I've been fortunate to find many active nests this year, and have had many good opportunities with the adult birds coming in with food. Here's another, a bonus natural cavity House Wren nest. I never did see the young fledge, but an acquaintance of mine witnessed six of them leave the nest a couple of days after this was taken.
Canon 7DII + 500mm f/4 II, manual exposure, evaluative metering, 1/320s., f/4, ISO 1600, natural light, handheld, about 80% FF, toned down the birch bark via burn tool. In hindsight I should have blended away the BG line near the tail...