While walking through this area, I heard singing before I even saw the bird. It turned out to be a Eurasian reed warbler, ...
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Sedge warbler sings loudly from reed stems

A sedge warbler perches on tall reed stems while actively singing, its beak open as sound carries across the wetland. By choosing an exposed position, the bird maximizes the reach of its vocal display ...
Old-World warblers, some 350 of them, seem to like wearing the same uniform – dusky olive brown, beige and grey -- which makes them a pain to identify ...