A family of House Wrens are frequenting a nest box along a bluebird nest box trail, as is often the case. Instead of having them land directly on the box before going in I fastened a perch close to the entrance. They immediately accept it and use it, as is also usually the case.
Canon 7D + 500mm f/4 II + 1.4TC, manual exposure, evaluative metering, 1/500s., f/5.6, ISO 800, natural light, handheld, about 85% FF, "greened up" the BG that was yellower in the raw file than in the field.