Fairly small, slim cuckooshrike in which males and females are strikingly different. Males have dark gray upperparts, pale gray underparts, and black wings and tail. Females have brown upperparts, a whitish throat, and otherwise rufous underparts. Both sexes have pale marks at the tip of the tail. The juvenile is a drastically different-looking brownish bird with strong wing bars and unmarked buff underparts. Rare and local in remnant patches of humid forest on the island of Mauritius. The song is a quick, slightly accelerating series of nasal whistles. Within its small range, most similar to Mauritius Bulbul, but easily separated by many details, including the lack of an orange bill.