Mid-sized warbler with a long tail. Dark brown overall, with a white throat and pale eye-line. Found very locally in middle-elevation habitats with a dense ground cover, including bamboo, forest, marsh, and lush grassy areas. Rare species that is not often seen. Most likely to be detected and identified by its distinctive song: a ratcheting up-and-down “dee-ka dee-ka dee-ka…” series which can last for several seconds. Very similar to Evergreen-forest Warbler, and best distinguished by its different song.