Yellow-rumped Warbler: York County, Maine, USA, October 2023 — The other, and more expected, warbler in the young birches on the sand plain was, of course, the Yellow-rumped Warbler. Yellow-rumps come early and stay late, and are undoubtedly the most common warbler in southern Maine. Though you might think they are looking up to spot danger…they are actually looking for insects on the underside of the birch leaves. 🙂 OM Systems OM-1 with ED 100-400mm zoom at 468mm. Program mode with my custom birds and wildlife modifications. Processed in Pixomator Pro.