A few days ago a friend sent me the link to a live webcam trained on the nest of an Allen's hummingbird they've dubbed "Phoebe".
According to the website, Phoebe has possibly been coming back to the same spot in Southern California every year since 2007 (they are not absolutely, positively sure it's the same hummingbird, but they think so). She has four nests in a rosebush, and she chooses among them every year, sprucing up the one she chooses with more dryer lint and cobwebs, which is pretty much what hummingbirds make their nests out of because wouldn't you, if you were a tiny fairy bird?
And for another example:
The cobwebs make the nest stretchy and easy to fix as the growing chicks squirm around trying to find a more comfortable spot. Phoebe feeds her babies flower nectar and bugs, which she regurgitates into what the website calls "a kind of buggy stew".
UPDATE: Both hummer babies have fledged, but Phoebe's not done for the season. She's got one if not two more rounds to go. Check back in periodically.