This fella was inspecting a potential nesting site. I could hear it tapping on the inside walls, and briefly peeking out here and then.
Canon 7DII + 500mm f/4 II + 1.4TC III, manual exposure, evaluative metering, 1/640s., f/5.6, ISO 800, natural light, handheld, FF, a few spot cleanings on the tree, and toned down the very brightest parts on it (along the right edge).