A medium-sized greenish-gray bird with a black cap and a carrot-colored bill, endemic to the middle and high elevations of the mountains of Grand Comoro. Found in humid forest and in adjacent plantations and secondary areas. Often in small, noisy groups. Very similar in appearance to Madagascar Bulbul, and they overlap at moderate elevations, especially in degraded habitats. Grand Comoro Bulbul is separated by the slightly larger size, the olive tint to the plumage, especially on the back, the yellowish tint to the underparts, and the paler belly and undertail. Its song is an unmusical series of rattling and scraping notes, often given from a high perch, similar to Madagascar Bulbul’s, but slightly lower-pitched and more metallic.