Brea, CA, United States
This juvenile was feeding its younger siblings! With a bug in its beak, it made several attempts at getting into the box (it seemed to have difficulty keeping its grip on the wood below the hole), while the three-day-old nestlings squeaked plaintively within. At last it got in, and emerged a moment later empty-beaked. About a week later, I saw it (or possibly another of the same brood) feeding the babies again.