A chunky, dingy-looking, thick-billed songbird. Upperparts dark olive-brown, with a grayish head and a pale buff wash on the underparts. Note the pale bill with a dark tip. A rare species confined to canopy of tall, mature hill forest on Sangihe Island at sites where this habitat persists on ridges. Typically encountered in small groups or pairs. Most similar to Sangihe Golden-Bulbul, but Sangihe Whistler has a bicolored bill and lacks a yellow throat and face. Its loud song consists of around four repeated phrases. Also gives “churr” and sharp “wit” calls.