inclined to disturb them. And I have some experience here.
[Update: I forgot to note that the quote "Surprising people are the best people to know" is from science fiction author Larry Niven. One of the truest things he's ever said.]