I forgot to write any more about our birds. They have long since grown up and flown away, leaving only an empty nest and a scattering of crap on the landing. I could probably turn this into a metaphor for human children, but considering how many boxes of stuff I have left in my parents' attic, it would cause a bit too much guilty queasiness.
The babies were much quieter than I expected. Each time we walked by - morning, lunchtime, and after work - they were silent. Whenever I looked in, they just sat there, usually sleeping. This pic is from a month ago:
Can you see two fuzzy little heads, and a third obscured? About two weeks after that, I spotted them perching out on the plants and the railing, looking essentially fully fledged. That weekend we overheard our neighbor saying they had flown away.