A medium-sized, long-tailed bird of forest canopy on Tablas, where it is the only drongo in range. Entirely black with glossy-blue wings, crown, and streaks on the neck and chest. Similar to Philippine Drongo-Cuckoo but larger, with a thicker bill and a strongly forked tail with upturned tips. Not as vocal as other drongos. Voice includes a grating scold followed by a loud, high-pitched whistle.