A distinctive, heavy-billed black-and-white flycatcher-like songbird from the Kai Islands. Adult entirely black except for white lower chest and belly and white outer tail feathers. Juvenile gray-brown above and buffy below. Singles and pairs inhabit mangrove, forest, forest edge, and woodland in lowlands and low hills. Joins mixed-species flocks. Unmistakable in its limited range. Song is a single disyllabic whistle, “see-ooo,” descending in the latter half. Calls include a rasping, scolding “grrr-grrr-grrr…” and a weak, wavering chatter.